/***************************************************
Adafruit MQTT Library ESP8266 Example
Must use ESP8266 Arduino from:
https://github.com/esp8266/Arduino
Works great with Adafruit's Huzzah ESP board & Feather
----> https://www.adafruit.com/product/2471
----> https://www.adafruit.com/products/2821
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Tony DiCola for Adafruit Industries.
MIT license, all text above must be included in any redistribution
****************************************************/
#include <WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"
/************************* WiFi Access Point *********************************/
#define WLAN_SSID "Wokwi-GUEST"
#define WLAN_PASS ""
/************************* Adafruit.io Setup *********************************/
#define AIO_SERVER "io.adafruit.com"
#define AIO_SERVERPORT 1883 // use 8883 for SSL
#define AIO_USERNAME "a2nr"
#define AIO_KEY "aio_zkPc12IE7c9O97vrTHF26xm2965P"
/************ Global State (you don't need to change this!) ******************/
// Create an ESP8266 WiFiClient class to connect to the MQTT server.
WiFiClient client;
// or... use WiFiClientSecure for SSL
//WiFiClientSecure client;
// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_KEY);
/****************************** Feeds ***************************************/
// Setup a feed called 'photocell' for publishing.
// Notice MQTT paths for AIO follow the form: <username>/feeds/<feedname>
Adafruit_MQTT_Publish switch1 = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/switch1");
Adafruit_MQTT_Publish analog1 = Adafruit_MQTT_Publish(&mqtt, AIO_USERNAME "/feeds/analog1");
// Setup a feed called 'onoff' for subscribing to changes.
Adafruit_MQTT_Subscribe onoff = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/feeds/onoff");
/*************************** Sketch Code ************************************/
#define PIN_LED1 13
#define PIN_SWITCH1 16
#define PIN_ANALOG 34
// Bug workaround for Arduino 1.6.6, it seems to need a function declaration
// for some reason (only affects ESP8266, likely an arduino-builder bug).
void MQTT_connect();
void setup() {
Serial.begin(115200);
pinMode(PIN_LED1, OUTPUT);
pinMode(PIN_SWITCH1, INPUT_PULLUP);
delay(10);
Serial.println(F("Adafruit MQTT demo"));
// Connect to WiFi access point.
Serial.println(); Serial.println();
Serial.print("Connecting to ");
Serial.println(WLAN_SSID);
WiFi.begin(WLAN_SSID, WLAN_PASS);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println();
Serial.println("WiFi connected");
Serial.println("IP address: "); Serial.println(WiFi.localIP());
// Setup MQTT subscription for onoff feed.
mqtt.subscribe(&onoff);
}
void loop() {
// Ensure the connection to the MQTT server is alive (this will make the first
// connection and automatically reconnect when disconnected). See the MQTT_connect
// function definition further below.
MQTT_connect();
// this is our 'wait for incoming subscription packets' busy subloop
// try to spend your time here
Adafruit_MQTT_Subscribe *subscription;
while ((subscription = mqtt.readSubscription(5000))) {
if (subscription == &onoff) {
char * status_onoff = (char *)onoff.lastread;
Serial.print(F("Got: "));
Serial.println(status_onoff);
if(*status_onoff == '1'){
digitalWrite(PIN_LED1, HIGH);
} else {
digitalWrite(PIN_LED1, LOW);
}
}
}
// Now we can publish stuff!
Serial.print(F("\nSending switch1 "));
Serial.print("...");
uint32_t sw1 = digitalRead(PIN_SWITCH1);
if (! switch1.publish(sw1)) {
Serial.println(F("Failed"));
} else {
Serial.println(F("OK!"));
}
Serial.print(F("\nSending analog1 "));
Serial.print("...");
uint32_t a1 = analogRead(PIN_ANALOG);
if (! analog1.publish(a1)) {
Serial.println(F("Failed"));
} else {
Serial.println(F("OK!"));
}
// ping the server to kee0p the mqtt connection alive
// NOT required if you are publishing once every KEEPALIVE seconds
/*
if(! mqtt.ping()) {
mqtt.disconnect();
}
*/
}
// Function to connect and reconnect as necessary to the MQTT server.
// Should be called in the loop function and it will take care if connecting.
void MQTT_connect() {
int8_t ret;
// Stop if already connected.
if (mqtt.connected()) {
return;
}
Serial.print("Connecting to MQTT... ");
uint8_t retries = 3;
while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
Serial.println(mqtt.connectErrorString(ret));
Serial.println("Retrying MQTT connection in 5 seconds...");
mqtt.disconnect();
delay(5000); // wait 5 seconds
retries--;
if (retries == 0) {
// basically die and wait for WDT to reset me
while (1);
}
}
Serial.println("MQTT Connected!");
}