Particle Photon front lights

front_lights.ino

// This #include statement was automatically added by the Particle IDE.
// You'll have to search for and manually add the MQTT library in the Particle IDE.
#include <MQTT.h>

void callback(char* topic, byte* payload, unsigned int length);

/**
 * if want to use IP address,
 * byte server[] = { XXX,XXX,XXX,XXX };
 * MQTT client(server, 1883, callback);
 * want to use domain name,
 * exp) iot.eclipse.org is Eclipse Open MQTT Broker: https://iot.eclipse.org/getting-started
 * MQTT client("iot.eclipse.org", 1883, callback);
 **/
byte server[] = { 192, 168, 1, 78 };
MQTT client(server, 1883, callback);


int led2 = D7;   // led on pin7
int lights = D3; // outdoor lights

bool lights_on = false;

const char* on = "ON";
const char* off = "OFF";
const char* command_topic = "home/particle/lights/control";
const char* state_topic = "home/particle/lights/status";


void setup()
{
    pinMode(led2, OUTPUT);
    pinMode(lights, OUTPUT);

    // Couple of particle functions so that we can use the console to toggle the lights and reset this device.
    Particle.function("light", ledToggle);
    Particle.function("reset", resetDevice);

    // For good measure, let's also make sure both LEDs are off when we start:
    digitalWrite(led2, LOW);
    digitalWrite(lights, LOW);
   
    setupMQTT();
}

const char* discovery_payload = "{\"~\":\"home/particle/lights\",\"name\":\"Walkway\",\"unique_id\":\"walkway_light\",\"state_topic\":\"~/status\",\"command_topic\":\"~/control\",\"device\":{\"identifiers\":\"dustmite\",\"model\":\"Photon\",\"manufacturer\":\"Particle\"}}";
void setupMQTT() {
    Particle.publish("connecting-to-mqtt", PRIVATE);
    // connect to the server
    client.connect(System.deviceID());

    // publish/subscribe
    if (client.isConnected()) {
        // This uses Home Assistant's MQTT's device discovery
        // https://www.home-assistant.io/docs/mqtt/discovery/
        client.publish("homeassistant/light/dustmite/config", discovery_payload);
        client.subscribe(command_topic);
        client.publish(state_topic, off);
    }
}

void loop() {
    if (client.isConnected()) {
        client.loop();
    } else {
        Particle.publish("mqtt-connection-lost", PRIVATE);
        setupMQTT();
    }
}

// recieve message
void callback(char* topic, byte* payload, unsigned int length) {
    char p[length + 1];
    memcpy(p, payload, length);
    p[length] = NULL;
    
    if(!strcmp(topic, command_topic)) {
         if (!strcmp(p, on)) {
             turnOn();
         } else if (!strcmp(p, off)) {
             turnOff();
         }
    }
    delay(500);
}

int turnOn() {
    digitalWrite(lights, HIGH);
    digitalWrite(led2, HIGH);
    lights_on = true;
    client.publish(state_topic, on);
    return 1;
}

int turnOff() {
    digitalWrite(lights, LOW);
    digitalWrite(led2, LOW);
    lights_on = false;
    client.publish(state_topic, off);
    return 0;
}

// This is a particle function (good for testing)
int ledToggle(String command) {
    if (command == "on") {
        return turnOn();
    }
    else if (command == "off") {
        return turnOff();
    }
    else {
        return -1;
    }
}

int resetDevice(String command) {
    System.reset();
    return 0;
}