acidburns 237e392c02 Make IEC 62056-21 meter input non-blocking ...

- Add RX state machine with frame buffer, timeouts, and debug counters

- Expose meter_poll_frame/meter_parse_frame and reuse existing OBIS parsing

- Use cached last-valid frame at 1 Hz sampling to avoid blocking

- Document non-blocking meter handling in README

2026-02-02 22:03:58 +01:00

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