MeshCore firmware sets its clock only forward: CMD_SET_DEVICE_TIME with an earlier time is answered ERR_CODE_ILLEGAL_ARG, which read as 'the device rejected the request as malformed'. Since 2026-09-24 the companion's clock has been ahead of this computer's (itself within 0.7 s of NTP), so every connect's sync was refused. set_clock now reads the radio's clock first: within a minute ahead is in sync and nothing is written; further ahead raises ClockAheadError, which says by how much and that a reboot resets it. The device layer also maps the firmware's refusal to that error, and the simulator's clock now only moves forward, like the firmware's.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Jean-Pierre MartineauandClaude Opus 5.5
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