Hirek193 314595e8f0 hardware protocol v2: make the hello handshake idempotent ...

A device which doesn't hear the welcome repeats its greeting. Minting a
fresh session for every repeat left both ends chasing each other's
session ids: the device eventually answered with the id it had been
given, the simulator had already moved on and rejected it as
INVALID_SESSION, the device restarted the handshake, and so on twice a
second for as long as the link was up.

The same greeting arriving on a session which has not been used yet is
now answered with the session it already has, and only a different
device, or one whose session had progressed, gets a new id. Repeated
greetings are counted as handshakes and shown in the debug panel, so the
condition which causes them stays visible instead of flooding the log.

2026-09-17 15:01:58 +00:00

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