deskcontrol/src/main.cpp

#include <Homie.h>
#include <Syslog.h>
#include <WiFiUdp.h>
WiFiUDP udpClient;
Syslog syslog(udpClient, SYSLOG_PROTO_IETF);

const int PIN_RELAY = D1;
int timer = 0;
HomieNode powerNode("power", "switch");

bool powerStateHandler(const HomieRange& range, const String& value) {
    if (value != "true" && value != "false") return false;
    bool on = (value == "true");
    digitalWrite(PIN_RELAY, on ? LOW : HIGH);
    powerNode.setProperty("state").send(value);
    Homie.getLogger() << "Power is " << (on ? "on" : "off") << endl;

    return true;
}

bool powerTimerHandler(const HomieRange& range, const String& value) {
    int settimer = value.toInt();
    if(settimer == 0 || settimer > 120) 
         return false;

    powerNode.setProperty("timer").send(String(settimer));
    powerNode.setProperty("state").send("on");
    Homie.getLogger() << "Power is on for " << settimer << "minutes" << endl;
    digitalWrite(PIN_RELAY, on ? LOW : HIGH);
    return true;
}


void setupHandler() {
    pinMode(PIN_RELAY, OUTPUT);
    digitalWrite(PIN_RELAY, HIGH);

    powerNode.setProperty("state").send("off");
}

void onHomieEvent(const HomieEvent& event) {
  switch(event.type) {
    case HomieEventType::OTA_FAILED:
      syslog.log(LOG_INFO, "OTA failed");
      // Do whatever you want when OTA is failed
      break;
    case HomieEventType::OTA_SUCCESSFUL:
      syslog.log(LOG_INFO, "OTA completed");
      break;
    case HomieEventType::ABOUT_TO_RESET:
      // Do whatever you want when the device is about to reset
      break;
    case HomieEventType::WIFI_CONNECTED:
      // Do whatever you want when Wi-Fi is connected in normal mode
      syslog.deviceHostname(Homie.getConfiguration().name);
      syslog.appName("deskcontrol");
      syslog.defaultPriority(LOG_ERR);
      syslog.log(LOG_INFO, "WiFi Connected, software version: 1.0");
      break;
    case HomieEventType::MQTT_READY:
      syslog.log(LOG_INFO, "MQTT connected");
      break;
    case HomieEventType::MQTT_DISCONNECTED:
      syslog.log(LOG_INFO, "MQTT disconnected");
      break;
    default:
      break;
  }
}

void setup() {
    syslog.server("192.168.1.100", 514);

    Serial.begin(115200);

    Serial << endl << endl;
    Serial << "Firmware 0.0.1" << endl;
    Serial << endl << endl;

    Homie_setFirmware("deskcontrol", "1.0.0");
    Homie_setBrand("FuryFire");

    powerNode.advertise("state").settable(powerStateHandler);
    powerNode.advertise("timer").settable(powerTimerHandler);
    Homie.setSetupFunction(setupHandler);
    Homie.onEvent(onHomieEvent); // before Homie.setup()
    Homie.setup();
}

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