Socket.io sendBuffer information?

[cherimo]

I am currently using socket.io in my android app and there I can send messages to the server. Everything works as it should, also in offline mode the messages are stored in the sendBuffer.

My question is how robust is this sendBuffer because I find general information about how to disable the feature but little information about the properties of the sendBuffer. How long is the data stored in the sendBuffer? Will the data be erased when the app/mobile is restarted? If so I should have a backup database to store those messages.

Unfortunately I can't find these answers quickly on the internet and also via https://socket.io/docs/v3/client-offline-behavior/ there is little info.

Thank you in advance.