Add update timezone command support

Author: robgee86

src/ArduinoIoTCloudTCP.cpp

@@ -421,6 +421,13 @@ void ArduinoIoTCloudTCP::handleMessage(int length)
         }
         break;
 
+        case CommandId::TimezoneCommandDownId:
+        {
+          DEBUG_VERBOSE("ArduinoIoTCloudTCP::%s [%d] timezone update received", __FUNCTION__, millis());
+          _thing.handleMessage((Message*)&command);
+        }
+        break;
+
         case CommandId::LastValuesUpdateCmdId:
         {
           DEBUG_VERBOSE("ArduinoIoTCloudTCP::%s [%d] last values received", __FUNCTION__, millis());

src/ArduinoIoTCloudThing.cpp

@@ -76,6 +76,14 @@ void ArduinoCloudThing::update() {
         nextState = State::Connected;
       }
       break;
+    
+    /* We have received a timezone update */
+    case TimezoneCommandDownId:
+    {
+      TimezoneCommandDown * cmd = (TimezoneCommandDown *)_command;
+      TimeService.setTimeZoneData(cmd->params.offset, cmd->params.until);
+    }
+    break;
 
     /* We have received a reset command */
     case ResetCmdId: