406 lines
13 KiB
Swift
406 lines
13 KiB
Swift
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
|
|
}
|
|
}
|
|
*/
|