Different types of units. Writing values, relay unit

esp_server/Program.cs

@@ -62,6 +62,8 @@ namespace ESPServer
 			unitReceiver.Start();
 			var unitPinger = new UnitPinger(db);
 			unitPinger.Start();
+			// initialize data writer (do not need to save it as it will react on events by itself)
+			new UnitDataWriter(db, registers);
 			var modbusServer = new ModbusServer(registers);
 			modbusServer.Port = config.RootElement.GetProperty("modbusPort").GetInt32();
 			modbusServer.Run();