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fix: restore verified XIAO RS485 pin direction

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nick
2026-07-26 18:38:14 -06:00
parent 753d13157e
commit ab5424d82e
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docs/SENSOR_NODE_PROTOCOL.md
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The XIAO sensor node reads the BNO086 and MAX-M10S and publishes vehicle telemetry over half-duplex RS485 at 115200 8-N-1, one JSON object per line at 4 Hz. It owns no control state. Cargo remains the controller, HTTP server, and `/api/v1` source of truth; JBD/NimBLE behavior is unchanged.
The expansion-board pins are D2 driver enable, D4 RX, and D5 TX, matching Seeed's XIAO RS485 expansion-board wiring. Only physical bus ends should be terminated. Confirm A/B polarity because vendor labels vary.
The expansion-board pins are D2 driver enable, D4 TX, and D5 RX. This matches Seeed's working example call `begin(115200, SERIAL_8N1, 7, 6)`: on XIAO, GPIO7 is D5/RX and GPIO6 is D4/TX. Only physical bus ends should be terminated. Confirm A/B polarity because vendor labels vary.
## Schema version 1