bsncubed/aes67-ESP32-P4
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Step 6.2: role hand-over, session_ver bump on GM change

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- aes67_cfg: cfg_set_number(group, key, value, apply) for firmware-side
  changes, stored in NVS like a POST; apply can be skipped.
- aes67_sdp_sap: once a second, a change of the PTP GM (ts-refclk) bumps
  aes67.session_ver without re-applying the aes67 group (no stream
  restart); SAP then re-announces. Runs whether or not SAP is on.
- Verified with ptp4l as a normal clock (p1 128): board auto (p1 250)
  steps down to SLAVE (session_ver 1->2); role master p1 100 via API ->
  board MASTER at once (->3); back to auto p1 250 -> ptp4l takes over
  within ~1 s, board SLAVE again (->4).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Ben Nicholson
2026-09-25 08:08:00 +10:00
parent 08b83a069c
commit dcea39b216
4 changed files with 56 additions and 1 deletions
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docs/aes67-core-base.md
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@@ -89,7 +89,7 @@ When this device is the GM, offset/frequency/delay show "–".
- SDP: v, o (aes67 IP, session_id, session_ver), s, c=mcast/ttl, t=0 0, a=clock-domain:PTPv2 <dom>, m=audio port RTP/AVP pt, a=rtpmap, a=recvonly, a=ptime, a=ts-refclk:ptp=IEEE1588-2008:<gm>:<dom>, a=mediaclk:direct.
- SAP to 239.255.255.255:9875 every 30 s, plus immediately on change; deletion packet on disable or shutdown.
- Implemented (aes67_sdp_sap): SAPv1, payload type `application/sdp`, msg id hash = 16-bit hash of the SDP, TTL = aes67.ttl. The SDP is checked once a second; on a change the old hash is deleted before the new one is announced. Nothing is announced until a PTP GM is known (else ts-refclk would be all zeros). Shutdown deletion via `esp_register_shutdown_handler` (covers reboot and OTA).
- Not done yet: bumping session_ver on a GM change (needs a firmware-side config write; relevant once the device can become GM, step 6). A GM change already re-announces immediately with the new ts-refclk.
- GM change: aes67.session_ver is bumped (stored via `cfg_set_number`, without re-applying the aes67 group so the stream keeps running) and SAP re-announces within 1 s. The first GM after boot is not counted as a change.
- Media 2 (ST 2022-7 redundancy): not possible on single-port boards like the ESP32-P4-ETH. Keep the schema open for a `mcast2`/`port2` pair on dual-NIC hardware (Riedel applies one PTP config to both Media 1 and Media 2).
## AES67 RX (future, for receiver projects) — Riedel Director 4-wire input defaults