first version with working relay function

things/DeviceRelay.cpp

@@ -0,0 +1,34 @@
+#include "DeviceRelay.h"
+
+void DeviceRelay::setRelay(bool value) {
+  digitalWrite(pinRelay, value);
+}
+
+void DeviceRelay::deviceSetup() {
+  pinMode(pinRelay, OUTPUT);
+  setRelay(HIGH);
+}
+
+bool DeviceRelay::relayOnHandler(String value) {
+  if (value == "true") {
+    setRelay(HIGH);
+    Homie.setNodeProperty(relayNode, "on", "true");
+    Serial.println("relay is on");
+  } else if (value == "false") {
+    setRelay(LOW);
+    Homie.setNodeProperty(relayNode, "on", "false");
+    Serial.println("relay is off");
+  } else {
+    return false;
+  }
+  return true;
+}
+
+void DeviceRelay::deviceRegister() {
+  relayNode.subscribe("on", [this](String value) { return relayOnHandler(value); });
+  Homie.registerNode(relayNode);
+}
+
+void DeviceRelay::deviceLoop() {
+  return;
+}