C# xamarin android I want to create a service that runs in the background that never ends and works when it starts up

C# xamarin android I want to create a service that runs in the background that never ends and works when it starts up Working on sending http post Upload data to a server It works every 30 seconds It works even if the application does not open It works with the phone turned on The service does not stop even if the phone sleeps phone with Root Android versions 5+