sl-uwb 82cc223fb8 feat: Add AT+PEER_RANGE= command for inter-anchor calibration (Issue #602)
- peer_range_once(): DS-TWR initiator role toward a peer anchor
  (POLL → RESP → FINAL, one-sided range estimate Ra - Da/2)
- AT+PEER_RANGE=<id>: returns +PEER_RANGE:<my>,<peer>,<mm>,<rssi>
  or +PEER_RANGE:ERR,<peer>,TIMEOUT

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-03-14 15:06:29 -04:00
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