api/firmware: reset sessions on connect - #187
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Disconnecting after an intermediate signing response leaves the firmware waiting for a continuation while the device stays powered. On reconnect, the old workflow consumes the first attestation request and returns an encrypted error, causing the attestation check to fail. Send HWW_REQ_RESET (0x03) after version discovery and before attestation, unlock, and Noise pairing on firmware v9.28.0 or newer. Keep the helper private, retry BUSY responses once per second, and require an ACK without a payload. Older firmware keeps its existing connection flow. Add a simulator regression that disconnects with signing unfinished, reconnects to the same running process, checks the real attestation response, pairs, and reads the root fingerprint. Older simulator versions exercise ordinary reconnects. The regression uses the locally built v9.28.0 C simulator and fails if the reset call is disabled. Firmware counterpart: BitBoxSwiss/bitbox02-firmware#2111
This was referenced Sep 17, 2026
benma
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bznein and
cedwies
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cedwies
September 17, 2026 14:30
benma
marked this pull request as ready for review
September 17, 2026 14:30
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Disconnecting after an intermediate signing response leaves the firmware
waiting for a continuation while the device stays powered. On reconnect,
the old workflow consumes the first attestation request and returns an
encrypted error, causing the attestation check to fail.
Send HWW_REQ_RESET (0x03) after version discovery and before attestation,
unlock, and Noise pairing on firmware v9.28.0 or newer. Keep the helper
private, retry BUSY responses once per second, and require an ACK without
a payload. Older firmware keeps its existing connection flow.
Add a simulator regression that disconnects with signing unfinished,
reconnects to the same running process, checks the real attestation
response, pairs, and reads the root fingerprint. Older simulator versions
exercise ordinary reconnects. The regression uses the locally built
v9.28.0 C simulator and fails if the reset call is disabled.
Firmware counterpart: BitBoxSwiss/bitbox02-firmware#2111
Related client PRs in this change: