pub const PROTOCOL_VERSION: u16 = 0x2A;Expand description
Highest MX Remote protocol version understood.
This is what a hello announces about this client, and it is not what any
frame is stamped with - stamp_for decides that per opcode. A peer holds
it as this client’s ceiling, so understating it costs whatever the peer
then withholds.
A peer also sets this client’s offline window from it: 15s from 0x20, and 60s from 0x2A when the peer is itself on 0x2A.