Use PlatformIO, fix EEPROM, send key index

platformio.ini

@@ -0,0 +1,18 @@
+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:az-delivery-devkit-v4]
+platform = espressif32
+board = az-delivery-devkit-v4
+framework = arduino
+lib_deps = 
+	links2004/WebSockets@^2.3.7
+	madhephaestus/ESP32Servo@^0.11.0
+monitor_speed = 115200

src/main.cpp

@@ -13,9 +13,15 @@
 #include <EEPROM.h> // To mark used keys as expired
 #include <ESP32Servo.h> // To control the servo
 
+// TODO: 
+// - Handle WiFi disconnect
+// - Implement key sharing
+// - Configure/diagnose over Bluetooth?
 
 /* Settings */
 
+#define SERIAL_BAUD_RATE 115200
+
 // The WiFi network to connect to
 constexpr const char* WIFI_SSID = "MyNetwork";
 constexpr const char* WIFI_PWD = "MyPassword";
@@ -60,10 +66,10 @@ constexpr int servoPin = 14;
 constexpr int servoFrequency = 50;
 
 // The microseconds to set the servo to the pressed state
-constexpr int PRESS_STATE_INTERVAL = 1550;
+constexpr int PRESS_STATE_INTERVAL = 1600;
 
 // The microseconds to set the servo to the released state
-constexpr int RELEASE_STATE_INTERVAL = 1700;
+constexpr int RELEASE_STATE_INTERVAL = 1520;
 
 
 /* Global variables */
@@ -131,7 +137,7 @@ uint16_t indexOfNextUsableKey();
  * @param keyIndex The index of the key in the 'keys' array.
  * @return 0, if the key is unused, else non-zero.
  */
-uint8_t keyWasAlreadyUsed(uint16_t keyIndex);
+bool keyWasAlreadyUsed(uint16_t keyIndex);
 
 /**
  * Marks a key as used
@@ -155,7 +161,7 @@ void markAllKeysUnused();
  * Compares two keys in constant time
  * @return 1, if the keys are equal, else 0
  */
-uint8_t keysAreEqual(const uint8_t* key1, const uint8_t* key2);
+bool keysAreEqual(const uint8_t* key1, const uint8_t* key2);
 
 
 /* Servo management */
@@ -174,15 +180,17 @@ void releaseButton();
 /* Logic */
 
 /**
- * Send a response event to the server.
+ * Send a response event to the server and include the next key index.
  *
- * Sends the event type as a single byte representing the raw event type.
+ * Sends the event type as three byte.
  * @param event The event type
  */
 void sendResponse(SesameEvent event) {
-    uint8_t response[1];
+    uint8_t response[3];
     response[0] = static_cast<uint8_t>(event);
-    webSocket.sendBIN(response, 1);
+    response[1] = nextKeyIndex >> 8;
+    response[2] = nextKeyIndex & 0xFF;
+    webSocket.sendBIN(response, 3);
     //webSocket.sendTXT(text);
     Serial.printf("[INFO] Event %d\n", response[0]);
 }
@@ -214,7 +222,7 @@ SesameEvent handleReceivedRequest(const uint8_t* payload, size_t length) {
         return SesameEvent::InvalidKeyIndex;
     }
     if (!keysAreEqual(payload + 2, keys[keyIndex])) {
-        return SesameEvent::InvalidKeyIndex;
+        return SesameEvent::InvalidKey;
     }
     if (keyWasAlreadyUsed(keyIndex)) {
         return SesameEvent::KeyAlreadyUsed;
@@ -226,6 +234,7 @@ SesameEvent handleReceivedRequest(const uint8_t* payload, size_t length) {
     nextKeyIndex = keyIndex + 1;
     // Move servo
     shouldStartOpening = true;
+    Serial.printf("[Info] Used key %d\n", keyIndex);
     return SesameEvent::KeyAccepted;
 }
 
@@ -271,6 +280,8 @@ void webSocketEvent(WStype_t type, uint8_t * payload, size_t length) {
         case WStype_BIN:
             processReceivedBytes(payload, length);
             break;
+        case WStype_PONG:
+        case WStype_PING:
         case WStype_ERROR:
         case WStype_FRAGMENT_TEXT_START:
         case WStype_FRAGMENT_BIN_START:
@@ -286,12 +297,13 @@ void setup() {
     Serial.setDebugOutput(true);
     Serial.println("[INFO] Device started");
 
-    markAllKeysUnused();
+    //markAllKeysUnused();
-    Serial.println("[WARN] All keys reset");
+    //Serial.println("[WARN] All keys reset");
     
     ESP32PWM::allocateTimer(pwmTimer);
     servo.setPeriodHertz(servoFrequency);
     servo.attach(servoPin);
+    releaseButton();
     Serial.println("[INFO] Servo configured");
     
     Serial.printf("[INFO] Key security: %d bit (%d byte keys)\n", KEY_STRENGTH, KEY_BYTE_COUNT);
@@ -306,17 +318,22 @@ void setup() {
     }
 
     Serial.println("[INFO] WiFi connected");
-    Serial.printf("[INFO] Opening socket %s%s on port %d\n", SERVER_URL, SERVER_PATH, SERVER_PORT);
+    
-
     #ifdef USE_SSL
+    Serial.printf("[INFO] Opening SSL socket %s%s on port %d\n", SERVER_URL, SERVER_PATH, SERVER_PORT);
     webSocket.beginSSL(SERVER_URL, SERVER_PORT, SERVER_PATH);
     #else
+    Serial.printf("[INFO] Opening insecure socket %s%s on port %d\n", SERVER_URL, SERVER_PATH, SERVER_PORT);
     webSocket.begin(SERVER_URL, SERVER_PORT, SERVER_PATH);
     #endif
     webSocket.onEvent(webSocketEvent);
     
     // try again every 5000 ms if connection has failed
     webSocket.setReconnectInterval(SOCKET_RECONNECT_TIME);
+
+    // Creates an EEPROM fake in RAM, which is committed to flash
+    // The RAM data can be released by calling `EEPROM.end()`
+    EEPROM.begin(KEY_COUNT);
 }
 
 void loop() {
@@ -345,29 +362,31 @@ uint16_t indexOfNextUsableKey() {
     return 0;
 }
 
-uint8_t keyWasAlreadyUsed(uint16_t keyIndex) {
+bool keyWasAlreadyUsed(uint16_t keyIndex) {
-    return EEPROM.read(keyIndex);
+    return EEPROM.read(keyIndex) > 0;
 }
 
 void markKeyUsed(uint16_t keyIndex) {
     EEPROM.write(keyIndex, 1);
+    EEPROM.commit();
 }
 
 void markAllKeysUnused() {
     for (uint16_t keyIndex = 0; keyIndex < KEY_COUNT; keyIndex += 1) {
         EEPROM.write(keyIndex, 0);
     }
+    EEPROM.commit();
 }
 
-uint8_t keysAreEqual(const uint8_t* key1, const uint8_t* key2) {
+bool keysAreEqual(const uint8_t* key1, const uint8_t* key2) {
     uint8_t result = 0;
     for (uint8_t i = 0; i < KEY_BYTE_COUNT; i += 1) {
         result |= key1[i] ^ key2[i];
     }
     if (result) {
-        return 0;
+        return false;
     }
-    return 1;
+    return true;
 }
 
 /* Servo management */