v2.10.0

What's Changed

CC2 Client Hardening

Four improvements to the Elegoo Centauri 2 MQTT client, based on comparison with the OctoEverywhere implementation:

• Light control dual-param — set_light_status() now sends both brightness and power fields for firmware compatibility (some firmware expect one, some the other)
• Auth failure detection — Detects MQTT CONNACK rc=4/5 (bad credentials) and skips fallback passwords instead of wasting time retrying
• Connection generation guard — Per-listener generation token prevents stale MQTT callbacks during reconnect, fixing a race where a new listener could overwrite the guard for an older one
• Delayed disconnect — 5-second delay on queue cleanup preserves transient state (e.g. COMPLETE→IDLE transitions) across brief network drops

Bug Fixes

• CC2 discovery timeout — Bounded CC2 discovery in the config flow so non-CC2 printers don't time out during setup
• Stale thumbnail on reprint — Fixed thumbnail not updating when reprinting the same filename with new colors

Testing

• 15 new unit tests across 4 test files
• Full test suite: 284 tests passing
• Lint and format checks clean

Pull Requests

• #385: CC2 client improvements: light control, auth detection, connection guard, delayed disconnect
• #384: Bound CC2 discovery in the config flow so non-CC2 printers don't time it out
• #375: Fix stale thumbnail when reprinting same filename with new colors

Thanks

Huge thanks to everyone who contributed to this release:

• @montoyenn-spec — CC2 discovery timeout fix (#384)
• @lantern-eight — Stale thumbnail fix (#375)

Previous Releases

See v2.9.0 for earlier changes.