Lora to MQTT Server based Heltec V2

Gateways
1

Hello @ all

I need to manage a Gateway to receive Data over Lora and paste it to my own MQTT Broker for use the Data in Homeassistant. I think that is not only for me useful so maybe some of you are interested too in doing this :slight_smile:

At the Moment I have copy and paste 2 codes together but it sends not the right infos to my broker I think it s only a little problem in the code but I see it not :confused: maybe some of you see it faster because you look the code first. time and not like me every day :smiley:

I want to let the code simple and little as possible because I don’t want to mess up with many libraries and stuff I don’t need for this “simple” read and past code.

Here is the gateway code :

/*
  SimpleMQTTClient.ino
  The purpose of this exemple is to illustrate a simple handling of MQTT and Wifi connection.
  Once it connects successfully to a Wifi network and a MQTT broker, it subscribe to a topic and send a message to it.
  It will also send a message delayed 5 seconds later.
*/

#include "EspMQTTClient.h"

#include <SPI.h>
#include <LoRa.h>

#define PIN_NSS   18
#define PIN_RESET  14
#define PIN_DIO0   26


EspMQTTClient client(
  "...",
  "...",
  "192.168.2.200",  // MQTT Broker server ip
  "MQTT",   // Can be omitted if not needed
  "...",   // Can be omitted if not needed
  "TestClient",     // Client name that uniquely identify your device
  1883              // The MQTT port, default to 1883. this line can be omitted
);

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

   LoRa.setPins(PIN_NSS, PIN_RESET, PIN_DIO0);

  while (!LoRa.begin(866E6)) {
    Serial.print(".");
    delay(500);
  }

  LoRa.setSyncWord(0xC6);
  Serial.println("[OK]");

  // Optionnal functionnalities of EspMQTTClient : 
  client.enableDebuggingMessages(); // Enable debugging messages sent to serial output
  client.enableHTTPWebUpdater(); // Enable the web updater. User and password default to values of MQTTUsername and MQTTPassword. These can be overrited with enableHTTPWebUpdater("user", "password").
  client.enableLastWillMessage("TestClient/lastwill", "I am going offline");  // You can activate the retain flag by setting the third parameter to true
}

// This function is called once everything is connected (Wifi and MQTT)
// WARNING : YOU MUST IMPLEMENT IT IF YOU USE EspMQTTClient
void onConnectionEstablished()
{
  // Subscribe to "mytopic/test" and display received message to Serial
  client.subscribe("mytopic/test", [](const String & payload) {
    Serial.println(payload);
  });

  // Subscribe to "mytopic/wildcardtest/#" and display received message to Serial
  client.subscribe("mytopic/wildcardtest/#", [](const String & topic, const String & payload) {
    Serial.println("(From wildcard) topic: " + topic + ", payload: " + payload);
  });

  // Publish a message to "mytopic/test"
 // client.publish("mytopic/test", "This is a message"); // You can activate the retain flag by setting the third parameter to true

 
}

void loop()  {

   int packetSize = LoRa.parsePacket();
   
  if (packetSize) {
    Serial.print("Received packet: ");

    while (LoRa.available()) {
      Serial.print(LoRa.readString());
      client.publish("mytopic/heltec", LoRa.readString());
    }

    Serial.println(" (RSSI = " + String(LoRa.packetRssi()) + ")");
  }
  
  client.loop();
}

Notice: Please know ! Its NOT for act over TTN it is simple gateway only here for Lora packet like from the Sandeep Mistry send over a node then receive by this gateway build for heltec V2 board and parse over wifi to a MQTT Broker .

Hope somebody see my failure and maybe other can use this code too for there plans and stuff.

regards from Germany
Marc

2

If it is not TTN related this is not the right forum.