4ab133c266
- /api/send-ota no longer 500s on a counter-less body: the plain `sp` path
reports final_cntr only when the counter is usable (_counter_valid, 1-10 hex
digits) - before, the new plain-path report ran int('') and the request died
in the generic handler. The failure path is guarded the same way.
- _decode_por wraps the keyset/SPI construction in the same "never raise" rule
as the decode: a malformed counter or missing keys return None instead of
escaping the handler.
- presets.add() never accepts a taken id (a fresh uuid is assigned, like the
import path), the counter is validated as 1-10 hex digits instead of being
silently masked/kept, and set_counter() ignores a malformed value with a log
line instead of writing it.
- the preset endpoints answer a JSON 500 when the store write fails (read-only
home, disk full) instead of dropping the connection.
- tests: counter-less send-ota, store-write 500, duplicate id, counter
validation (add/update/set_counter), and the temp-file check no longer
matches the audit file; docs/api.md documents final_cntr for the plain path
and preset_id.