Help with the custom_rplx_subprotocol example

[andy-thomason]

I would like to broadcast consensus messages to a group of peers using the P2P network using a custom protocol.

I've studied the custom_rlpx_subprotocol example but have a few questions:

Is a RLPx protocol appropriate for this use case? The example illustrates a point to point message call.

The example uses a local noop network instance, just add_rlpx_sub_protocol alone does not connect to existing or future peers via into_connection(), but does in the example when you call add_peer() on both handles.