feat: improve error management to avoid infinite loop

The device goes in deep sleep after 3 restarts when connection is not
successful

lib/Transmitter/ITransmitter.h

@@ -2,10 +2,17 @@
 #include <stdint.h>
 #include <stddef.h>
 
+enum class TransmitError : int16_t {
+    OK           =  0,
+    INIT_FAILED  = -1,
+    JOIN_FAILED  = -2,
+    SEND_FAILED  = -3,
+};
+
 class ITransmitter {
 public:
     virtual ~ITransmitter() = default;
-    virtual void init() = 0;
-    virtual void join() = 0;
-    virtual void send(uint8_t* payload, size_t size) = 0;
+    virtual TransmitError init() = 0;
+    virtual TransmitError join() = 0;
+    virtual TransmitError send(uint8_t* payload, size_t size) = 0;
 };

lib/Transmitter/LoRaTransmitter.cpp

@@ -18,7 +18,7 @@ LoRaTransmitter::LoRaTransmitter(
     memset(_noncesBuffer, 0, RADIOLIB_LORAWAN_NONCES_BUF_SIZE);
 }
 
-void LoRaTransmitter::init()
+TransmitError LoRaTransmitter::init()
 {
     _reset();
     SPI.begin(LORA_SCK, LORA_MISO, LORA_MOSI, LORA_NSS);
@@ -28,15 +28,13 @@ void LoRaTransmitter::init()
     if (state != RADIOLIB_ERR_NONE)
     {
         Serial.printf("ERREUR %d\n", state);
-        while (true)
-        {
-            delay(1000);
-        }
+        return TransmitError::INIT_FAILED;
     }
     Serial.println("OK");
+    return TransmitError::OK;
 }
 
-void LoRaTransmitter::join()
+TransmitError LoRaTransmitter::join()
 {
     int16_t state = RADIOLIB_ERR_NETWORK_NOT_JOINED;
 
@@ -50,29 +48,31 @@ void LoRaTransmitter::join()
         if (state != RADIOLIB_LORAWAN_NEW_SESSION)
         {
             Serial.printf("Echec : %d\n", state);
-            while (true)
-            {
-                delay(1000);
-            }
+            return TransmitError::JOIN_FAILED;
         }
     }
 
     Serial.println("OK");
     _saveSession();
+    return TransmitError::OK;
 }
 
-void LoRaTransmitter::send(uint8_t payload[], size_t size)
+TransmitError LoRaTransmitter::send(uint8_t payload[], size_t size)
 {
     int state = _node.sendReceive(payload, size, 1);
     if (state == RADIOLIB_ERR_NONE || state == RADIOLIB_LORAWAN_NO_DOWNLINK)
     {
         Serial.println("[TX] OK");
+        _saveSession();
+        return TransmitError::OK;
     }
     else
     {
         Serial.printf("[TX] Erreur : %d\n", state);
+        _saveSession();
+        return TransmitError::SEND_FAILED;
     }
-    _saveSession();
+
 }
 
 void LoRaTransmitter::_reset()

lib/Transmitter/LoRaTransmitter.h

@@ -22,9 +22,9 @@ public:
         uint8_t* appKey
     );
 
-    void init()                              override;
-    void join()                              override;
-    void send(uint8_t* payload, size_t size) override;
+    TransmitError init()                              override;
+    TransmitError join()                              override;
+    TransmitError send(uint8_t* payload, size_t size) override;
 
 private:
     uint64_t _joinEUI;

src/config.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#define MAX_RESTART 3
+
 uint64_t joinEUI = 0x35f48318e1324e2e;
 uint64_t devEUI = 0x0586fe41112d83d9;
 uint8_t appKey[] = {

src/main.cpp

@@ -2,6 +2,8 @@
 #include "LoRaTransmitter.h"
 #include "config.h"
 
+RTC_DATA_ATTR uint8_t restartCount = 0;
+
 ITransmitter* transmitter = new LoRaTransmitter(
     joinEUI,
     devEUI,
@@ -9,12 +11,34 @@ ITransmitter* transmitter = new LoRaTransmitter(
     appKey
 );
 
+void fatalError(const char* msg){
+    Serial.printf("[FATAL] %s\n", msg);
+    Serial.flush();
+    delay(100);
+
+    if (restartCount < MAX_RESTART) {
+        restartCount++;
+        Serial.printf("[FATAL] Redémarrage %d/3\n", restartCount);
+        Serial.flush();
+        ESP.restart();
+    }
+
+    Serial.printf("[FATAL] %d redémarrages : l'appareil entre en sommeil profond permanent\n", MAX_RESTART);
+    Serial.flush();
+    esp_deep_sleep_start();
+}
+
 void setup() {
     Serial.begin(115200);
     delay(2000);
     
-    transmitter->init();
-    transmitter->join();
+    if (transmitter->init() != TransmitError::OK){
+        fatalError("Initialisation du périphérique radio échouée");
+    }
+    if (transmitter->join() != TransmitError::OK){
+        fatalError("Connexion au concentrateur LoRaWAN échouée");
+    }
+    restartCount = 0;
 }
 
 void loop() {