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harden USB telemetry transport

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Jay
2026-08-17 14:51:12 -04:00
parent 1cf0a9ac77
commit 3c95f3d7be
17 changed files with 709 additions and 114 deletions
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docs/binary-transport-validation-2026-08-17.md
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@@ -39,11 +39,11 @@ bytes even though stdio reports a successful write. Firmware therefore cannot
retain that particular frame or increment its drop counter. The receiver still
detects the loss through CRC resynchronization and packet/sample sequence gaps.
ESP-IDF's direct USB Serial/JTAG driver provides bounded writes and an explicit
transmit-drain wait, allowing a connected stall to become observable to the
transport policy. That is a useful improvement for the common transport layer.
It is not proof of receiver delivery; application acknowledgements and replay
are needed for that stronger guarantee and are planned with BLE integration.
This limitation was subsequently closed at the device/endpoint boundary by the
shared transport state machine and direct USB Serial/JTAG driver described in
`transport-layer-validation-2026-08-17.md`. It is not proof of receiver delivery;
application acknowledgements and replay are still needed for that stronger
guarantee and are planned with BLE integration.
## Final hardware capture