arduino mqtt led stripe

mqtt-led

#include <PubSubClient.h>
#include <SPI.h>
#include <Ethernet.h>
 
// don't futz with these, illicit sums later
#define RED      7// pin for red LED
#define GREEN    8 // pin for green - never explicitly referenced
#define BLUE     2 // pin for blue - never explicitly referenced

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
byte server[] = { 192, 168, 88, 158 };

EthernetClient ethClient;
PubSubClient client(server, 1883, callback, ethClient);

byte brightness[3] = {200, 255, 245};

void setColor(byte r, byte g, byte b) {
  analogWrite(RED, r * brightness[0] / 255);
  analogWrite(GREEN, g * brightness[1] / 255);
  analogWrite(BLUE, b * brightness[2] / 255);
  
  Serial.print("Processed RGB: ");
  Serial.print(r * brightness[0] / 255);
  Serial.print(g * brightness[1] / 255);
  Serial.println(b * brightness[2] / 255);
}

void setup() {
  pinMode(RED, OUTPUT);
  pinMode(GREEN, OUTPUT);
  pinMode(BLUE, OUTPUT);
  
  setColor(100,100,100);
  
  Serial.begin ( 9600 );
  Serial.println("connecting...to ethernet");  
  // Start the Ethernet connection
  Ethernet.begin(mac);

  Serial.println("connecting to openHab");  
  if (client.connect("arduinoClient")) {
    Serial.println("ok");  
    client.subscribe("\/room\/ambilight\/color");
  } else {
    Serial.println("fail");
    while(1) {};  
  }
}


void callback(char* topic, byte* payload, unsigned int length) {
  // check for messages on subscribed topics
  Serial.print("Topic: ");
  Serial.println(String(topic));

  // check topic to identify type of content
  if(String(topic) == "\/room\/ambilight\/color") {
    // convert payload to String
    String value = String((char*)payload).substring(0, length);
    Serial.println(value);
    Serial.println(length);

    // split string at every "," and store in proper variable
    // convert final result to integer
    byte TopperR = value.substring(0,value.indexOf(',')).toInt();
    byte TopperG = value.substring(value.indexOf(',')+1,value.lastIndexOf(',')).toInt();
    byte TopperB = value.substring(value.lastIndexOf(',')+1).toInt();

    Serial.print("Unprocessed RGB: ");
    Serial.print(TopperR);
    Serial.print(TopperG);
    Serial.println(TopperB);
    setColor(TopperR, TopperG, TopperB);
  }
  
  payload = 0;
}

void loop() {
  client.loop();
}