I’m encountering an issue while using the LoRaWAN EU868 RAK3172(H). I created a program to read temperature data using a KMeterISO sensor in UIFlow2, which works perfectly with the older and simpler LoRaWAN868 ASR6501. However, when I switched to the RAK module and updated the configuration in the "Unit" section of UIFlow2, I encountered the following error: AttributeError: LoRaWANUnit_RUI3
This error appears to come from a library that is automatically added when I configure the RAK module's pins.

While searching for a solution, I visited the product's documentation page:

• https://docs.m5stack.com/en/unit/Unit LoRaWAN-EU868
  There, it states that UIFlow1 and UIFlow2 support is coming soon — meaning it’s not currently available.

As a result, I decided to switch to the Arduino IDE. I downloaded the appropriate library and attempted to run an example program, but even the basic example fails to work with this module, i got stuck in the 1st while loop.

According to the official documentation, the library to use is the one following :

• https://github.com/m5stack/M5-LoRaWAN-RAK

The example I tried to compile was:
Examples > LoRaWAN > OTAA,
with the correct pin configuration and OTAA identification (DevEUI, AppEUI, AppKey).

So i try on my own a program but here again, i got stuck in the 1st while loop again. Here's the program that i can compile but not working (I know the OTAA identification is not submit here) :

#include <Wire.h>
#include <M5Unified.h>
#include <M5UnitKmeterISO.h>
#include "rak3172_lorawan.hpp"
#include <string.h>

RAK3172LoRaWAN lorawan;
M5UnitKmeterISO kmeter;

// Définir les paramètres OTAA
#define DEVEUI ""
#define APPEUI ""
#define APPKEY "*********"

// Déclaration des broches pour LoRa
#define TX 15
#define RX 13

void joinCallback(bool status)
{
if (status) {
Serial.println("[LoRaWAN] Join réseau réussi !");
} else {
Serial.println("[LoRaWAN] Échec de la jonction !");
}
}

void sendCallback()
{
Serial.println("[LoRaWAN] Envoi confirmé par le serveur");
}

void errorCallback(char* error)
{
Serial.print("[LoRaWAN] Erreur : ");
Serial.println(error);
}

void setup() {
M5.begin();
Serial.begin(115200);

// Initialisation du capteur KMeterISO
Wire.begin(9, 7);  // Utilisation des broches spécifiques pour I2C (SCL, SDA)
while (!kmeter.begin(&Wire, KMETER_DEFAULT_ADDR)) {
    Serial.println("Capteur KMeterISO non trouvé !");
    delay(1000);  // Attente avant de réessayer
}
Serial.println("Capteur KMeterISO initialisé.");

// Initialisation du module LoRaWAN
while (!lorawan.init(&Serial2, RX, TX, RAK3172_BPS_115200)) {
    Serial.println("[Init] Failed to initialize module, retrying...");
    delay(1000);
}
Serial.println("Module LoRaWAN initialisé.");

// Configuration LoRaWAN
lorawan.onJoin(joinCallback);
lorawan.onSend(sendCallback);
lorawan.onError(errorCallback);

// Configurer OTAA
lorawan.setOTAA(DEVEUI, APPEUI, APPKEY);

// Tentative de jonction au réseau LoRaWAN
if (lorawan.join(true, false, 10, 10)) {
    Serial.println("Start Join...");
} else {
    Serial.println("Join Fail");
}

// Configuration du mode LoRaWAN
lorawan.setMode(CLASS_A);
lorawan.setLinkCheck(ALLWAYS_LINKCHECK);
lorawan.setDR(4);  // Data Rate DR4

Serial.println("Initialisation terminée.");

}

void loop() {
M5.update();

// Lire la température du capteur KMeterISO
float temp = kmeter.getCelsiusTempValue() / 100.0;
Serial.printf("Température du capteur: %.2f °C\n", temp);

// Préparer le message à envoyer
String message = "Temp: " + String(temp, 2) + " °C";

// Envoyer le message via LoRaWAN
if (lorawan.send(message)) {
    Serial.println("Données envoyées avec succès !");
} else {
    Serial.println("Échec de l'envoi des données.");
}

delay(15000);  // Attente de 15 secondes avant de lire et envoyer à nouveau

}