feat: add nonces persistence across reboot

src/lora.cpp

@@ -2,11 +2,16 @@
 
 #include <SPI.h>
 #include <RadioLib.h>
+#include <Preferences.h>
 
+Preferences prefs;
 SX1276 radio = new Module(LORA_NSS, LORA_DIO0, LORA_RST, LORA_DIO1);
 LoRaWANNode node(&radio, &EU868);
 
-void loraReset() {
+uint8_t noncesBuffer[RADIOLIB_LORAWAN_NONCES_BUF_SIZE];
+
+void loraReset()
+{
     pinMode(LORA_RST, OUTPUT);
     digitalWrite(LORA_RST, LOW);
     delay(10);
@@ -14,36 +19,84 @@ void loraReset() {
     delay(10);
 }
 
-void loraInit() {
+void loraInit()
+{
     loraReset();
     SPI.begin(LORA_SCK, LORA_MISO, LORA_MOSI, LORA_NSS);
 
     Serial.print("[LoRa] Init... ");
     int state = radio.begin();
-    if (state != RADIOLIB_ERR_NONE) {
+    if (state != RADIOLIB_ERR_NONE)
+    {
         Serial.printf("ERREUR %d\n", state);
-        while (true) { delay(1000); }
+        while (true)
+        {
+            delay(1000);
+        }
     }
     Serial.println("OK");
 }
 
-void loraJoin(){
+void loraRestoreDevNonce()
+{
+    prefs.begin("lorawan");
+    size_t len = prefs.getBytesLength("nonces");
+
+    if (len == RADIOLIB_LORAWAN_NONCES_BUF_SIZE)
+    {
+        prefs.getBytes("nonces", noncesBuffer, RADIOLIB_LORAWAN_NONCES_BUF_SIZE);
+    }
+    else
+    {
+        Serial.println("[NVS] Aucune donnée trouvée, buffer initialisé à zéro");
+        memset(noncesBuffer, 0, RADIOLIB_LORAWAN_NONCES_BUF_SIZE);
+    }
+    prefs.end();
+
+    node.setBufferNonces(noncesBuffer);
+}
+
+void loraPersistDevNonce()
+{
+    prefs.begin("lorawan");
+    uint8_t buffer[RADIOLIB_LORAWAN_NONCES_BUF_SIZE];
+    uint8_t *persist = node.getBufferNonces();
+    memcpy(buffer, persist, RADIOLIB_LORAWAN_NONCES_BUF_SIZE);
+
+    size_t result = prefs.putBytes("nonces", buffer, RADIOLIB_LORAWAN_NONCES_BUF_SIZE);
+
+    prefs.end();
+}
+
+void loraJoin()
+{
     node.beginOTAA(joinEUI, devEUI, nwkKey, appKey);
-    
+    loraRestoreDevNonce();
+
     Serial.print("[LoRaWAN] Join... ");
     int state = node.activateOTAA();
-    if (state != RADIOLIB_LORAWAN_NEW_SESSION) {
+    loraPersistDevNonce();
+    if (state != RADIOLIB_LORAWAN_NEW_SESSION)
+    {
         Serial.printf("Echec : %d\n", state);
-        while (true) { delay(1000); }
+        while (true)
+        {
+            delay(1000);
+        }
     }
+
     Serial.println("Join OK !");
 }
 
-void loraSend(uint8_t payload[], size_t size){
+void loraSend(uint8_t payload[], size_t size)
+{
     int state = node.sendReceive(payload, size, 1);
-    if (state == RADIOLIB_ERR_NONE || state == RADIOLIB_LORAWAN_NO_DOWNLINK) {
+    if (state == RADIOLIB_ERR_NONE || state == RADIOLIB_LORAWAN_NO_DOWNLINK)
+    {
         Serial.println("[TX] OK");
-    } else {
+    }
+    else
+    {
         Serial.printf("[TX] Erreur : %d\n", state);
     }
 }

src/lora.h

@@ -7,5 +7,7 @@ void loraReset();
 void loraInit();
 void loraJoin();
 void loraSend(uint8_t payload[], size_t size);
+void loraPersistDevNonce();
+void loraSaveDevNonce();
 
 #endif