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Mi scales: read the 7-byte history count the XMTZC05HM sends #81

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Mi scales: read the 7-byte history count the XMTZC05HM sends #81

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cd9c1bd
Mi scales: read the 7-byte history count the XMTZC05HM sends
Riedel-David Oct 21, 2026
f5d1a9d
Mi scales: document the 7-byte count reply, test more counts
Riedel-David Oct 21, 2026
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13 changes: 10 additions & 3 deletions lib/src/miscale.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,9 @@
//
// STORED HISTORY (both scales) — on [kMiScaleHistoryChar], notify + write:
// host `01 <user id u32 LE>` how many records for this user
// scale `01 <count u16 LE>`
// scale `01 <count u16 LE>` (the XMTZC05HM appends four more bytes,
// seen as `01 00 00 00` after a request for
// user 1; their meaning is not established)
// host `02` send them (skipped when count is 0)
// scale records: 10-byte Scale 2 records, or 13-byte frames laid out as
// 0x2A9C on the composition scale; a notification of one byte or
Expand Down Expand Up @@ -144,9 +146,14 @@ List<int> miScaleHistoryRequest(int userId) => [
(userId >> 24) & 0xff,
];

/// The record count in the scale's `01 <count u16 LE>` answer, or null.
/// The record count in the scale's `01 <count u16 LE>` answer, or null. The
/// Mi Body Composition Scale 2 (XMTZC05HM) answers with 7 bytes: the same
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/// three, then four more (seen as `01 00 00 00` after a request for user 1;
/// whether that is the user id is not established, so it is not validated).
int? miScaleHistoryCount(List<int> b) =>
b.length == 3 && b[0] == 0x01 ? b[1] | (b[2] << 8) : null;
(b.length == 3 || b.length == 7) && b[0] == 0x01
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? b[1] | (b[2] << 8)
: null;

const List<int> kMiScaleHistorySend = [0x02];

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5 changes: 5 additions & 0 deletions test/thermometer_scale_test.dart
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Expand Up @@ -141,6 +141,11 @@ void main() {
expect(miScaleHistoryRequest(0x01020304), [1, 4, 3, 2, 1]);
expect(miScaleHistoryCount([0x01, 0x02, 0x01]), 258);
expect(miScaleHistoryCount([0x01, 0x02]), isNull);
// Captured from a real XMTZC05HM: counts 2, 3 and 4 (tail 01 00 00 00).
expect(miScaleHistoryCount([1, 2, 0, 1, 0, 0, 0]), 2);
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expect(miScaleHistoryCount([1, 3, 0, 1, 0, 0, 0]), 3);
expect(miScaleHistoryCount([1, 4, 0, 1, 0, 0, 0]), 4);
expect(miScaleHistoryCount([1, 2, 0, 1, 0]), isNull);
expect(miScaleHistoryDone([0x03]), isTrue);
expect(miScaleHistoryDone([]), isTrue);
expect(miScaleHistoryDone([0x03, 0]), isFalse);
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