Getting started with uMQTTBroker

We based the broker for our project as the example given by the professor. We have the libraries used by them at the libraries folder.

Regard the Example

The example was slightly modified. It usually returned just a counter, and printed by terminal the number of clients. As we had our NodeMCU connected directly to a source of electricity and not a computer for developing both dataproducers, we modified it so instead of printing the counter, it just prints the number of clients.

Also, we used a channel for debugging purposes, and both ESP01 send the data to debug at this channels, which makes it easier to know what is happening at them at all times.

Code

/*
   uMQTTBroker demo for Arduino

   Minimal Demo: the program simply starts a broker and waits for any client to connect.
*/

#include <ESP8266WiFi.h>
#include "uMQTTBroker.h"

uMQTTBroker myBroker;

/*
   Your WiFi config here
*/
char ssid[] = "ssid";      // your network SSID (name)
char pass[] = "password"; // your network password


int counter = 0;


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


  WiFi.softAP(ssid, pass);
  Serial.println("AP started");
  Serial.println("IP address: " + WiFi.softAPIP().toString());

  // Start the broker
  Serial.println("Starting MQTT broker");
  myBroker.init();

  myBroker.subscribe("#");
}

char str[80];

void loop() {
  sprintf(str, "Clients: %d", myBroker.getClientCount());
  myBroker.publish("broker/clients", str);
  // wait a second
  delay(1000);
}