ESP8266MQTTNeopixel.ino

#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <ArduinoJson.h>
#include <Adafruit_NeoPixel.h>

#define LEDPIN D4
#define NUMBER_PIXELS 1

Adafruit_NeoPixel led = Adafruit_NeoPixel(NUMBER_PIXELS, LEDPIN, NEO_RGB + NEO_KHZ800);

// Wifi Credentials
const char* ssid = "WeWork";
const char* password = "p@ssw0rd";

const char* mqtt_server = "mqtt.beebotte.com";

// For Beebotte, the MQTT token must be your "secret token", not the channel token
const char* mqtt_token = "abc123";

// For Beebotte, this should be "channel/resource"
const char* mqtt_resource="ESP8266/led";

WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;

void setup_wifi() {
  delay(10);
  
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  randomSeed(micros());
  digitalWrite(LED_BUILTIN, HIGH);
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void onMessage(char* topic, byte* payload, unsigned int length) {
  // decode the JSON payload
  StaticJsonBuffer<128> jsonInBuffer;
  JsonObject& root = jsonInBuffer.parseObject(payload);

  // Test if parsing succeeds.
  if (!root.success()) {
    Serial.println("parseObject() failed");
    return;
  }

  uint8_t red = root["red"];
  uint8_t green = root["green"];
  uint8_t blue = root["blue"];

  // Print the received value to serial monitor for debugging
  Serial.println();
  Serial.println("------------------------------------");
  Serial.print("Received new message of length "); 
  Serial.print(length);
  Serial.println();
  Serial.println("Raw message: ");
  root.prettyPrintTo(Serial);
  Serial.println();
  Serial.print("Red: ");
  Serial.print(red);
  Serial.print(" Green: ");
  Serial.print(green);
  Serial.print(" Blue: ");
  Serial.println(blue);
  Serial.println("------------------------------------");
  Serial.println();
  
  led.setPixelColor(NUMBER_PIXELS-1, red, green, blue);
  led.show();
}


void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP8266Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str(),mqtt_token,"")) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      client.publish(mqtt_resource, "hello world");
      // ... and resubscribe
      client.subscribe(mqtt_resource);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);

  // Turn off builtin led
  digitalWrite(LED_BUILTIN, LOW);

  // Initialize Neopixel
  led.begin();
  led.setPixelColor(NUMBER_PIXELS-1, 0, 0, 0);
  led.show();
  
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(onMessage);
}

void loop() {

  if (!client.connected()) {
    reconnect();
  }
  client.loop();

//  long now = millis();
//  if (now - lastMsg > 2000) {
//    lastMsg = now;
//    ++value;
//    snprintf (msg, 75, "hello world #%ld", value);
//    Serial.print("Publish message: ");
//    Serial.println(msg);
//    client.publish("ESP8266/led", msg);
//  }
}