Prototype of timer implementation

src/main.cpp

@@ -6,18 +6,23 @@ Syslog syslog(udpClient, SYSLOG_PROTO_IETF);
 
 const int PIN_RELAY = D1;
 #define OUTPUT_SET(x)  digitalWrite(PIN_RELAY, x ? LOW : HIGH);
-int timer = 0;
+unsigned int timer = 0;
+unsigned int next_timer_update = 0;
 HomieNode powerNode("power", "switch");
 
 bool powerStateHandler(const HomieRange& range, const String& value) {
-    if (value != "true" && value != "false") return false;
+    if (value != "on" && value != "off") return false;
-    bool on = (value == "true");
-    OUTPUT_SET(on);
     powerNode.setProperty("state").send(value);
-    if(!on)
+    powerNode.setProperty("timer").send("0");
-	powerNode.setProperty("timer").send("0");
+    timer = 0;
-    Homie.getLogger() << "Power is " << (on ? "on" : "off") << endl;
+    if(value == "on") {
-
+      OUTPUT_SET(true);
+      Homie.getLogger() << "Power is on" << endl;
+    } else {
+      OUTPUT_SET(false);
+      Homie.getLogger() << "Power is off" << endl;
+    }
+    
     return true;
 }
 
@@ -26,6 +31,8 @@ bool powerTimerHandler(const HomieRange& range, const String& value) {
     if(settimer == 0 || settimer > 120) 
          return false;
 
+    timer = millis() + (settimer * 1000 * 60);
+    next_timer_update = millis() + 60*1000;
     powerNode.setProperty("timer").send(String(settimer));
     powerNode.setProperty("state").send("on");
     Homie.getLogger() << "Power is on for " << settimer << "minutes" << endl;
@@ -41,6 +48,25 @@ void setupHandler() {
     powerNode.setProperty("timer").send("0");
 }
 
+void loopHandler() {
+  if(timer)
+  {
+    if(timer < millis()) 
+    {
+      timer = 0;
+      OUTPUT_SET(false);
+      powerNode.setProperty("timer").send("0");
+    }
+    if(millis() > next_timer_update) {
+      next_timer_update = millis() + 60*1000;
+      unsigned int time_remaining = timer - millis();
+      unsigned int min_left = time_remaining / (60*1000);
+      powerNode.setProperty("timer").send(String(min_left));
+
+    }
+  }
+}
+
 void onHomieEvent(const HomieEvent& event) {
   switch(event.type) {
     case HomieEventType::OTA_FAILED:
@@ -50,9 +76,6 @@ void onHomieEvent(const HomieEvent& event) {
     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);
@@ -87,6 +110,7 @@ void setup() {
     powerNode.advertise("timer").settable(powerTimerHandler);
     Homie.setSetupFunction(setupHandler);
     Homie.onEvent(onHomieEvent); // before Homie.setup()
+    Homie.setLoopFunction(loopHandler);
     Homie.setup();
 }