Help with mqtt (maybe something else)

Projects Programming
1

Hi All,
Need your help once more.
I had a perfect working sketch, everything working.
Made a bad connection and fried my ESP :frowning:
I bought a new one, is a esp32-s2-saola-1.

I think this problem is something else than mqtt, but can't figure what!!
The sketch below is working fine, but only because the server is local. Any server I try outside my network doesn't work, just keep trying.

It's driving me crazy ... again :slight_smile:

Here's the code:

////////////////////////////
//INCLUDE
#include "libs.h"

///////////////////////////
// Add your MQTT Broker IP address, example:
//=======================================================================
//                   START MQTT SERVER
//=======================================================================
const char* mqtt_server = "192.168.121.22";
const char* mqtt_name = "WeatherStation";
const char* mqtt_weather = "weather/#";
const char* mqtt_tasmota = "stat/tasmota_xxxxx/POWER";
const char* mqttuser = "xxxxxxxx";
const char* mqttpass = "xxxxxxxxxxx";
const int mqttPort = 1883;
WiFiClient wifiClient;
PubSubClient client(mqtt_server, mqttPort, wifiClient);
long timeToReconnect = 0;
String rxString = "";
String mqttComando;
//long timerRequest;
String mqttReqst;
//Mqtt
const long intervalleitura = 4000;  //4 Seg entre leituras e envio ao mqtt e LCD
unsigned long previousMillisleitura = 0;
String mqttmess = "";

//=======================================================================
//                    MQTT CALLBACK
//=======================================================================
void callback(char* mqtt_topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(mqtt_topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) rxString += (char)payload[i];
  Serial.print("(");
  Serial.print(rxString);
  Serial.println(")");
  rxString = "";
  mqttComando = mqtt_topic;
}

void connectMosquitto() {
  client.setServer(mqtt_server, mqttPort);
  client.setCallback(callback);
  Serial.println("");
  Serial.println("Conecting MOSQUITTO Broker...");
  if (client.connect(mqtt_name, mqttuser, mqttpass)) {
    Serial.println("Connected to MOSQUITTO Broker!");
    Serial.println("");
    Serial.print("I have subscribe ");
    Serial.print(mqtt_weather); Serial.print(" e "); Serial.print(mqtt_tasmota);
    client.subscribe(mqtt_weather);
    client.subscribe(mqtt_tasmota);
    client.publish("weather", "ola do esp32");
  } else {
    Serial.println("Connection to MOSQUITTO  Broker failed. , i will try again...");
    timeToReconnect = millis() + 5000;
  }
}
//////////////////// SETUP ////////////////
void setup() {

  //Serial
  Serial.begin(115200);
  ///////////////////////////
  //Wifi
  if (!WiFi.config(local_IP, gateway, subnet, primaryDNS, secondaryDNS)) Serial.println("STA Failed to configure");
  WiFi.begin(ssid, password);
  delay(1000);

  //BROKER
  connectMosquitto();

//OTA
#include "ota.h"
  ///////////////////////////

}
//////////////////// LOOP ////////////////
void loop() {

  ///////////////////////////////////////
  //MOSQUITTO
  client.loop();
  if (client.state() != 0 && timeToReconnect < millis() && WiFi.status() == WL_CONNECTED) {
    connectMosquitto();
  }
  client.loop();

  //OTA
  ArduinoOTA.handle();
}

More info: I can ping the ESP, OTA is working fine.

I'll apreciate any help.

2

Please post your sketch here, using < CODE/ > tags when you do

3

It's a link to Pastebin, is not Ok ?!

4

I know what it is. Better to post it here to make it easier to access and copy to examine

5

Done. Thank you.

6

One possibility is that the MAC address is not being allowed through on the router.

Look at the router logs to see why/if a connection is being refused.

7

Thank you. But I have wifi. I can ping ESP IP address, I can flash with OTA.

8

can the esp32 ping?

9

Wierd,
Can ping local IP.
My broker IP
Mosquitto IP

This is mosquitto IP

Connecting to WiFi
.
WiFi connected with ip 192.168.121.110
Pinging ip 85.119.83.194
Success!!
10

You've lead me to the solution.
I've binded MAC address to IP with previous ESP. So I can't use the same IP. I was using fixed IP.
Now it's easy to fix.
Thank you.

1 Like
11

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