zhangyisong 1e6d6b9b30 Add support for heating state and NTC commands
Extend the UART protocol to support writing and reading the heating
state, and reading individual pole NTC sensors and the heating pad NTC.
Cache NTC readings for query on demand.  Move PID updates to a workqueue
to avoid blocking the timer IRQ context.
2026-07-13 21:57:54 +08:00
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