Added Modbus to OpenDTU

include/ModbusDtu.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <cstdint>
+#include "Configuration.h"
+#include <ModbusIP_ESP8266.h>
+#include <Hoymiles.h>
+
+class ModbusDtuClass {
+public:
+    void init();
+    void loop();
+
+private:
+    uint32_t _lastPublish;
+    uint8_t _channels;
+};
+
+extern ModbusDtuClass ModbusDtu;

include/WatchDogDtu.h

@@ -0,0 +1,16 @@
+#pragma once
+
+#include <cstdint>
+#include "Configuration.h"
+#include <esp_task_wdt.h>
+
+class WatchDogDtuClass {
+public:
+    void init();
+    void loop();
+
+private:
+    uint32_t _lastPublish;
+};
+
+extern WatchDogDtuClass WatchDogDtu;