Mi Body Composition Scale 2: pin the real 7-byte history count reply

lib/ble/adapters/_registry.dart

@@ -979,8 +979,8 @@ bool _looksLikeThermometer(String lowercaseName) =>
 /// OS-level service filter does not match, so it is also named there
 /// ([BandEntry.scanServiceData]).
 ///
-/// EXPERIMENTAL (ASSUMPTIONS R6). Weight becomes a `weight` observation and
-/// impedance a vendor observation. With its developer flag on (default off)
+/// Verified on a physical Mi Body Composition Scale 2 (XMTZC05HM). Weight
+/// becomes a `weight` observation and impedance a vendor observation. With its developer flag on (default off)
 /// the newest weight within 10% of the profile's becomes it
 /// (`newestWeighing`); impedance
 /// stays a measurement only.

lib/ble/adapters/miscale.dart

@@ -23,7 +23,9 @@
 // impedance are shown attributed; with the scale's flag on, a weighing near
 // the profile's weight becomes it (`measurement_inputs.dart`).
 //
-// EXPERIMENTAL (ASSUMPTIONS R6): nobody on this project owns one.
+// The Mi Body Composition Scale 2 (XMTZC05HM) is verified on a physical unit:
+// pairing, stored history and live weight with impedance. The Mi Smart Scale 2
+// is still EXPERIMENTAL (ASSUMPTIONS R6): nobody on this project owns one.
 
 import 'dart:async';
 import 'dart:typed_data';

lib/compute/derivation_engine.dart

@@ -2077,7 +2077,10 @@ const String kAnalyticsPin = '3a7ca34d30233ff11e6c2877083f319a907ccb31';
 // main merge commit. Re-pointed at that branch's Huami gap fix (minutes()
 // empty after a counter gap); NO kAlgoVersion bump: the adapter already
 // decoded only gap-free transfers, so no output changes.
-const String kProtocolPin = '89080bcfac7767b3a871fd3a7d9307f5f30dad26';
+// REPIN: protocol main @ b4fde6a (#81 Mi scale 7-byte history count, on top
+// of #82 decoder hardening). NO kAlgoVersion bump: decode runs at ingest, so a
+// bump re-derives nothing differently; WHOOP output unchanged (freeze goldens).
+const String kProtocolPin = 'b4fde6ab5589e53154b808f8b2bbb4d01d9c15b5';
 
 // Fold idempotency, the minimum-nights warm-up, and legacy-payload handling
 // all live in SleepProfilePolicy (pure, unit-tested) — see

pubspec.lock

@@ -946,8 +946,8 @@ packages:
     dependency: "direct main"
     description:
       path: "."
-      ref: "89080bcfac7767b3a871fd3a7d9307f5f30dad26"
-      resolved-ref: "89080bcfac7767b3a871fd3a7d9307f5f30dad26"
+      ref: "b4fde6ab5589e53154b808f8b2bbb4d01d9c15b5"
+      resolved-ref: "b4fde6ab5589e53154b808f8b2bbb4d01d9c15b5"
       url: "https://github.com/OpenStrap/protocol.git"
     source: git
     version: "1.0.0"

pubspec.yaml

@@ -262,7 +262,13 @@ dependencies:
       # REPIN: protocol feat/multidevice-verified-decoders head (multi-device
       # decoders; WHOOP decode untouched, pinned by whoop_freeze_golden_test).
       # Re-point at the merge commit once it lands on protocol main.
-      ref: 89080bcfac7767b3a871fd3a7d9307f5f30dad26
+      # REPIN: protocol main @ b4fde6a (#81: Mi Body Composition Scale 2 answers
+      # the history request with a 7-byte count). The range from 89080bc is 41
+      # commits: #81, the AGPL license/docs (#80), and #82 decoder-hardening
+      # (R10 gated on packet type, hello/battery parsing, reassembler
+      # truncation semantics, removal of deprecated gen5 APIs). #81 sits on top
+      # of #82, so it cannot be pinned alone.
+      ref: b4fde6ab5589e53154b808f8b2bbb4d01d9c15b5
   openstrap_analytics:
     git:
       url: https://github.com/OpenStrap/analytics.git

test/adapters/miscale_test.dart

@@ -151,7 +151,9 @@ void main() {
     final (rows, link) = await _drive(
       kMiScaleComposition,
       reply: (u, v) => switch ((u == kMiScaleHistoryChar, v.first)) {
-        (true, 0x01) => [(kMiScaleHistoryChar, [0x01, 2, 0])],
+        // The XMTZC05HM's real count reply is 7 bytes (captured on hardware);
+        // weights and stamps below are made up.
+        (true, 0x01) => [(kMiScaleHistoryChar, [0x01, 2, 0, 1, 0, 0, 0])],
         (true, 0x02) => [
             (kMiScaleHistoryChar, [
               ..._bc(0x22, 480, 14000, DateTime.utc(2026, 10, 2, 7)),