Files
capod/app
darken edf84248ab fix(anc): Don't show a phantom Off mode when AirPods misreport the listening mode
AirPods Pro 3 can answer a listening mode write with 0x0D 0x01 (Off) while
audibly switching to the requested mode. Seen on firmware
81.2675000075000000.6503, intermittently, and not reproducible on demand.

CAPod took that report at face value: it surfaced an Off button that isn't even
in the device's listening mode cycle, selected it, and said nothing about the
request not having been confirmed.

- visibleAncModes no longer re-admits a mode purely because it is the current
  one. That escape clause was what conjured the extra button.
- effectiveAncMode keeps showing the requested mode while our own request is
  outstanding and the device reports a mode it should not be able to reach.
- A rejected listening mode request now surfaces a message for every mode, not
  only Off. Other modes were dropped silently.
- The Allow Off inference ignores an Off report that arrived while a different
  mode was pending, so a single glitch cannot permanently persist "Off is
  allowed" into the device profile. An unsolicited Off still trains it, which
  is what keeps the option discoverable after it is enabled elsewhere.
- Verification deadline moved from a hardcoded 1000ms to 2000ms, and a matching
  device report now settles the verification when it arrives. Measured reply
  latency is 833-1008ms, so the old deadline sat inside the device's normal
  spread and could fire a bogus divergence plus a redundant re-send.

Settling verification on arrival is limited to SetAncMode deliberately. Every
other verified command is optimistically written into state when it is queued,
so its predicate is satisfied immediately and only the device's contradicting
echo makes it fail. Settling those early would swallow the rejection.

Note that AirPods never report AllowOffOption (0x34) or ListeningModeCycle
(0x1A), so which modes are permitted is always inferred, never device truth.
2026-08-19 19:09:20 +02:00
..
2022-09-14 18:00:18 +02:00
2022-09-14 18:00:18 +02:00