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;
+}

things/DeviceRelay.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "Device.h"
+#include <Homie.h>
+
+class DeviceRelay : public Device {
+  public:
+    inline DeviceRelay(byte relayPin, char* relayName):relayNode(relayName, "relay") {
+      pinRelay = relayPin;
+      nameRelay = relayName;
+    }
+    virtual void deviceSetup();
+    virtual void deviceRegister();
+    virtual void deviceLoop();
+    bool relayOnHandler(String value);
+  private:
+    byte pinRelay;
+    char* nameRelay;
+    void setRelay(bool value);
+    HomieNode relayNode;
+};

things/HardwareSonoff.h

@@ -9,14 +9,22 @@
  */
 
 #include "DeviceButton.h"
+#include "DeviceRelay.h"
 
 const char* FWNAME = "things@Sonoff";
 
 const byte PIN_BUTTON = 0;
 DeviceButton deviceButton(PIN_BUTTON);
 
+const byte PIN_RELAY = 12;
+DeviceRelay deviceRelay(PIN_RELAY, "relay");
+
 Device* devices[] = {
   &deviceButton,
+  &deviceRelay,
 };
 
-void hardwareSetup() {};
+void hardwareSetup() {
+  pinMode(PIN_RELAY, OUTPUT);
+  digitalWrite(PIN_RELAY, HIGH);
+};