fix rmb calls timeout

[Nabil-Salah]

Description

added exponential backoff and app exit when the listener thread is down

Changes

src/bins/rmb-relay.rs file

Related Issues

issue#200

Checklist

• Tests included
• Build pass
• Documentation
• Code format and docstring

[Nabil-Salah]

How we tested our approch:

first we ran an rmb-relay locally on my device on a successful runs connecting to the chain

we started another rmb-peer connected to the local relay

the redis database shows a successful change

after that I managed to cut the relay connections to the chain

in another remote device I ran rmb-peer with different twin id and changed the relay to a local relay

then I released block on the connection in the previous step

and it catches the peer change in the relay

[sameh-farouk]

The changes introduce valuable improvements overall. However, the loop remains infinite without external exit control or mechanisms such as a termination or shutdown signal. Upon reviewing the code base, it appears that the RMB relay lacks a fully implemented graceful shutdown mechanism:

1. The main relay server loop in src/relay/mod.rs runs in an infinite loop without handling shutdown.
2. The federation worker also operates in an infinite loop without shutdown handling.
3. The event listener in this PR similarly lacks shutdown handling.

I recommend implementing proper graceful shutdown handling to ensure reliable operation. However, it would be more reasonable to address this in a separate PR.

[Omarabdul3ziz]

good job ya nabil, i have small comments

[Omarabdul3ziz]

i tired and it do retry with backoff, but can we extend the timeout? maybe 5 min