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maziggy
b663605318
OrcaSlicer connects, exchanges pushall + get_version, then sits idle waiting
for status pushes from the (virtual) printer. The VP MQTT server's read
loop used `asyncio.wait_for(reader.read(1), timeout=60)` regardless of what
the client negotiated, and `_handle_connect` explicitly skipped the
keepalive field in the CONNECT payload, so every idle slicer connection was
torn down at exactly 60s.
- Parse the 2-byte big-endian keepalive from CONNECT; return it from
_handle_connect alongside the auth bool.
- Use 1.5x the negotiated keepalive as the per-packet read timeout per
MQTT spec sec 4.4. Treat keep_alive == 0 as no timeout (spec sec 3.1.2.10).
- Retain the 60s default for the initial read before CONNECT arrives, so
a TCP-connect-without-CONNECT still gets reaped.
- 7 new tests: 4 unit-level for the parser (success, opt-out=0, auth-fail
tuple shape, malformed CONNECT) + 3 integration-style for the read loop
(long keepalive survives the old 60s mark, short keepalive closes idle
in ~3s, PINGREQ resets the window so DISCONNECT decides the exit).