Implement unstoppable background service in react native

I am trying to run a unstoppable background service in react native which will continuously listen for messages via Socket.io from server.

For this I found several solutions with several problems

1. Use FCM

   The problem with method is that first I have to listen for FCM event than connect to my server and get the data(Messages + images + Videos). And I don't want to use firebase for my app as its expensive and don't want to store my user data (Mainly images) and handle user auth.

2. Use react-native-background-fetch

   This thing is pretty good but it only allow to run single job every 5 minutes and if your service is killed by android than you are gone

3. Use Headless JS

   To be honest I cannot understand its documentation

Please tell me what to s I am confused and amazed that there is no proper way to handle this TIA regards