The previous doc described only the proprietary 0x81 UART protocol, but
all current AirCarto firmwares (NebuleAir Pro 4G, ModuleAir light) talk
to the NextPM in Modbus RTU. Document the actual register mapping
(PM at 0x38/0x44 for 10s/60s averages, T/HR at 0x6B/0x6A, status at
0x13, 5 granulometric channels at 0x80-0x88), the LSW-MSW word order,
and both reading strategies (per-register and bulk read). Move the
proprietary 0x81 protocol to an annex; drop Python/C examples (to be
published in separate docs).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
