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fix(client): correct recording_mode anchor position in compliance config encoding

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This commit is contained in:
Brian Harrison
2026-04-21 01:17:45 -04:00
parent 9b5cdfd857
commit b3dcfe7239
2 changed files with 18 additions and 8 deletions
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minimateplus/client.py
+17 -7
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@@ -1770,10 +1770,13 @@ def _encode_compliance_config(
DLE-jitter shifts):
Anchor: b'\\xbe\\x80\\x00\\x00\\x00\\x00' (confirmed stable, both BE11529 and BE18189)
recording_mode → uint8 at anchor_pos - 7 (write payload)
recording_mode → uint8 at anchor_pos - 8 (BOTH read and write)
Values: 0x00=Single Shot, 0x01=Continuous, 0x03=Histogram, 0x04=Histogram+Continuous
NOTE: In the E5 read response (decode) field is at anchor_pos - 8 due to an
extra 0x10 byte at read anchor_pos - 7. Write payload has no extra byte.
NOTE: The byte at anchor_pos - 7 is always 0x10 (a DLE marker regenerated by
device firmware in every E5 response). It must NOT be overwritten during
write — doing so causes anchor drift (+1 per write cycle).
CORRECTION 2026-04-21: previous doc stated anchor-7 for write; empirically
confirmed wrong — writing to anchor-7 shifts the anchor by 1 on every cycle.
sample_rate → uint16 BE at anchor_pos - 6
histogram_interval_sec → uint16 BE at anchor_pos - 4 (seconds; mode-gated to Histogram/Histogram+Continuous)
Valid values: 2, 5, 15, 60, 300, 900 (= 2s, 5s, 15s, 1m, 5m, 15m)
@@ -1844,9 +1847,10 @@ def _encode_compliance_config(
else:
log.info(
"_encode_compliance_config: anchor at cfg[%d] buf_len=%d "
"(expected ~15; fields: recording_mode@%d sample_rate@%d:%d "
"(recording_mode@%d DLE_marker@%d sample_rate@%d:%d "
"histogram_interval@%d:%d record_time@%d:%d)",
_anc, len(buf),
_anc - 8,
_anc - 7,
_anc - 6, _anc - 4,
_anc - 4, _anc - 2,
@@ -1854,12 +1858,18 @@ def _encode_compliance_config(
)
if recording_mode is not None:
if _anc < 7:
if _anc < 8:
log.warning("_encode_compliance_config: anchor not found — cannot write recording_mode")
else:
buf[_anc - 7] = recording_mode & 0xFF
# Write to anchor-8, same physical position as the E5 read format.
# The byte at anchor-7 is a DLE marker (0x10) that the device firmware
# regenerates in every E5 response — it must NOT be overwritten.
# Writing to anchor-7 causes the device to add an extra byte on the
# next read-back, drifting the anchor by +1 on every write cycle.
# (CLAUDE.md "anchor-7 write" was incorrect — confirmed 2026-04-21)
buf[_anc - 8] = recording_mode & 0xFF
log.debug("_encode_compliance_config: recording_mode=0x%02X -> offset %d",
recording_mode, _anc - 7)
recording_mode, _anc - 8)
if sample_rate is not None:
if _anc < 6: