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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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sfm/server.py
+6 -6
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@@ -885,17 +885,17 @@ def device_event_blastware_file(
def _do():
with _build_client(port, baud, host, tcp_port, timeout=120.0) as client:
info = client.connect()
# Calculate extra ADC chunks to download after finding "Project:".
# BW downloads ~2 extra chunks per second of record time.
# Without enough extra chunks the termination response contains no
# footer bytes and Blastware rejects the file.
# Download extra chunks after "Project:" until the footer marker
# 0x0e 0x08 is detected in a chunk tail. The cap prevents
# accidentally downloading into post-event silence.
# Cap = rectime * 4 + 4 covers up to ~10 sec events safely.
rectime = 1.0
try:
rectime = float(info.compliance_config.record_time or 1.0)
except (AttributeError, TypeError, ValueError):
pass
extra_chunks = max(1, int(rectime))
log.info("blastware_file: rectime=%.1fs → extra_chunks=%d", rectime, extra_chunks)
extra_chunks = max(4, int(rectime * 4) + 4)
log.info("blastware_file: rectime=%.1fs → extra_chunks_cap=%d", rectime, extra_chunks)
events = client.get_events(
full_waveform=False,
stop_after_index=index,