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fix(protocol): correct A5 frame classification and chunk counter formula

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This commit is contained in:
Brian Harrison
2026-04-24 17:25:29 -04:00
parent 43c8158493
commit 35c3f4f945
4 changed files with 48 additions and 27 deletions
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minimateplus/protocol.py
+6 -4
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@@ -126,10 +126,12 @@ DATA_LENGTHS: dict[int, int] = {
_BULK_CHUNK_OFFSET = 0x1004 # offset field for probe + all regular chunk requests ✅
_BULK_TERM_OFFSET = 0x005A # offset field for termination request ✅
_BULK_COUNTER_STEP = 0x0400 # chunk counter increment per chunk ✅
# Chunk counter formula: chunk_num * 0x0400 for ALL chunks including chunk 1.
# Earlier captures showed 0x1004 for chunk 1 — that was a Blastware artifact, not a
# protocol requirement. Confirmed 2026-04-06: 0x0400 for chunk 1 works; 0x1004
# causes a 120-second device timeout. Formula n * 0x0400 is used for all chunks.
# Chunk counter formula: key4[2:4] + (chunk_num - 1) * 0x0400
# where key4[2:4] is the event's circular-buffer base offset ((key4[2]<<8)|key4[3]).
# Earlier captures showed 0x1004 for chunk 1 of key 01110000 — that was a Blastware
# artifact. For keys where key4[2:4] != 0x0000 (e.g. key 01111884) the old
# "n * 0x0400" formula sends counters from the wrong buffer region and the device
# returns data from a different event. Confirmed correct 2026-04-24.
# Default timeout values (seconds).
# MiniMate Plus is a slow device — keep these generous.