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fix(protocol): enhance extra chunk fetching logic to ensure footer detection

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This commit is contained in:
Brian Harrison
2026-04-23 18:22:27 -04:00
parent bc9f16e503
commit ecd980d345
2 changed files with 23 additions and 10 deletions
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minimateplus/protocol.py
+17 -4
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@@ -652,8 +652,14 @@ class MiniMateProtocol:
# and primes the device to return a valid footer in the termination
# response. Without it, termination returns an empty ack with no
# footer bytes (confirmed 2026-04-23 from HxD comparison).
log.debug("5A A5[%d] metadata found — fetching %d more chunk(s) then stopping",
chunk_num, extra_chunks_after_metadata)
# Download extra chunks until we find the footer chunk (contains
# 0x0e 0x08 near its end) or hit the extra_chunks_after_metadata
# cap. The footer bytes are embedded in the last meaningful data
# chunk, NOT in the termination response. For short events (1-sec)
# the footer is in extra chunk 1. For longer events it is in a
# later chunk. Confirmed 2026-04-23 from BW file comparison.
log.debug("5A A5[%d] metadata found — fetching extra chunks until footer found",
chunk_num)
for _extra_n in range(extra_chunks_after_metadata):
chunk_num += 1
counter = chunk_num * _BULK_COUNTER_STEP
@@ -661,13 +667,20 @@ class MiniMateProtocol:
self._send(build_5a_frame(_BULK_CHUNK_OFFSET, params))
try:
extra = self._recv_one(expected_sub=rsp_sub, timeout=10.0)
log.debug("5A A5[%d] extra chunk page_key=0x%04X data_len=%d",
chunk_num, extra.page_key, len(extra.data))
log.debug("5A A5[%d] extra chunk page_key=0x%04X data_len=%d has_footer=%s",
chunk_num, extra.page_key, len(extra.data),
b'\x0e\x08' in extra.data[-50:])
if extra.page_key == 0x0000:
if include_terminator:
frames_data.append(extra)
return frames_data
frames_data.append(extra)
# Stop as soon as we find the footer marker in the tail
# of this chunk — the body is complete.
if b'\x0e\x08' in extra.data[-50:]:
log.debug("5A A5[%d] footer marker found — stopping extra chunks",
chunk_num)
break
except TimeoutError:
log.debug("5A extra chunk %d timed out — end of stream", _extra_n + 1)
break