In this example, the device connects to a Wi-Fi network and to an Mqtt server with the following parameters:

const char *wifissid = "";
const char *WifiPassword = "";
const char *mqttServer = "";
const char *mqttUser = "";
const char *mqttPassword = "";
const char *publishTopic = "";
const char *subscribeTopic = "";
const int mqttPort = 1883;

If your Mqtt server doesn't ask for username or password, you can leave the spaces empty const char *mqttUser = "" and const char *mqttPassword = "".

• If the device exceeds the number of wifi connection attempts wifiConnectionAttempts = 30, it will continue to work and try to connect every 20 seconds wifi Loop().

• If the device loses connection to the Mqtt server, it will try to connect every 30 seconds unsigned int intervalMqtt = 30000.

• When the #define PUBLISH_BUTTON 0 button is pressed, it sends the server the network name wifiSSID, the channel wifiChannel, the received signal strength indicator wifiDbm, the connection quality percentage wifiPercent and the internal temperature of the cpu tempCpu.

• A través de un cliente Mqtt, encienda o apague el led #define MQTT_LED 2 como se muestra en los ejemplos.

Subscribe example:

• To turn on the led

{
  "command": "led",
  "value": "on"
}

• To turn off the led

{
  "command": "led",
  "value": "off"
}

Publish example:

{
  "wifiSSID": "The name of your Wi-Fi network",
  "wifiChannel": 11,
  "wifiDbm": "-72",
  "wifiPercent": "56",
  "tempCpu": 57
}