[AppDaemon] How to call a service (Example)

Yes I got my answer. Thanks a lot for helping me.

Here is my implementation of the solution:

    # ----------------------------------------------------------------------------------
    def initialize(self):

        # create staubsauger object
        self.staubsauger = self.get_entity("vacuum.deebot_t8_aivi")

    # ----------------------------------------------------------------------------------
    def device_move_to_coordinates(self, s_pos):
        self.staubsauger.call_service(
            service="send_command",
            command="clean_V2",
            params={
                "act": "start",
                "content": {
                    "type": "customArea",
                    "total": 0,
                    "donotClean": 1,
                    "count": 1, 
                    "value": f"{s_pos},{s_pos}",    # needs two points that are overlapping: x,y,x,y
                },
            },
        ) 
		
    # ----------------------------------------------------------------------------------
    def device_clean_rooms(self, s_room_numbers):
        self.staubsauger.call_service(
            service="send_command",
            command="spot_area",
            params={"rooms": f"{s_room_numbers}", "cleanings": 1},
        ) 

    # ----------------------------------------------------------------------------------
    def device_clean_area(self, s_area_coordinates):
        self.staubsauger.call_service(
            service="send_command",
            command="custom_area",
            params={"coordinates": f"{s_area_coordinates}"},
        )