fix: change db7 to 5byte frame header from 8byte header

minimateplus/client.py

@@ -1356,9 +1356,12 @@ def _decode_a5_waveform(
         they are derived from the compliance config (the correct permanent source).
 
     A5[1..N] (chunk responses):
-        db[7:]  = [8-byte per-frame header] [waveform bytes ...]
-        Header:   [ctr LE uint16, 0x00 × 6] — frame sequence counter
-        Waveform starts at byte 8 of db[7:].
+        db[7:]  = [5-byte per-frame header] [waveform bytes ...]
+        Header:   [ctr LE uint16, 0x00 × 3] — frame sequence counter + 3 null bytes
+        Waveform starts at byte 5 of db[7:].
+        NOTE: Previously documented as 8-byte header — INCORRECT.  Confirmed 5 bytes
+        via "Standard Recording Setup" cross-frame continuity test on MITM capture
+        (4-11-26): A5[5] ends "St", A5[6].w[0:5] = 5 nulls, w[5:]= "andard…" ✓.
 
     ── Cross-frame alignment ────────────────────────────────────────────────────
     Frame waveform chunk sizes are NOT multiples of 8.  Naive concatenation
@@ -1491,10 +1494,14 @@ def _decode_a5_waveform(
         # (read_bulk_waveform_stream returns early on page_key==0).
         # No hardcoded frame-index skip here — all non-metadata frames are data.
         else:
-            # Strip the 8-byte per-frame header (ctr + 6 zero bytes)
-            if len(w) < 8:
+            # Strip the 5-byte per-frame header (ctr[2] + 3 zero bytes + 1 flag byte).
+            # Confirmed 2026-04-15 via "Standard Recording Setup" cross-frame continuity
+            # test on MITM capture (4-11-26): A5[5] ends with "St", A5[6].w[0:5] are
+            # 5 null bytes, w[5:] begins with "andard Recording Setup…" — contiguous iff
+            # header=5.  Previously documented as 8 bytes — INCORRECT.
+            if len(w) < 5:
                 continue
-            wave = w[8:]
+            wave = w[5:]
 
         if len(wave) < 2:
             continue