Fix transfer errors, save raw data

TempTrack.xcodeproj/project.pbxproj

@@ -23,18 +23,13 @@
 		88CDE0512A2508E900114294 /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE0502A2508E900114294 /* ContentView.swift */; };
 		88CDE0532A2508EA00114294 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 88CDE0522A2508EA00114294 /* Assets.xcassets */; };
 		88CDE0562A2508EA00114294 /* Preview Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 88CDE0552A2508EA00114294 /* Preview Assets.xcassets */; };
-		88CDE05D2A250F3C00114294 /* DeviceManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE05C2A250F3C00114294 /* DeviceManager.swift */; };
-		88CDE05F2A250F5200114294 /* DeviceState.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE05E2A250F5200114294 /* DeviceState.swift */; };
-		88CDE0612A25108100114294 /* BluetoothClient.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE0602A25108100114294 /* BluetoothClient.swift */; };
 		88CDE0632A253AD900114294 /* TemperatureDataTransfer.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE0622A253AD900114294 /* TemperatureDataTransfer.swift */; };
 		88CDE0662A25D08F00114294 /* SFSafeSymbols in Frameworks */ = {isa = PBXBuildFile; productRef = 88CDE0652A25D08F00114294 /* SFSafeSymbols */; };
 		88CDE0682A2698B400114294 /* PersistentStorage.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE0672A2698B400114294 /* PersistentStorage.swift */; };
 		88CDE06D2A28A92000114294 /* DeviceInfo.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE06C2A28A92000114294 /* DeviceInfo.swift */; };
 		88CDE0702A28AEA300114294 /* TemperatureMeasurement.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE06F2A28AEA300114294 /* TemperatureMeasurement.swift */; };
-		88CDE0742A28AEE500114294 /* DeviceManagerDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE0732A28AEE500114294 /* DeviceManagerDelegate.swift */; };
 		88CDE0762A28AF0900114294 /* TemperatureValue.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE0752A28AF0900114294 /* TemperatureValue.swift */; };
 		88CDE0782A28AF2C00114294 /* TemperatureSensor.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE0772A28AF2C00114294 /* TemperatureSensor.swift */; };
-		88CDE07B2A28AF5100114294 /* BluetoothRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE07A2A28AF5100114294 /* BluetoothRequest.swift */; };
 		88CDE07E2A28AFF400114294 /* DeviceInfoView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE07D2A28AFF400114294 /* DeviceInfoView.swift */; };
 		E253A9222A2B39B700EC6B28 /* Color+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = E253A9212A2B39B700EC6B28 /* Color+Extensions.swift */; };
 		E253A9242A2B462500EC6B28 /* TemperatureHistoryChart.swift in Sources */ = {isa = PBXBuildFile; fileRef = E253A9232A2B462500EC6B28 /* TemperatureHistoryChart.swift */; };
@@ -45,7 +40,6 @@
 		E2A554012A3A6403005204C3 /* DeviceTime.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2A554002A3A6403005204C3 /* DeviceTime.swift */; };
 		E2A554052A4ADA93005204C3 /* TransferView.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2A554042A4ADA93005204C3 /* TransferView.swift */; };
 		E2A554072A4ADB9C005204C3 /* TemperatureDataTransferDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2A554062A4ADB9C005204C3 /* TemperatureDataTransferDelegate.swift */; };
-		E2A554092A4ADCC9005204C3 /* DeviceConnection.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2A554082A4ADCC9005204C3 /* DeviceConnection.swift */; };
 		E2A5540C2A4ADFC6005204C3 /* DeviceInfoRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2A5540B2A4ADFC6005204C3 /* DeviceInfoRequest.swift */; };
 		E2A5540E2A4C9C4C005204C3 /* BluetoothRequestType.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2A5540D2A4C9C4C005204C3 /* BluetoothRequestType.swift */; };
 		E2A554102A4C9C68005204C3 /* DeviceRequest.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2A5540F2A4C9C68005204C3 /* DeviceRequest.swift */; };
@@ -54,6 +48,7 @@
 		E2E69B602A4CD48F00C6035E /* IconAndTextView.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2E69B5F2A4CD48F00C6035E /* IconAndTextView.swift */; };
 		E2E69B622A4D7C3100C6035E /* BluetoothScanner.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2E69B612A4D7C3100C6035E /* BluetoothScanner.swift */; };
 		E2E69B662A4DA48B00C6035E /* BluetoothDevice.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2E69B652A4DA48B00C6035E /* BluetoothDevice.swift */; };
+		E2E69B682A529FA800C6035E /* TransferHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2E69B672A529FA800C6035E /* TransferHandler.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -73,17 +68,12 @@
 		88CDE0502A2508E900114294 /* ContentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
 		88CDE0522A2508EA00114294 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		88CDE0552A2508EA00114294 /* Preview Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = "Preview Assets.xcassets"; sourceTree = "<group>"; };
-		88CDE05C2A250F3C00114294 /* DeviceManager.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = DeviceManager.swift; sourceTree = "<group>"; };
-		88CDE05E2A250F5200114294 /* DeviceState.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = DeviceState.swift; sourceTree = "<group>"; };
-		88CDE0602A25108100114294 /* BluetoothClient.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BluetoothClient.swift; sourceTree = "<group>"; };
 		88CDE0622A253AD900114294 /* TemperatureDataTransfer.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemperatureDataTransfer.swift; sourceTree = "<group>"; };
 		88CDE0672A2698B400114294 /* PersistentStorage.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PersistentStorage.swift; sourceTree = "<group>"; };
 		88CDE06C2A28A92000114294 /* DeviceInfo.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DeviceInfo.swift; sourceTree = "<group>"; };
 		88CDE06F2A28AEA300114294 /* TemperatureMeasurement.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemperatureMeasurement.swift; sourceTree = "<group>"; };
-		88CDE0732A28AEE500114294 /* DeviceManagerDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DeviceManagerDelegate.swift; sourceTree = "<group>"; };
 		88CDE0752A28AF0900114294 /* TemperatureValue.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemperatureValue.swift; sourceTree = "<group>"; };
 		88CDE0772A28AF2C00114294 /* TemperatureSensor.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemperatureSensor.swift; sourceTree = "<group>"; };
-		88CDE07A2A28AF5100114294 /* BluetoothRequest.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BluetoothRequest.swift; sourceTree = "<group>"; };
 		88CDE07D2A28AFF400114294 /* DeviceInfoView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DeviceInfoView.swift; sourceTree = "<group>"; };
 		E253A9212A2B39B700EC6B28 /* Color+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Color+Extensions.swift"; sourceTree = "<group>"; };
 		E253A9232A2B462500EC6B28 /* TemperatureHistoryChart.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemperatureHistoryChart.swift; sourceTree = "<group>"; };
@@ -94,7 +84,6 @@
 		E2A554002A3A6403005204C3 /* DeviceTime.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DeviceTime.swift; sourceTree = "<group>"; };
 		E2A554042A4ADA93005204C3 /* TransferView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TransferView.swift; sourceTree = "<group>"; };
 		E2A554062A4ADB9C005204C3 /* TemperatureDataTransferDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemperatureDataTransferDelegate.swift; sourceTree = "<group>"; };
-		E2A554082A4ADCC9005204C3 /* DeviceConnection.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DeviceConnection.swift; sourceTree = "<group>"; };
 		E2A5540B2A4ADFC6005204C3 /* DeviceInfoRequest.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DeviceInfoRequest.swift; sourceTree = "<group>"; };
 		E2A5540D2A4C9C4C005204C3 /* BluetoothRequestType.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BluetoothRequestType.swift; sourceTree = "<group>"; };
 		E2A5540F2A4C9C68005204C3 /* DeviceRequest.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DeviceRequest.swift; sourceTree = "<group>"; };
@@ -103,6 +92,7 @@
 		E2E69B5F2A4CD48F00C6035E /* IconAndTextView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = IconAndTextView.swift; sourceTree = "<group>"; };
 		E2E69B612A4D7C3100C6035E /* BluetoothScanner.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BluetoothScanner.swift; sourceTree = "<group>"; };
 		E2E69B652A4DA48B00C6035E /* BluetoothDevice.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BluetoothDevice.swift; sourceTree = "<group>"; };
+		E2E69B672A529FA800C6035E /* TransferHandler.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TransferHandler.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -185,12 +175,7 @@
 		88CDE0792A28AF3E00114294 /* Bluetooth */ = {
 			isa = PBXGroup;
 			children = (
-				88CDE0602A25108100114294 /* BluetoothClient.swift */,
-				88CDE07A2A28AF5100114294 /* BluetoothRequest.swift */,
 				88404DE02A31CA6B00D30244 /* BluetoothResponseType.swift */,
-				88CDE05C2A250F3C00114294 /* DeviceManager.swift */,
-				88CDE0732A28AEE500114294 /* DeviceManagerDelegate.swift */,
-				88CDE05E2A250F5200114294 /* DeviceState.swift */,
 				88CDE06C2A28A92000114294 /* DeviceInfo.swift */,
 				E2A554002A3A6403005204C3 /* DeviceTime.swift */,
 				88404DEA2A37BE3000D30244 /* DeviceWakeCause.swift */,
@@ -230,7 +215,6 @@
 		E2A5540A2A4ADD1D005204C3 /* Connection */ = {
 			isa = PBXGroup;
 			children = (
-				E2A554082A4ADCC9005204C3 /* DeviceConnection.swift */,
 				E2A5540D2A4C9C4C005204C3 /* BluetoothRequestType.swift */,
 				E2A5540F2A4C9C68005204C3 /* DeviceRequest.swift */,
 				E2A5540B2A4ADFC6005204C3 /* DeviceInfoRequest.swift */,
@@ -238,6 +222,7 @@
 				E2A554152A4C9D2E005204C3 /* DeviceDataResetRequest.swift */,
 				E2E69B612A4D7C3100C6035E /* BluetoothScanner.swift */,
 				E2E69B652A4DA48B00C6035E /* BluetoothDevice.swift */,
+				E2E69B672A529FA800C6035E /* TransferHandler.swift */,
 			);
 			path = Connection;
 			sourceTree = "<group>";
@@ -323,13 +308,10 @@
 				88404DDB2A2F4DCA00D30244 /* MeasurementDailyCount.swift in Sources */,
 				E2A554142A4C9C96005204C3 /* DeviceDataRequest.swift in Sources */,
 				88CDE0512A2508E900114294 /* ContentView.swift in Sources */,
-				88CDE05F2A250F5200114294 /* DeviceState.swift in Sources */,
 				88CDE0632A253AD900114294 /* TemperatureDataTransfer.swift in Sources */,
-				E2A554092A4ADCC9005204C3 /* DeviceConnection.swift in Sources */,
 				88CDE0702A28AEA300114294 /* TemperatureMeasurement.swift in Sources */,
 				E2A554162A4C9D2E005204C3 /* DeviceDataResetRequest.swift in Sources */,
 				88404DE12A31CA6B00D30244 /* BluetoothResponseType.swift in Sources */,
-				88CDE05D2A250F3C00114294 /* DeviceManager.swift in Sources */,
 				88404DDF2A2F68E100D30244 /* TemperatureDayOverview.swift in Sources */,
 				E2E69B602A4CD48F00C6035E /* IconAndTextView.swift in Sources */,
 				E2A554052A4ADA93005204C3 /* TransferView.swift in Sources */,
@@ -344,7 +326,6 @@
 				E2E69B622A4D7C3100C6035E /* BluetoothScanner.swift in Sources */,
 				88404DE32A31F20E00D30244 /* Int+Extensions.swift in Sources */,
 				E2A5540C2A4ADFC6005204C3 /* DeviceInfoRequest.swift in Sources */,
-				88CDE07B2A28AF5100114294 /* BluetoothRequest.swift in Sources */,
 				E2E69B662A4DA48B00C6035E /* BluetoothDevice.swift in Sources */,
 				E2A553FD2A39C86B005204C3 /* LogEntry.swift in Sources */,
 				E2A553F92A399F58005204C3 /* Log.swift in Sources */,
@@ -353,9 +334,8 @@
 				88404DD22A2F0D8F00D30244 /* Double+Extensions.swift in Sources */,
 				E2A554102A4C9C68005204C3 /* DeviceRequest.swift in Sources */,
 				E253A9222A2B39B700EC6B28 /* Color+Extensions.swift in Sources */,
-				88CDE0612A25108100114294 /* BluetoothClient.swift in Sources */,
 				E2A554072A4ADB9C005204C3 /* TemperatureDataTransferDelegate.swift in Sources */,
-				88CDE0742A28AEE500114294 /* DeviceManagerDelegate.swift in Sources */,
+				E2E69B682A529FA800C6035E /* TransferHandler.swift in Sources */,
 				88404DEB2A37BE3000D30244 /* DeviceWakeCause.swift in Sources */,
 				88CDE06D2A28A92000114294 /* DeviceInfo.swift in Sources */,
 				E2A553FB2A39C82D005204C3 /* LogView.swift in Sources */,

TempTrack/Bluetooth/BluetoothClient.swift

@@ -1,304 +0,0 @@
-import Foundation
-import SwiftUI
-/*
-final class BluetoothClient: ObservableObject {
-    
-    private let updateInterval = 3.0
-
-    private let minimumOffsetToUpdateDeviceClock = 5.0
-    
-    private let connection = DeviceManager()
-
-    private let storage: PersistentStorage
-
-    var hasInfo: Bool {
-        deviceInfo != nil
-    }
-
-    var isConnected: Bool {
-        if case .configured = deviceState {
-            return true
-        }
-        return false
-    }
-
-    private var isUpdatingFlag = false
-
-    @Published
-    var shouldConnect: Bool {
-        didSet {
-            isUpdatingFlag = true
-            connection.shouldConnectIfPossible = shouldConnect
-            log.info("Should connect: \(shouldConnect)")
-            isUpdatingFlag = false
-        }
-    }
-    
-    init(storage: PersistentStorage, shouldConnect: Bool = false, deviceInfo: DeviceInfo? = nil) {
-        self.storage = storage
-        self.deviceInfo = deviceInfo
-        self.shouldConnect = shouldConnect
-        connection.shouldConnectIfPossible = shouldConnect
-        connection.delegate = self
-    }
-    
-    func connect() -> Bool {
-        connection.connect()
-    }
-    
-    @Published
-    private(set) var deviceState: DeviceState = .disconnected {
-        didSet {
-            log.info("State: \(deviceState)")
-            if case .configured = deviceState {
-                startRegularUpdates()
-            } else {
-                endRegularUpdates()
-            }
-        }
-    }
-    
-    @Published
-    private(set) var deviceInfo: DeviceInfo? {
-        didSet {
-            // collectRecordedData()
-            if let deviceInfo, let runningTransfer {
-                runningTransfer.update(info: deviceInfo)
-                let next = runningTransfer.nextRequest()
-                addRequest(next)
-            }
-        }
-    }
-    
-    private var openRequests: [BluetoothRequest] = []
-    
-    private var runningRequest: BluetoothRequest?
-    
-    private var runningTransfer: TemperatureDataTransfer?
-    
-    // MARK: Regular updates
-    
-    func updateDeviceInfo() {
-        guard case .configured = deviceState else {
-            return
-        }
-        addRequest(.getInfo)
-        
-    }
-    
-    private var dataUpdateTimer: Timer?
-    
-    private func startRegularUpdates() {
-        guard dataUpdateTimer == nil else {
-            return
-        }
-        log.info("Starting updates")
-        dataUpdateTimer = Timer.scheduledTimer(withTimeInterval: updateInterval, repeats: true) { [weak self] timer in
-            guard let self = self else {
-                timer.invalidate()
-                return
-            }
-            self.updateDeviceInfo()
-        }
-        
-        dataUpdateTimer?.fire()
-    }
-
-    private func endRegularUpdates() {
-        guard let dataUpdateTimer else {
-            return
-        }
-        dataUpdateTimer.invalidate()
-        runningRequest = nil
-        self.dataUpdateTimer = nil
-        log.info("Ending updates")
-    }
-    
-    // MARK: Requests
-
-    func clearDeviceStorage() {
-        guard let count = deviceInfo?.numberOfRecordedBytes else {
-            log.info("Can't clear device data without device info")
-            return
-        }
-        addRequest(.clearRecordingBuffer(byteCount: count))
-    }
-    
-    private func performNextRequest() {
-        guard runningRequest == nil else {
-            return
-        }
-        guard !openRequests.isEmpty else {
-            return
-        }
-        let next = openRequests.removeFirst()
-        
-        guard connection.send(next.serialized) else {
-            log.warning("Failed to start request \(next)")
-            performNextRequest()
-            return
-        }
-        runningRequest = next
-    }
-    
-    func addRequest(_ request: BluetoothRequest) {
-        defer {
-            performNextRequest()
-        }
-        let type = request.byte
-        if let runningRequest, runningRequest.byte == type {
-            log.info("Skipping duplicate request \(request)")
-            return
-        }
-        guard !openRequests.contains(where: { $0.byte == type }) else {
-            log.info("Skipping duplicate request \(request)")
-            return
-        }
-        openRequests.append(request)
-    }
-    
-    // MARK: Data transfer
-    
-    @discardableResult
-    func collectRecordedData() -> Bool {
-        guard runningTransfer == nil else {
-            log.info("Transfer already running")
-            return false
-        }
-        guard !openRequests.contains(where: { if case .getRecordingData = $0 { return true }; return false }) else {
-            log.info("Transfer already scheduled")
-            return false
-        }
-        guard let info = deviceInfo else {
-            log.warning("No device info to start transfer")
-            return false
-        }
-        guard info.numberOfStoredMeasurements > 0 else {
-            return false
-        }
-        let transfer = TemperatureDataTransfer(info: info, previous: storage.lastDeviceTime)
-        runningTransfer = transfer
-        let next = transfer.nextRequest()
-        log.info("Starting transfer")
-        addRequest(next)
-        return true
-    }
-    
-    private func didReceive(data: Data, offset: Int, count: Int) {
-        guard let runningTransfer else {
-            log.warning("No running transfer to process device data")
-            self.runningRequest = nil
-            return // TODO: Start new transfer?
-        }
-        guard runningTransfer.add(data: data, offset: offset, count: count) else {
-            self.runningRequest = nil
-            return // TODO: Start new transfer
-        }
-        let next = runningTransfer.nextRequest()
-        addRequest(next)
-    }
-    
-    private func decode(info: Data) {
-        guard let newInfo = try? DeviceInfo(info: info) else {
-            log.error("Failed to decode device info")
-            return
-        }
-        self.deviceInfo = newInfo
-    }
-}
-
-extension BluetoothClient: DeviceManagerDelegate {
-
-    func deviceManager(shouldConnectToDevice: Bool) {
-        guard !isUpdatingFlag else {
-            return
-        }
-        self.shouldConnect = shouldConnectToDevice
-    }
-    
-    func deviceManager(didReceive data: Data) {
-        defer {
-            performNextRequest()
-        }
-        guard let runningRequest else {
-            log.warning("No request active, but \(data) received")
-            return
-        }
-        self.runningRequest = nil
-        
-        guard data.count > 0 else {
-            log.error("No response data for request \(runningRequest)")
-            return
-        }
-        
-        guard let type = BluetoothResponseType(rawValue: data[0]) else {
-            log.error("Unknown response \(data[0]) for request \(runningRequest)")
-            return
-        }
-        switch type {
-        case .success:
-            break
-        case .responseInProgress:
-            log.info("Device is busy for \(runningRequest)")
-            // Retry the request
-            addRequest(runningRequest)
-            return
-        case .invalidNumberOfBytesToDelete:
-            guard case .clearRecordingBuffer = runningRequest else {
-                log.error("Request \(runningRequest) received non-matching response about number of bytes to delete")
-                return
-            }
-            // If clearing the recording buffer fails due to byte mismatch,
-            // then requesting new info will resolve the mismatch, and the transfer will be resumed
-            addRequest(.getInfo)
-
-        case .responseTooLarge:
-            guard case .getRecordingData = runningRequest else {
-                log.error("Unexpectedly exceeded payload size for request \(runningRequest)")
-                return
-            }
-            // If requesting bytes fails due to the response size,
-            // then requesting new info will update the response size, and the transfer will be resumed
-            addRequest(.getInfo)
-        default:
-            log.error("Unknown response \(data[0]) for request \(runningRequest)")
-            // If clearing the recording buffer fails due to byte mismatch,
-            // then requesting new info will resolve the mismatch, and the transfer will be resumed
-            
-            addRequest(.getInfo)
-            return
-        
-        }
-        let payload = data.dropFirst()
-        
-        switch runningRequest {
-        case .getInfo:
-            decode(info: payload)
-        case .getRecordingData(let offset, let count):
-            didReceive(data: payload, offset: offset, count: count)
-        case .clearRecordingBuffer:
-            didClearDeviceStorage()
-        }
-    }
-
-    private func didClearDeviceStorage() {
-        guard let runningTransfer else {
-            log.warning("No running transfer after clearing device storage")
-            return
-        }
-        defer { self.runningTransfer = nil }
-        guard runningTransfer.completeTransfer() else {
-            return
-        }
-        storage.add(runningTransfer.measurements)
-        storage.lastDeviceTime = runningTransfer.time
-    }
-    
-    func deviceManager(didChangeState state: DeviceState) {
-        DispatchQueue.main.async {
-            self.deviceState = state
-        }
-    }
-}
-
-*/

TempTrack/Bluetooth/BluetoothRequest.swift

@@ -1,67 +0,0 @@
-import Foundation
-/*
-enum BluetoothRequest {
-    /**
-     * Request the number of bytes already recorded
-     *
-     * Request:
-     * - No additional bytes expected
-     *
-     * Response:
-     * - `BluetoothResponseType.success`
-     * - the number of recorded bytes as a `Uint16` (2 bytes)
-     * - the number of seconds until the next measurement as a `Uint16` (2 bytes)
-     * - the number of seconds between measurements as a `Uint16` (2 bytes)
-     * - the number of measurements as a `Uint16` (2 bytes)
-     * - the maximum number of bytes to request as a `Uint16` (2 bytes)
-     * - the number of seconds since power on as a `Uint32` (4 bytes)
-     */
-    case getInfo
-
-    /**
-     * Request recording data
-     *
-     * Request:
-     * - Bytes 1-2: Memory offset (`UInt16`)
-     * - Bytes 3-4: Number of bytes (`UInt16`)
-     *
-     * Response:
-     * - `BluetoothResponseType.success`, plus the requested bytes
-     * - `BluetoothResponseType.responseTooLarge` if too many bytes are requested
-     */
-    case getRecordingData(offset: Int, count: Int)
-    
-    /**
-     * Request deletion of recordings
-     *
-     * Request:
-     * - Bytes 1-2: Number of bytes to clear (uint16_t)
-     *
-     * Response:
-     * - `BluetoothResponseType.success`
-     * - `BluetoothResponseType.invalidNumberOfBytesToDelete`, if the number of bytes does not match.
-     *   This may happen when a new temperature recording is performed in between calls
-     */
-    case clearRecordingBuffer(byteCount: Int)
-    
-    var serialized: Data {
-        let firstByte = Data([byte])
-        switch self {
-        case .getInfo:
-            return firstByte
-        case .getRecordingData(let offset, let count):
-            return firstByte + count.twoByteData + offset.twoByteData
-        case .clearRecordingBuffer(let byteCount):
-            return firstByte + byteCount.twoByteData
-        }
-    }
-    
-    var byte: UInt8 {
-        switch self {
-        case .getInfo: return 0
-        case .getRecordingData: return 1
-        case .clearRecordingBuffer: return 2
-        }
-    }
-}
-*/

TempTrack/Bluetooth/DeviceInfo.swift

@@ -2,15 +2,15 @@ import Foundation
 
 struct DeviceInfo {
 
-    /**
+    /// The unique ID generated by the device to distinguish between power cycles
-     The maximum factor by which the device clock can run
+    let uniqueIdOfPowerCycle: Int
-     */
-    private let maximumTimeDilationFactor: Double = 0.01
-
 
     /// The number of bytes recorded by the tracker
     let numberOfRecordedBytes: Int
 
+    /// The sum of all recorded bytes
+    let dataChecksum: UInt16
+
     /// The number of measurements already performed
     let numberOfStoredMeasurements: Int
     
@@ -46,54 +46,15 @@ struct DeviceInfo {
         time.nextMeasurement.addingTimeInterval(-Double(numberOfStoredMeasurements * measurementInterval))
     }
 
-    func estimatedTimeDilation(to previous: DeviceTime?) -> (start: Date, dilation: Double) {
-        let trivialResult = (start: currentMeasurementStartTime, dilation: 1.0)
-        guard let previous else {
-            log.info("No previous device time to compare")
-            return trivialResult
-        }
-        // Check if device was restarted in between
-        guard time.secondsSincePowerOn >= previous.secondsSincePowerOn else {
-            log.info("Device restarted (runtime decreased from \(previous.secondsSincePowerOn) to \(time.secondsSincePowerOn))")
-            return trivialResult
-        }
-        let newMeasurementCount = time.totalNumberOfMeasurements - previous.totalNumberOfMeasurements
-        guard newMeasurementCount >= 0 else {
-            log.info("Device restarted (measurements decreased from \(previous.totalNumberOfMeasurements) to \(time.totalNumberOfMeasurements))")
-            return trivialResult
-        }
-        guard newMeasurementCount > 0 else {
-            log.warning("No new measurements to calculate time difference")
-            return trivialResult
-        }
-
-        // Check that no measurements are missing
-
-        // Calculate the difference between the expected time for the next measurement and the device time
-        let deviceTimeDifference = Double(newMeasurementCount * measurementInterval)
-        let expectedNextMeasurement = previous.nextMeasurement.addingTimeInterval(deviceTimeDifference)
-        let timeDifference = time.nextMeasurement.timeIntervalSince(expectedNextMeasurement)
-
-        let realTimeDifference = time.nextMeasurement.timeIntervalSince(previous.nextMeasurement)
-        let timeDilation = realTimeDifference / deviceTimeDifference
-
-        log.info("Device time dilation \(timeDilation) (difference \(timeDifference))")
-
-        guard abs(timeDilation - 1.0) < maximumTimeDilationFactor else {
-            log.warning("Device time too different from expected value (difference \(timeDifference) s)")
-            return (currentMeasurementStartTime, 1.0)
-        }
-        return (previous.nextMeasurement, timeDilation)
-    }
 }
 
 extension DeviceInfo {
     
     init(info: Data) throws {
         let date = Date()
-
         var data = info
 
+        self.uniqueIdOfPowerCycle = try data.decodeFourByteInteger()
         self.numberOfRecordedBytes = try data.decodeTwoByteInteger()
         let secondsUntilNextMeasurement = try data.decodeTwoByteInteger()
         self.measurementInterval = try data.decodeTwoByteInteger()
@@ -102,16 +63,24 @@ extension DeviceInfo {
         self.transferBlockSize = try data.decodeTwoByteInteger()
         self.storageSize = try data.decodeTwoByteInteger()
         let secondsSincePowerOn = try data.decodeFourByteInteger()
+        let startSecondsOfCurrentRecording = try data.decodeFourByteInteger()
+        self.dataChecksum = try data.decodeUInt16()
+        self.wakeupReason = .init(rawValue: try data.getByte()) ?? .WAKEUP_UNDEFINED
+
+        self.sensor0 = try data.decodeSensor()
+        self.sensor1 = try data.decodeSensor()
+
+        guard data.isEmpty else {
+            log.error("\(data.count) bytes remaining in device info buffer")
+            throw DeviceInfoError.missingData
+        }
 
         self.time = .init(
             date: date,
             secondsSincePowerOn: secondsSincePowerOn,
             totalNumberOfMeasurements: totalNumberOfMeasurements,
-            secondsUntilNextMeasurement: secondsUntilNextMeasurement)
+            secondsUntilNextMeasurement: secondsUntilNextMeasurement,
-        let _ = try data.decodeFourByteInteger()
+            secondsOfFirstMeasurement: startSecondsOfCurrentRecording)
-        self.sensor0 = try data.decodeSensor()
-        self.sensor1 = try data.decodeSensor()
-        self.wakeupReason = .init(rawValue: try data.getByte()) ?? .WAKEUP_UNDEFINED
     }
 }
 
@@ -119,7 +88,9 @@ extension DeviceInfo {
     
     static var mock: DeviceInfo {
         .init(
+            uniqueIdOfPowerCycle: .random(in: 0...Int(UInt32.max)),
             numberOfRecordedBytes: 123,
+            dataChecksum: .random(in: .min...UInt16.max),
             numberOfStoredMeasurements: 234,
             measurementInterval: 60,
             sensor0: .init(address: [0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08], value: .value(21.0), date: .now.addingTimeInterval(-2)),
@@ -130,3 +101,7 @@ extension DeviceInfo {
             transferBlockSize: 180)
     }
 }
+
+extension DeviceInfo: Codable {
+
+}

TempTrack/Bluetooth/DeviceManager.swift

@@ -1,258 +0,0 @@
-import Foundation
-import CoreBluetooth
-
-final class DeviceManager: NSObject, CBCentralManagerDelegate {
-
-    static let serviceUUID = CBUUID(string: "22071991-cccc-cccc-cccc-000000000001")
-    
-    static let characteristicUUID = CBUUID(string: "22071991-cccc-cccc-cccc-000000000002")
-    
-    private var manager: CBCentralManager! = nil
-    
-    private(set) var lastRSSI: Int = 0
-    
-    weak var delegate: DeviceManagerDelegate?
-
-    var state: DeviceState = .disconnected {
-        didSet {
-            delegate?.deviceManager(didChangeState: state)
-        }
-    }
-    
-    override init() {
-        super.init()
-        self.manager = CBCentralManager(delegate: self, queue: nil)
-    }
-
-    @discardableResult
-    func connect() -> Bool {
-        switch state {
-        case .bluetoothDisabled:
-            log.info("Can't connect, bluetooth disabled")
-            return false
-        case .disconnected:
-            break
-        default:
-            return true
-        }
-        guard !manager.isScanning else {
-            state = .scanning
-            return true
-        }
-        if !shouldConnectIfPossible {
-            shouldConnectIfPossible = true
-        }
-        state = .scanning
-        manager.scanForPeripherals(withServices: [DeviceManager.serviceUUID])
-        return true
-    }
-
-    var shouldConnectIfPossible = true {
-        didSet {
-            updateConnectionOnChange()
-            delegate?.deviceManager(shouldConnectToDevice: shouldConnectIfPossible)
-        }
-    }
-    
-    private func updateConnectionOnChange() {
-        if shouldConnectIfPossible {
-            ensureConnection()
-        } else {
-            disconnectIfNeeded()
-        }
-    }
-
-    private func ensureConnection() {
-        switch state {
-        case .disconnected:
-            connect()
-        default:
-            return
-        }
-    }
-
-    private func disconnectIfNeeded() {
-        switch state {
-        case .bluetoothDisabled, .disconnected:
-            return
-        default:
-            disconnect()
-        }
-    }
-    
-    func disconnect() {
-        if shouldConnectIfPossible {
-            shouldConnectIfPossible = false
-        }
-        switch state {
-        case .bluetoothDisabled, .disconnected:
-            return
-        case .scanning:
-            manager.stopScan()
-            state = .disconnected
-            return
-        case .connecting(let device),
-                .discoveringCharacteristic(let device),
-                .discoveringServices(device: let device),
-                .configured(let device, _):
-            manager.cancelPeripheralConnection(device)
-            manager.stopScan()
-            state = .disconnected
-            return
-        }
-    }
-
-    @discardableResult
-    func send(_ data: Data) -> Bool {
-        guard case .configured(let device, let characteristic) = state else {
-            return false
-        }
-        device.writeValue(data, for: characteristic, type: .withResponse)
-        return self.read()
-    }
-
-    @discardableResult
-    private func read() -> Bool {
-        guard case .configured(let device, let characteristic) = state else {
-            return false
-        }
-        device.readValue(for: characteristic)
-        return true
-    }
-
-    func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
-        guard shouldConnectIfPossible else {
-            return
-        }
-        peripheral.delegate = self
-        manager.connect(peripheral)
-        manager.stopScan()
-        state = .connecting(device: peripheral)
-    }
-        
-    func centralManagerDidUpdateState(_ central: CBCentralManager) {
-        switch central.state {
-        case .poweredOff:
-            state = .bluetoothDisabled
-        case .poweredOn:
-            state = .disconnected
-            connect()
-        case .unsupported:
-            state = .bluetoothDisabled
-            log.info("Bluetooth is not supported")
-        case .unknown:
-            state = .bluetoothDisabled
-            log.info("Bluetooth state is unknown")
-        case .resetting:
-            state = .bluetoothDisabled
-            log.info("Bluetooth is resetting")
-        case .unauthorized:
-            state = .bluetoothDisabled
-            log.info("Bluetooth is not authorized")
-        @unknown default:
-            state = .bluetoothDisabled
-            log.warning("Unknown state \(central.state)")
-        }
-    }
-        
-    func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
-        log.info("Connected to " +  peripheral.name!)
-        peripheral.discoverServices([DeviceManager.serviceUUID])
-        state = .discoveringServices(device: peripheral)
-    }
-        
-    func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {
-        log.info("Disconnected from " +  peripheral.name!)
-        state = .disconnected
-        // Attempt to reconnect
-        if shouldConnectIfPossible {
-            connect()
-        }
-    }
-    
-    func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
-        log.warning("Failed to connect device '\(peripheral.name ?? "NO_NAME")'")
-        if let error = error {
-            log.warning(error.localizedDescription)
-        }
-        state = manager.isScanning ? .scanning : .disconnected
-        // Attempt to reconnect
-        if shouldConnectIfPossible {
-            connect()
-        }
-    }
-}
-
-extension DeviceManager: CBPeripheralDelegate {
-    
-    func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
-        guard let services = peripheral.services, !services.isEmpty else {
-            log.error("No services found for device '\(peripheral.name ?? "NO_NAME")'")
-            manager.cancelPeripheralConnection(peripheral)
-            return
-        }
-        guard let service = services.first(where: { $0.uuid.uuidString == DeviceManager.serviceUUID.uuidString }) else {
-            log.error("Required service not found for '\(peripheral.name ?? "NO_NAME")': \(services.map { $0.uuid.uuidString})")
-            manager.cancelPeripheralConnection(peripheral)
-            return
-        }
-        peripheral.discoverCharacteristics([DeviceManager.characteristicUUID], for: service)
-        state = .discoveringCharacteristic(device: peripheral)
-    }
-    
-    func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
-        if let error = error {
-            log.error("Failed to discover characteristics: \(error)")
-            manager.cancelPeripheralConnection(peripheral)
-            return
-        }
-        guard let characteristics = service.characteristics, !characteristics.isEmpty else {
-            log.error("No characteristics found for device")
-            manager.cancelPeripheralConnection(peripheral)
-            return
-        }
-        for characteristic in characteristics {
-            guard characteristic.uuid == DeviceManager.characteristicUUID else {
-                log.warning("Unused characteristic \(characteristic.uuid.uuidString)")
-                continue
-            }
-            state = .configured(device: peripheral, characteristic: characteristic)
-            peripheral.setNotifyValue(true, for: characteristic)
-        }
-    }
-    
-    func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) {
-        if let error = error {
-            log.error("Peripheral failed to write value for \(characteristic.uuid.uuidString): \(error)")
-        }
-    }
-    
-    func peripheral(_ peripheral: CBPeripheral, didReadRSSI RSSI: NSNumber, error: Error?) {
-        if let error = error {
-            log.warning("Failed to get RSSI: \(error)")
-            return
-        }
-        lastRSSI = RSSI.intValue
-        log.info("RSSI: \(lastRSSI)")
-    }
-    
-    func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
-        if let error = error {
-            log.error("Failed to read value update: \(error)")
-            return
-        }
-        guard case .configured(device: _, characteristic: let storedCharacteristic) = state else {
-            log.warning("Received data while not properly configured")
-            return
-        }
-        guard characteristic.uuid == storedCharacteristic.uuid else {
-            log.warning("Read unknown characteristic \(characteristic.uuid.uuidString)")
-            return
-        }
-        guard let data = characteristic.value else {
-            log.warning("No data")
-            return
-        }
-        delegate?.deviceManager(didReceive: data)
-    }
-}

TempTrack/Bluetooth/DeviceManagerDelegate.swift

@@ -1,10 +0,0 @@
-import Foundation
-
-protocol DeviceManagerDelegate: AnyObject {
-
-    func deviceManager(shouldConnectToDevice: Bool)
-    
-    func deviceManager(didReceive data: Data)
-    
-    func deviceManager(didChangeState state: DeviceState)
-}

TempTrack/Bluetooth/DeviceState.swift

@@ -1,82 +0,0 @@
-import Foundation
-import CoreBluetooth
-
-enum DeviceState {
-
-    case bluetoothDisabled
-
-    case scanning
-
-    case connecting(device: CBPeripheral)
-
-    case discoveringServices(device: CBPeripheral)
-
-    case discoveringCharacteristic(device: CBPeripheral)
-
-    case configured(device: CBPeripheral, characteristic: CBCharacteristic)
-
-    case disconnected
-
-    var text: String {
-        switch self {
-        case .bluetoothDisabled:
-            return "Bluetooth is disabled"
-        case .scanning:
-            return "Scanning..."
-        case .connecting(let device):
-            guard let name = device.name else {
-                return "Connecting..."
-            }
-            return "Connecting to \(name)..."
-        case .discoveringServices:
-            return "Discovering service..."
-        case .discoveringCharacteristic:
-            return "Discovering characteristic..."
-        case .configured(let device, _):
-            guard let name = device.name else {
-                return "Connected"
-            }
-            return name
-        case .disconnected:
-            return "Not connected"
-        }
-    }
-
-    var device: CBPeripheral? {
-        switch self {
-        case .bluetoothDisabled, .disconnected, .scanning:
-            return nil
-        case .connecting(let device),
-                .discoveringCharacteristic(let device),
-                .discoveringServices(device: let device),
-                .configured(let device, _):
-            return device
-        }
-    }
-}
-
-extension DeviceState: CustomStringConvertible {
-
-    var description: String {
-        switch self {
-        case .bluetoothDisabled:
-            return "Bluetooth disabled"
-        case .scanning:
-            return "Searching for device"
-        case .connecting:
-            return "Connecting to device"
-        case .discoveringServices:
-            return "Discovering services"
-        case .discoveringCharacteristic:
-            return "Discovering characteristics"
-        case .configured:
-            return "Connected"
-        case .disconnected:
-            return "Disconnected"
-        }
-    }
-}
-
-extension DeviceState: Equatable {
-    
-}

TempTrack/Bluetooth/DeviceTime.swift

@@ -10,6 +10,8 @@ struct DeviceTime {
 
     let secondsUntilNextMeasurement: Int
 
+    let secondsOfFirstMeasurement: Int
+
     var nextMeasurement: Date {
         date.adding(seconds: secondsUntilNextMeasurement)
     }
@@ -47,6 +49,7 @@ extension DeviceTime: Codable {
         self.secondsSincePowerOn = try container.decode(Int.self)
         self.totalNumberOfMeasurements = try container.decode(Int.self)
         self.secondsUntilNextMeasurement = try container.decode(Int.self)
+        self.secondsOfFirstMeasurement = try container.decode(Int.self)
     }
 
     func encode(to encoder: Encoder) throws {
@@ -55,6 +58,7 @@ extension DeviceTime: Codable {
         try container.encode(secondsSincePowerOn)
         try container.encode(totalNumberOfMeasurements)
         try container.encode(secondsUntilNextMeasurement)
+        try container.encode(secondsOfFirstMeasurement)
     }
 }
 
@@ -65,6 +69,7 @@ extension DeviceTime {
             date: .now,
             secondsSincePowerOn: 125,
             totalNumberOfMeasurements: 3,
-            secondsUntilNextMeasurement: 55)
+            secondsUntilNextMeasurement: 55,
+            secondsOfFirstMeasurement: 1)
     }
 }

TempTrack/Bluetooth/DeviceWakeCause.swift

@@ -75,3 +75,7 @@ extension DeviceWakeCause {
         }
     }
 }
+
+extension DeviceWakeCause: Codable {
+    
+}

TempTrack/Connection/BluetoothDevice.swift

@@ -1,18 +1,29 @@
 import Foundation
 import CoreBluetooth
 
+protocol BluetoothDeviceDelegate: AnyObject {
+
+    func bluetoothDevice(didUpdate info: DeviceInfo?)
+}
+
 actor BluetoothDevice: NSObject, ObservableObject {
 
-    private let peripheral: CBPeripheral!
+    let peripheral: CBPeripheral!
 
     private let characteristic: CBCharacteristic!
 
-    @MainActor @Published
+    @Published
     var lastDeviceInfo: DeviceInfo?
 
     @Published
     private(set) var lastRSSI: Int = 0
 
+    weak var delegate: BluetoothDeviceDelegate?
+
+    func set(delegate: BluetoothDeviceDelegate?) {
+        self.delegate = delegate
+    }
+
     init(peripheral: CBPeripheral, characteristic: CBCharacteristic) {
         self.peripheral = peripheral
         self.characteristic = characteristic
@@ -33,9 +44,10 @@ actor BluetoothDevice: NSObject, ObservableObject {
         guard let info = await getInfo() else {
             return
         }
-        Task { @MainActor in
         lastDeviceInfo = info
-        }
+        delegate?.bluetoothDevice(didUpdate: info)
+        #warning("Don't use global variable")
+        storage.save(deviceInfo: info)
     }
 
     func getInfo() async -> DeviceInfo? {

TempTrack/Connection/BluetoothScanner.swift

@@ -26,26 +26,48 @@ final class BluetoothScanner: NSObject, CBCentralManagerDelegate, ObservableObje
     @Published
     var configuredDevice: BluetoothDevice?
 
+    @Published
+    var lastDeviceInfo: DeviceInfo?
+
     private var connectingDevice: CBPeripheral?
 
-    var isScanningForDevices: Bool {
+    @Published
-        get {
+    var isScanningForDevices: Bool = false {
-            manager.isScanning
+        didSet {
+            if isScanningForDevices {
+                startScanning()
+            } else {
+                stopScanning()
             }
-        set {
+        }
-            if newValue {
+    }
+
+    private func startScanning() {
         guard !manager.isScanning else {
             return
         }
         manager.scanForPeripherals(withServices: [serviceUUID])
         log.info("Scanner: Started scanning for devices")
-            } else {
+    }
+
+    private func stopScanning() {
         guard manager.isScanning else {
             return
         }
         manager.stopScan()
         log.info("Scanner: Stopped scanning for devices")
     }
+
+    var isConnectingOrConnected: Bool {
+        configuredDevice != nil || connectingDevice != nil
+    }
+
+    func disconnect() {
+        if let configuredDevice {
+            manager.cancelPeripheralConnection(configuredDevice.peripheral)
+        }
+        if let connectingDevice {
+            manager.cancelPeripheralConnection(connectingDevice)
         }
     }
 
@@ -53,6 +75,7 @@ final class BluetoothScanner: NSObject, CBCentralManagerDelegate, ObservableObje
         connectionState = .noDeviceFound
         super.init()
         self.manager = CBCentralManager(delegate: self, queue: nil)
+        self.isScanningForDevices = manager.isScanning
     }
 
     func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
@@ -95,6 +118,7 @@ final class BluetoothScanner: NSObject, CBCentralManagerDelegate, ObservableObje
         peripheral.discoverServices([serviceUUID])
         connectingDevice = peripheral
         configuredDevice = nil
+        isScanningForDevices = false
     }
 
     func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {
@@ -121,13 +145,15 @@ extension BluetoothScanner: CBPeripheralDelegate {
             manager.cancelPeripheralConnection(peripheral)
             connectionState = .noDeviceFound
             connectingDevice = nil
+            isScanningForDevices = true
             return
         }
-        guard let service = services.first(where: { $0.uuid.uuidString == DeviceManager.serviceUUID.uuidString }) else {
+        guard let service = services.first(where: { $0.uuid.uuidString == serviceUUID.uuidString }) else {
             log.error("Connected device '\(peripheral.name ?? "No Name")': Required service not found: \(services.map { $0.uuid.uuidString})")
             manager.cancelPeripheralConnection(peripheral)
             connectionState = .noDeviceFound
             connectingDevice = nil
+            isScanningForDevices = true
             return
         }
         peripheral.delegate = self
@@ -142,6 +168,7 @@ extension BluetoothScanner: CBPeripheralDelegate {
             manager.cancelPeripheralConnection(peripheral)
             connectionState = .noDeviceFound
             connectingDevice = nil
+            isScanningForDevices = true
             return
         }
 
@@ -150,6 +177,7 @@ extension BluetoothScanner: CBPeripheralDelegate {
             manager.cancelPeripheralConnection(peripheral)
             connectionState = .noDeviceFound
             connectingDevice = nil
+            isScanningForDevices = true
             return
         }
 
@@ -168,9 +196,22 @@ extension BluetoothScanner: CBPeripheralDelegate {
         guard let desiredCharacteristic else {
             log.error("Connected device '\(peripheral.name ?? "No Name")': Characteristic not found")
             manager.cancelPeripheralConnection(peripheral)
+            isScanningForDevices = true
             return
         }
 
         configuredDevice = .init(peripheral: peripheral, characteristic: desiredCharacteristic)
+        Task {
+            await configuredDevice?.set(delegate: self)
+        }
+    }
+}
+
+extension BluetoothScanner: BluetoothDeviceDelegate {
+
+    func bluetoothDevice(didUpdate info: DeviceInfo?) {
+        DispatchQueue.main.async {
+            self.lastDeviceInfo = info
+        }
     }
 }

TempTrack/Connection/DeviceConnection.swift

@@ -1,405 +0,0 @@
-import Foundation
-import CoreBluetooth
-/*
-actor DeviceConnection: NSObject, CBCentralManagerDelegate, ObservableObject {
-
-    static let serviceUUID = CBUUID(string: "22071991-cccc-cccc-cccc-000000000001")
-
-    static let characteristicUUID = CBUUID(string: "22071991-cccc-cccc-cccc-000000000002")
-
-    private var manager: CBCentralManager! = nil
-
-    private(set) var lastRSSI: Int = 0 // TODO: Provide function to update
-
-    @Published
-    var state: DeviceState = .disconnected
-
-    var isConnected: Bool {
-        // Automatically updates with device state
-        if case .configured = state {
-            return true
-        }
-        return false
-    }
-
-    override init() {
-        super.init()
-        self.manager = CBCentralManager(delegate: self, queue: nil)
-    }
-
-    /**
-     Allow the client to scan for devices and connect to the first device found with the correct characteristic
-     */
-    @discardableResult
-    func initiateDeviceConnection() -> Bool {
-        switch state {
-        case .bluetoothDisabled:
-            log.info("Can't connect, bluetooth disabled")
-            return false
-        case .disconnected:
-            break
-        default:
-            return true
-        }
-        guard !manager.isScanning else {
-            state = .scanning
-            return true
-        }
-        shouldConnectIfPossible = true
-        state = .scanning
-        manager.scanForPeripherals(withServices: [DeviceManager.serviceUUID])
-        return true
-    }
-
-    @discardableResult
-    func updateRSSIForConnectedDevice() -> Bool {
-        guard let device = state.device else {
-            return false
-        }
-        device.readRSSI()
-        return true
-    }
-
-    /**
-     Indicate that a connection should be attempted when found.
-
-     This does not necessarily indicate that the phone is scanning for devices.
-     */
-    @Published
-    var shouldConnectIfPossible = true {
-        didSet {
-            guard oldValue != shouldConnectIfPossible else {
-                return
-            }
-            updateConnectionOnChange()
-        }
-    }
-
-    private func updateConnectionOnChange() {
-        if shouldConnectIfPossible {
-            ensureConnection()
-        } else {
-            disconnectIfNeeded()
-        }
-    }
-
-    private func ensureConnection() {
-        switch state {
-        case .disconnected:
-            initiateDeviceConnection()
-        default:
-            return
-        }
-    }
-
-    private func disconnectIfNeeded() {
-        switch state {
-        case .bluetoothDisabled, .disconnected:
-            return
-        default:
-            disconnect()
-        }
-    }
-
-    func disconnect() {
-        shouldConnectIfPossible = false
-        switch state {
-        case .bluetoothDisabled, .disconnected:
-            return
-        case .scanning:
-            manager.stopScan()
-            state = .disconnected
-            return
-        case .connecting(let device),
-                .discoveringCharacteristic(let device),
-                .discoveringServices(device: let device),
-                .configured(let device, _):
-            manager.cancelPeripheralConnection(device)
-            manager.stopScan()
-            state = .disconnected
-            return
-        }
-    }
-
-    private var requestContinuation: CheckedContinuation<Data?, Never>?
-
-    func getInfo() async -> DeviceInfo? {
-        await get(DeviceInfoRequest())
-    }
-
-    func getDeviceData(offset: Int, count: Int) async -> Data? {
-        await get(DeviceDataRequest(offset: offset, count: count))
-    }
-
-    func deleteDeviceData(byteCount: Int) async -> Bool {
-        await get(DeviceDataResetRequest(byteCount: byteCount)) != nil
-    }
-
-    private func get<Request>(_ request: Request) async -> Request.Response? where Request: DeviceRequest {
-        guard requestContinuation == nil else {
-            // Prevent parallel requests
-            return nil
-        }
-        guard case .configured(let device, let characteristic) = state else {
-            return nil
-        }
-        let requestData = Data([request.type.rawValue]) + request.payload
-        let responseData: Data? = await withCheckedContinuation { continuation in
-            requestContinuation = continuation
-            device.writeValue(requestData, for: characteristic, type: .withResponse)
-            device.readValue(for: characteristic)
-            DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(5)) { [weak self] in
-                Task {
-                    await self?.checkTimeoutForCurrentRequest(request.type)
-                }
-            }
-        }
-
-        guard let responseData else {
-            return nil
-        }
-        guard let responseCode = responseData.first else {
-            log.error("Request \(request.type) got response of zero bytes")
-            return nil
-        }
-        guard let responseType = BluetoothResponseType(rawValue: responseCode) else {
-            log.error("Request \(request.type) got unknown response code \(responseCode)")
-            return nil
-        }
-        switch responseType {
-        case .success, .responseTooLarge, .invalidNumberOfBytesToDelete:
-            break
-        case .invalidCommand:
-            log.error("Request \(request.type) failed: Invalid command")
-            return nil
-        case .unknownCommand:
-            log.error("Request \(request.type) failed: Unknown command")
-            return nil
-        case .responseInProgress:
-            log.info("Request \(request.type) failed: Device is busy")
-            return nil
-        }
-        return request.makeResponse(from: responseData.dropFirst(), responseType: responseType)
-    }
-
-    private func checkTimeoutForCurrentRequest(_ type: BluetoothRequestType) {
-        guard let requestContinuation else { return }
-        log.info("Timed out for request \(type)")
-        requestContinuation.resume(returning: nil)
-        self.requestContinuation = nil
-    }
-
-    nonisolated
-    func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
-        Task {
-            await didDiscover(peripheral: peripheral)
-        }
-    }
-
-    private func didDiscover(peripheral: CBPeripheral) {
-        guard shouldConnectIfPossible else {
-            return
-        }
-        peripheral.delegate = self
-        manager.connect(peripheral)
-        manager.stopScan()
-        state = .connecting(device: peripheral)
-    }
-
-    nonisolated
-    func centralManagerDidUpdateState(_ central: CBCentralManager) {
-        Task {
-            await didUpdate(state: central.state)
-        }
-    }
-
-    private func didUpdate(state newState: CBManagerState) {
-        switch newState {
-        case .poweredOff:
-            state = .bluetoothDisabled
-        case .poweredOn:
-            state = .disconnected
-            initiateDeviceConnection()
-        case .unsupported:
-            state = .bluetoothDisabled
-            log.info("Bluetooth is not supported")
-        case .unknown:
-            state = .bluetoothDisabled
-            log.info("Bluetooth state is unknown")
-        case .resetting:
-            state = .bluetoothDisabled
-            log.info("Bluetooth is resetting")
-        case .unauthorized:
-            state = .bluetoothDisabled
-            log.info("Bluetooth is not authorized")
-        @unknown default:
-            state = .bluetoothDisabled
-            log.warning("Unknown state \(newState)")
-        }
-    }
-
-    nonisolated
-    func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
-        Task {
-            await didConnect(to: peripheral)
-        }
-    }
-
-    private func didConnect(to peripheral: CBPeripheral) {
-        log.info("Connected to " +  peripheral.name!)
-        peripheral.discoverServices([DeviceManager.serviceUUID])
-        state = .discoveringServices(device: peripheral)
-    }
-
-    nonisolated
-    func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {
-        Task {
-            await didDisconnect(from: peripheral, error: error)
-        }
-    }
-
-    private func didDisconnect(from peripheral: CBPeripheral, error: Error?) {
-        log.info("Disconnected from " +  peripheral.name!)
-        state = .disconnected
-        // Attempt to reconnect
-        if shouldConnectIfPossible {
-            initiateDeviceConnection()
-        }
-    }
-
-    nonisolated
-    func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
-        Task {
-            await didFailToConnect(to: peripheral, error: error)
-        }
-    }
-
-    private func didFailToConnect(to peripheral: CBPeripheral, error: Error?) {
-        log.warning("Failed to connect device '\(peripheral.name ?? "NO_NAME")'")
-        if let error = error {
-            log.warning(error.localizedDescription)
-        }
-        state = manager.isScanning ? .scanning : .disconnected
-        // Attempt to reconnect
-        if shouldConnectIfPossible {
-            initiateDeviceConnection()
-        }
-    }
-}
-
-extension DeviceConnection: CBPeripheralDelegate {
-
-    nonisolated
-    func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
-        Task {
-            await didDiscoverServices(for: peripheral)
-        }
-    }
-
-    private func didDiscoverServices(for peripheral: CBPeripheral) {
-        guard let services = peripheral.services, !services.isEmpty else {
-            log.error("No services found for device '\(peripheral.name ?? "NO_NAME")'")
-            manager.cancelPeripheralConnection(peripheral)
-            return
-        }
-        guard let service = services.first(where: { $0.uuid.uuidString == DeviceManager.serviceUUID.uuidString }) else {
-            log.error("Required service not found for '\(peripheral.name ?? "NO_NAME")': \(services.map { $0.uuid.uuidString})")
-            manager.cancelPeripheralConnection(peripheral)
-            return
-        }
-        peripheral.discoverCharacteristics([DeviceManager.characteristicUUID], for: service)
-        state = .discoveringCharacteristic(device: peripheral)
-    }
-
-    nonisolated
-    func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
-        Task {
-            await didDiscoverCharacteristics(for: service, of: peripheral, error: error)
-        }
-    }
-
-    private func didDiscoverCharacteristics(for service: CBService, of peripheral: CBPeripheral, error: Error?) {
-        if let error = error {
-            log.error("Failed to discover characteristics: \(error)")
-            manager.cancelPeripheralConnection(peripheral)
-            return
-        }
-        guard let characteristics = service.characteristics, !characteristics.isEmpty else {
-            log.error("No characteristics found for device")
-            manager.cancelPeripheralConnection(peripheral)
-            return
-        }
-        for characteristic in characteristics {
-            guard characteristic.uuid == DeviceManager.characteristicUUID else {
-                log.warning("Unused characteristic \(characteristic.uuid.uuidString)")
-                continue
-            }
-            state = .configured(device: peripheral, characteristic: characteristic)
-            peripheral.setNotifyValue(true, for: characteristic)
-        }
-    }
-
-    nonisolated
-    func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) {
-        if let error = error {
-            log.error("Peripheral failed to write value for \(characteristic.uuid.uuidString): \(error)")
-        }
-    }
-
-    nonisolated
-    func peripheral(_ peripheral: CBPeripheral, didReadRSSI RSSI: NSNumber, error: Error?) {
-        if let error = error {
-            log.warning("Failed to get RSSI: \(error)")
-            return
-        }
-        Task {
-            await update(rssi: RSSI.intValue)
-        }
-        log.info("RSSI: \(RSSI.intValue)")
-    }
-
-    private func update(rssi: Int) {
-        lastRSSI = rssi
-    }
-
-    nonisolated
-    func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
-        Task {
-            await didUpdateValue(for: characteristic, of: peripheral, error: error)
-        }
-    }
-
-        private func didUpdateValue(for characteristic: CBCharacteristic, of peripheral: CBPeripheral, error: Error?) {
-        if let error = error {
-            log.error("Failed to read value update: \(error)")
-            continueRequest(with: nil)
-            return
-        }
-        guard case .configured(device: _, characteristic: let storedCharacteristic) = state else {
-            log.warning("Received data while not properly configured")
-            continueRequest(with: nil)
-            return
-        }
-        guard characteristic.uuid == storedCharacteristic.uuid else {
-            log.warning("Read unknown characteristic \(characteristic.uuid.uuidString)")
-            continueRequest(with: nil)
-            return
-        }
-        guard let data = characteristic.value else {
-            log.warning("No data")
-            continueRequest(with: nil)
-            return
-        }
-        continueRequest(with: data)
-    }
-
-    private func continueRequest(with response: Data?) {
-        guard let requestContinuation else {
-            log.error("No continuation to handle request data (\(response?.count ?? 0) bytes)")
-            return
-        }
-        requestContinuation.resume(returning: response)
-        self.requestContinuation = nil
-    }
-}
-*/

TempTrack/Connection/TransferHandler.swift

@@ -0,0 +1,96 @@
+import Foundation
+
+final class TransferHandler: ObservableObject {
+
+    @Published
+    var bytesTransferred: Double = 0.0
+
+    @Published
+    var totalBytes: Double = 0.0
+
+    @Published
+    var measurements: [TemperatureMeasurement] = []
+
+    @Published
+    var transferIsRunning = false
+
+    func startTransfer(from device: BluetoothDevice, with info: DeviceInfo, storage: PersistentStorage) {
+        #warning("Update device info during transfer")
+        discardTransfer()
+        transferIsRunning = true
+        let total = info.numberOfRecordedBytes
+        let chunkSize = info.transferBlockSize
+        totalBytes = Double(total)
+        Task {
+            defer {
+                DispatchQueue.main.async {
+                    self.transferIsRunning = false
+                }
+            }
+            var data = Data(capacity: total)
+            while data.count < total {
+                let remainingBytes = total - data.count
+                let currentChunkSize = min(remainingBytes, chunkSize)
+                guard let chunk = await device.getDeviceData(offset: data.count, count: currentChunkSize) else {
+                    log.warning("Failed to finish transfer")
+                    return
+                }
+                guard !chunk.isEmpty else {
+                    break
+                }
+                data.append(chunk)
+                let count = Double(data.count)
+                DispatchQueue.main.async {
+                    self.bytesTransferred = count
+                }
+            }
+
+            if data.count != info.numberOfRecordedBytes {
+                log.warning("Expected \(info.numberOfRecordedBytes) in transfer, got only \(data.count)")
+            }
+            let sum = data.reduce(0) { $0 &+ UInt16($1) }
+            if sum != info.dataChecksum {
+                log.warning("Checksum does not match")
+            }
+            if data.count != 4 * info.numberOfStoredMeasurements {
+                log.warning("expected \(4 * info.numberOfStoredMeasurements) bytes for \(info.numberOfStoredMeasurements) measurements, got \(data.count)")
+            }
+            storage.saveTransferData(data: data, date: info.time.date)
+
+            DispatchQueue.main.async {
+                self.bytesTransferred = self.totalBytes
+            }
+
+            let recordingStart = info.currentMeasurementStartTime
+            while !data.isEmpty {
+                guard data.count >= 4 else {
+                    log.error("Expected four bytes at index \(total - data.count - 1)")
+                    break
+                }
+                let intervalCount = try! data.decodeUInt16()
+                let temp0 = TemperatureValue(byte: data.removeFirst())
+                let temp1 = TemperatureValue(byte: data.removeFirst())
+                let date = recordingStart
+                    .addingTimeInterval(TimeInterval(intervalCount) * TimeInterval(info.measurementInterval))
+                let measurement = TemperatureMeasurement(
+                    sensor0: temp0,
+                    sensor1: temp1,
+                    date: date)
+                DispatchQueue.main.async {
+                    self.measurements.append(measurement)
+                }
+            }
+        }
+    }
+
+    func saveTransfer(in storage: PersistentStorage) {
+        storage.add(measurements)
+        discardTransfer()
+    }
+
+    func discardTransfer() {
+        self.measurements = []
+        self.bytesTransferred = 0
+        self.totalBytes = 0
+    }
+}

TempTrack/ContentView.swift

@@ -13,12 +13,15 @@ struct ContentView: View {
 
     private let disconnectedColor = Color(white: 0.8)
 
-    @StateObject
+    @ObservedObject
-    var scanner = BluetoothScanner()
+    var scanner: BluetoothScanner
 
     @EnvironmentObject
     var storage: PersistentStorage
 
+    @EnvironmentObject
+    var transfer: TransferHandler
+
     @State
     var showDeviceInfo = false
     
@@ -34,13 +37,11 @@ struct ContentView: View {
     @State
     var deviceInfoUpdateTimer: Timer?
     
-    init() { }
-    
     var averageTemperature: Double? {
-        guard let bluetoothDevice = scanner.configuredDevice else {
+        guard scanner.configuredDevice != nil else {
             return nil
         }
-        guard let info = bluetoothDevice.lastDeviceInfo else {
+        guard let info = scanner.lastDeviceInfo else {
             return nil
         }
         let t1 = info.sensor1?.optionalValue
@@ -123,7 +124,7 @@ struct ContentView: View {
     }
 
     var hasNoDeviceInfo: Bool {
-        scanner.configuredDevice?.lastDeviceInfo == nil
+        scanner.lastDeviceInfo == nil
     }
 
     var isDisconnected: Bool {
@@ -155,6 +156,7 @@ struct ContentView: View {
                         .cornerRadius(8)
                     if storage.recentMeasurements.isEmpty {
                         Text("No recent measurements")
+                            .foregroundColor(.white)
                     }
                 }
             }
@@ -167,20 +169,26 @@ struct ContentView: View {
                 }
                 Spacer()
                 Button {
-                    self.scanner.isScanningForDevices.toggle()
+                    if scanner.isScanningForDevices {
+                        scanner.isScanningForDevices = false
+                    } else if scanner.isConnectingOrConnected {
+                        scanner.disconnect()
+                    } else {
+                        scanner.isScanningForDevices = true
+                    }
                 } label: {
                     Image(systemSymbol: connectionSymbol)
                         .foregroundColor(.white)
                 }
                 .foregroundColor(.white)
                 Spacer()
-                if let device = scanner.configuredDevice {
+                if scanner.lastDeviceInfo != nil {
                     Button {
                         self.showDeviceInfo = true
                     } label: {
                         Image(systemSymbol: .infoCircle)
-                            .foregroundColor(device.lastDeviceInfo == nil ? .gray : .white)
+                            .foregroundColor(.white)
-                    }.disabled(device.lastDeviceInfo == nil)
+                    }
                     Spacer()
                     Button {
                         showDataTransferView = true
@@ -195,8 +203,6 @@ struct ContentView: View {
                     Image(systemSymbol: .arrowUpArrowDownCircle)
                         .foregroundColor(.gray)
                 }
-
-
             }
             .padding()
             .font(.system(size: 30, weight: .light))
@@ -204,7 +210,7 @@ struct ContentView: View {
         }
         .padding()
         .sheet(isPresented: $showDeviceInfo)  {
-            if let info = scanner.configuredDevice?.lastDeviceInfo {
+            if let info = scanner.lastDeviceInfo {
                 DeviceInfoView(info: info, isPresented: $showDeviceInfo)
             } else {
                 EmptyView()
@@ -217,12 +223,14 @@ struct ContentView: View {
         .sheet(isPresented: $showLog) {
             LogView()
                 .environmentObject(log)
+                .environmentObject(storage)
         }
         .sheet(isPresented: $showDataTransferView) {
             if let client = scanner.configuredDevice {
                 TransferView(
-                    bluetoothClient: client)
+                    bluetoothClient: client, info: $scanner.lastDeviceInfo)
                     .environmentObject(storage)
+                    .environmentObject(transfer)
             } else {
                 EmptyView()
             }
@@ -263,7 +271,7 @@ struct ContentView: View {
 struct ContentView_Previews: PreviewProvider {
     static var previews: some View {
         let storage = PersistentStorage(lastMeasurements: TemperatureMeasurement.mockData)
-        ContentView()
+        ContentView(scanner: .init())
             .environmentObject(storage)
     }
 }

TempTrack/Extensions/UInt16+Extensions.swift

@@ -7,11 +7,11 @@ extension UInt16 {
     }
     
     var low: UInt8 {
-        UInt8(clamping: self)
+        UInt8(self & 0xFF)
     }
     
     var high: UInt8 {
-        UInt8(clamping: self >> 8)
+        UInt8(self >> 8 & 0xFF)
     }
     
     var integer: Int {

TempTrack/Storage/PersistentStorage.swift

@@ -15,9 +15,6 @@ final class PersistentStorage: ObservableObject {
     @AppStorage("newestDate")
     private var newestMeasurementTime: Int = 0
 
-    @AppStorage("deviceTime")
-    private var lastDeviceTimeData: Data?
-
     /**
      The date of the latest measurement.
 
@@ -71,6 +68,8 @@ final class PersistentStorage: ObservableObject {
         
         ensureExistenceOfFolder()
         //recalculateDailyCounts()
+        updateTransferCount()
+        updateDeviceInfoCount()
     }
     
     private func ensureExistenceOfFolder() {
@@ -121,7 +120,7 @@ final class PersistentStorage: ObservableObject {
     private func updateLastMeasurements(_ measurements: [TemperatureMeasurement]) {
         let startDate = Date().addingTimeInterval(-lastValueInterval).seconds
         recentMeasurements = (measurements + recentMeasurements)
-            .filter { $0.id > startDate }
+            .filter { $0.id > startDate }.sorted().reversed()
         log.info("\(recentMeasurements.count) recent measurements (with \(measurements.count) new entries)")
     }
     
@@ -278,35 +277,78 @@ final class PersistentStorage: ObservableObject {
         }
     }
 
-    // MARK: Device time
+    // MARK: Device info archive
 
-    var lastDeviceTime: DeviceTime? {
+    @Published
-        get {
+    var numberOfStoredDeviceInfos: Int = 0
-            guard let data = lastDeviceTimeData else {
+
-                return nil
+    private func updateDeviceInfoCount() {
+        let count = countFiles(in: "info")
+        DispatchQueue.main.async {
+            self.numberOfStoredDeviceInfos = count
+        }
+    }
+
+    @Published
+    var numberOfStoredTransfers: Int = 0
+
+    private func updateTransferCount() {
+        let count = countFiles(in: "transfers")
+        DispatchQueue.main.async {
+            self.numberOfStoredTransfers = count
+        }
+    }
+
+    private func countFiles(in folder: String) -> Int {
+        let folder = PersistentStorage.documentDirectory.appendingPathComponent(folder)
+        guard fm.fileExists(atPath: folder.path) else {
+            return 0
         }
         do {
-                let result: DeviceTime = try BinaryDecoder.decode(from: data)
+            return try fm.contentsOfDirectory(atPath: folder.path).count
-                return result
         } catch {
-                log.error("Failed to decode device time: \(error)")
+            log.error("Failed to count files in '\(folder)': \(error)")
-                lastDeviceTimeData = nil
+            return -1
-                return nil
         }
     }
-        set {
+
-            guard let newValue else {
+    private func save(data: Data, date: Date, in folderName: String) -> Bool {
-                lastDeviceTimeData = nil
+        let folder = PersistentStorage.documentDirectory.appendingPathComponent(folderName)
-                return
+        if !fm.fileExists(atPath: folder.path) {
-            }
             do {
-                let data = try BinaryEncoder.encode(newValue)
+                try fm.createDirectory(at: folder, withIntermediateDirectories: false)
-                lastDeviceTimeData = data
             } catch {
-                log.error("Failed to encode device time: \(error)")
+                log.error("Failed to create folder '\(folderName)': \(error)")
-                lastDeviceTimeData = nil
+                return false
             }
         }
+        let url = folder.appendingPathComponent("\(date.seconds)")
+        do {
+            try data.write(to: url)
+        } catch {
+            log.error("Failed to write '\(url.lastPathComponent)' in '\(folder)': \(error)")
+            return false
+        }
+        return true
+    }
+
+    @discardableResult
+    func save(deviceInfo: DeviceInfo) -> Bool {
+        defer { updateDeviceInfoCount() }
+        let data: Data
+        do {
+            data = try BinaryEncoder.encode(deviceInfo)
+        } catch {
+            log.error("Failed to encode device info for storage: \(error)")
+            return false
+        }
+        return save(data: data, date: deviceInfo.time.date, in: "info")
+    }
+
+    @discardableResult
+    func saveTransferData(data: Data, date: Date) -> Bool {
+        defer { updateTransferCount() }
+        return save(data: data, date: date, in: "transfers")
     }
 }
 

TempTrack/TempTrackApp.swift

@@ -1,14 +1,19 @@
 import SwiftUI
 
-private let storage = PersistentStorage()
+let storage = PersistentStorage()
+
+private let scanner = BluetoothScanner()
+
+private let transfer = TransferHandler()
 
 @main
 struct TempTrackApp: App {
     
     var body: some Scene {
         WindowGroup {
-            ContentView()
+            ContentView(scanner: scanner)
                 .environmentObject(storage)
+                .environmentObject(transfer)
         }
     }
 }

TempTrack/Temperature/TemperatureSensor.swift

@@ -74,3 +74,7 @@ extension Data {
         return .init(address: address, valueByte: temperatureByte, secondsAgo: time)
     }
 }
+
+extension TemperatureSensor: Codable {
+    
+}

TempTrack/Views/DeviceInfoView.swift

@@ -45,7 +45,7 @@ struct DeviceInfoView: View {
     }
     
     private var nextUpdateText: String {
-        let secs = info.time.nextMeasurement.secondsToNow
+        let secs = -info.time.nextMeasurement.secondsToNow
         guard secs > 1 else {
             return "Now"
         }
@@ -101,6 +101,9 @@ struct DeviceInfoView: View {
                     IconAndTextView(
                         icon: .power,
                         text: "\(df.string(from: info.time.deviceStartTime)) (\(runTimeString))")
+                    IconAndTextView(
+                        icon: .touchid,
+                        text: "\(info.uniqueIdOfPowerCycle)")
                     IconAndTextView(
                         icon: .autostartstop,
                         text: "Wakeup: \(info.wakeupReason.text)")
@@ -124,6 +127,10 @@ struct DeviceInfoView: View {
                     IconAndTextView(
                         icon: .iphoneAndArrowForward,
                         text: "\(info.transferBlockSize) Byte Block Size")
+                    IconAndTextView(
+                        icon: .externaldriveBadgeCheckmark,
+                        text: String(format: "0x%02X 0x%02X",
+                                     UInt8(info.dataChecksum >> 8), UInt8( info.dataChecksum & 0xFF)))
                 }
                 sensorView(info.sensor0, id: 0)
                 sensorView(info.sensor1, id: 1)

TempTrack/Views/LogView.swift

@@ -12,9 +12,19 @@ struct LogView: View {
     @EnvironmentObject
     var log: Log
 
+    @EnvironmentObject
+    var storage: PersistentStorage
+
     var body: some View {
         NavigationView {
-            List(log.logEntries) { entry in
+            List {
+                Text("\(storage.numberOfStoredDeviceInfos) device infos")
+                    .font(.body)
+                    .foregroundColor(.secondary)
+                Text("\(storage.numberOfStoredTransfers) transfers")
+                    .font(.body)
+                    .foregroundColor(.secondary)
+                ForEach(log.logEntries) { entry in
                     VStack(alignment: .leading) {
                         HStack {
                             Text(entry.level.description)
@@ -24,6 +34,7 @@ struct LogView: View {
                         Text(entry.message)
                     }
                 }
+            }
             .navigationTitle("Log")
             .navigationBarTitleDisplayMode(.large)
         }

TempTrack/Views/TransferView.swift

@@ -8,24 +8,17 @@ struct TransferView: View {
 
     let bluetoothClient: BluetoothDevice
 
+    @Binding
+    var info: DeviceInfo?
+
     @EnvironmentObject
     var storage: PersistentStorage
 
-    @State
+    @EnvironmentObject
-    var bytesTransferred: Double = 0.0
+    var transfer: TransferHandler
-
-    @State
-    var totalBytes: Double = 0.0
-
-    @State
-    var measurements: [TemperatureMeasurement] = []
-
-    @State
-    var transferIsRunning = false
-
 
     private var storageIcon: SFSymbol {
-        guard let info = bluetoothClient.lastDeviceInfo else {
+        guard let info else {
             return .externaldrive
         }
         if info.storageSize - info.numberOfRecordedBytes < storageWarnBytes {
@@ -35,14 +28,14 @@ struct TransferView: View {
     }
 
     private var measurementsText: String {
-        guard let info = bluetoothClient.lastDeviceInfo else {
+        guard let info else {
             return "No measurements"
         }
         return "\(info.numberOfStoredMeasurements) measurements (\(info.time.totalNumberOfMeasurements) total)"
     }
 
     private var storageText: String {
-        guard let info = bluetoothClient.lastDeviceInfo else {
+        guard let info else {
             return "No data"
         }
         if info.storageSize <= 0 {
@@ -52,25 +45,25 @@ struct TransferView: View {
     }
 
     private var transferSizeText: String {
-        guard let info = bluetoothClient.lastDeviceInfo else {
+        guard let info else {
             return "No transfer size"
         }
         return "\(info.transferBlockSize) Byte Block Size"
     }
 
     private var transferByteText: String {
-        let total = Int(totalBytes)
+        let total = Int(transfer.totalBytes)
         guard total > 0 else {
             return "No data"
         }
-        return "\(Int(bytesTransferred)) / \(total) Bytes"
+        return "\(Int(transfer.bytesTransferred)) / \(total) Bytes"
     }
 
     private var transferMeasurementText: String {
-        guard !measurements.isEmpty else {
+        guard !transfer.measurements.isEmpty else {
             return "No measurements"
         }
-        return "\(measurements.count) measurements"
+        return "\(transfer.measurements.count) measurements"
     }
 
     var body: some View {
@@ -93,13 +86,13 @@ struct TransferView: View {
                 Button(action: clearStorage) {
                     Text("Remove recorded data")
                 }
-                .disabled(transferIsRunning)
+                .disabled(transfer.transferIsRunning)
                 .padding()
 
                 VStack(alignment: .leading, spacing: 5) {
                     Text("Transfer")
                         .font(.headline)
-                    ProgressView(value: bytesTransferred, total: totalBytes)
+                    ProgressView(value: transfer.bytesTransferred, total: transfer.totalBytes)
                         .progressViewStyle(.linear)
                         .padding(.vertical, 5)
                     IconAndTextView(
@@ -113,19 +106,19 @@ struct TransferView: View {
                     Button(action: transferData) {
                         Text("Transfer")
                     }
-                    .disabled(transferIsRunning)
+                    .disabled(transfer.transferIsRunning)
                     .padding()
                     Spacer()
                     Button(action: saveTransfer) {
                         Text("Save")
                     }
-                    .disabled(transferIsRunning || measurements.isEmpty)
+                    .disabled(transfer.transferIsRunning || transfer.measurements.isEmpty)
                     .padding()
                     Spacer()
                     Button(action: discardTransfer) {
                         Text("Discard")
                     }
-                    .disabled(transferIsRunning || measurements.isEmpty)
+                    .disabled(transfer.transferIsRunning || transfer.measurements.isEmpty)
                     .padding()
                 }
                 Spacer()
@@ -140,80 +133,22 @@ struct TransferView: View {
     }
 
     func transferData() {
-        guard let info = bluetoothClient.lastDeviceInfo else {
+        guard let info else {
             return
         }
-        transferIsRunning = true
+        transfer.startTransfer(from: bluetoothClient, with: info, storage: storage)
-        let total = info.numberOfRecordedBytes
-        let chunkSize = info.transferBlockSize
-        bytesTransferred = 0
-        totalBytes = Double(total)
-        Task {
-            defer {
-                DispatchQueue.main.async {
-                    self.transferIsRunning = false
-                }
-            }
-            var data = Data(capacity: total)
-            while data.count < total {
-                let remainingBytes = total - data.count
-                let currentChunkSize = min(remainingBytes, chunkSize)
-                guard let chunk = await bluetoothClient.getDeviceData(offset: data.count, count: currentChunkSize) else {
-                    log.warning("Failed to finish transfer")
-                    return
-                }
-                data.append(chunk)
-                DispatchQueue.main.async {
-                    self.bytesTransferred = Double(data.count)
-                }
-            }
-
-            DispatchQueue.main.async {
-                self.bytesTransferred = totalBytes
-            }
-
-            var measurementCount = 0
-            let recordingStart = info.currentMeasurementStartTime
-            while !data.isEmpty {
-                let byte = data.removeFirst()
-                guard (byte == 0xFF) else {
-                    log.error("Expected 0xFF at index \(total - data.count - 1)")
-                    break
-                }
-                guard data.count >= 2 else {
-                    log.error("Expected two more bytes after index \(total - data.count - 1)")
-                    break
-                }
-                let temp0 = TemperatureValue(byte: data.removeFirst())
-                let temp1 = TemperatureValue(byte: data.removeFirst())
-                let date = recordingStart
-                    .addingTimeInterval(TimeInterval(measurementCount * info.measurementInterval))
-                let measurement = TemperatureMeasurement(
-                    sensor0: temp0,
-                    sensor1: temp1,
-                    date: date)
-                measurementCount += 1
-                DispatchQueue.main.async {
-                    self.measurements.append(measurement)
-                }
-            }
-        }
     }
 
     func discardTransfer() {
-        self.measurements = []
+        transfer.discardTransfer()
-        self.bytesTransferred = 0
-        self.totalBytes = 0
     }
 
     func saveTransfer() {
-        // TODO: Save
+        transfer.saveTransfer(in: storage)
-
-        discardTransfer()
     }
 
     func clearStorage() {
-        guard let byteCount = bluetoothClient.lastDeviceInfo?.numberOfRecordedBytes else {
+        guard let byteCount = info?.numberOfRecordedBytes else {
             return
         }
         Task {
@@ -229,7 +164,7 @@ struct TransferView: View {
 struct TransferView_Previews: PreviewProvider {
     static var previews: some View {
         let storage = PersistentStorage(lastMeasurements: TemperatureMeasurement.mockData)
-        TransferView(bluetoothClient: .init())
+        TransferView(bluetoothClient: .init(), info: .constant(.mock))
             .environmentObject(storage)
     }
 }