Add support for Yunmai X (YMBS-M268) broadcast-only scale#1418
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Add support for Yunmai X (YMBS-M268) broadcast-only scale#1418pagarsky wants to merge 2 commits into
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The Yunmai X (YMBS-M268) advertises measurements as manufacturer-specific data without a local name and needs no GATT connection (the vendor app calls this device family "YUNMAI-ADV"). Frames echo the device MAC byte-reversed, carry a 0B 74 17 signature, a state byte (live/stable/ final), weight and impedance as u16 BE, and an XOR checksum. Identification uses the frame structure + MAC echo during scans and the advertised 16-bit service UUID 0x1320 for saved-device snapshots (the scale advertises no name to match on). Body composition is derived from weight + impedance via YunmaiLib, like the Yunmai SE/Mini handler. Protocol reverse-engineered from an advertisement capture and confirmed end-to-end against a live measurement driven through this handler (weight and full body composition derived and stored). Unit-test fixtures are synthetic frames built to the observed layout. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Broadcast-only scales such as the Yunmai X advertise no local name, so the saved-scale panel rendered a blank line above the MAC. Fall back to the resolved handler display name when the advertised name is blank. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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@oliexdev sorry for the ping, can you take a look? Would appreciate if this can lend in the next release! ❤️ |
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Summary
Adds a handler for the Yunmai X (YMBS-M268), which was not detected by openScale at all. Unlike the Yunmai SE/Mini (GATT), the Yunmai X broadcasts its measurements as manufacturer-specific advertisement data — no GATT connection, and it advertises no local name (the vendor app calls this device family "YUNMAI-ADV").
Protocol
16-byte manufacturer AD (type
0xFF), reverse-engineered from an advertisement capture and confirmed end-to-end against a live measurement driven through this handler:[0..5][6..8]0B 74 17[9][10]01live,02stable,03final (incl. impedance)[11..12][13..14][15][9..14]Body composition (fat/water/muscle/bone/LBM/visceral fat) is derived from weight + impedance via the existing
YunmaiLib, consistent with the Yunmai SE/Mini handler.Identification
The scale advertises no name, so matching uses the frame structure — MAC echo +
0B 74 17signature + checksum — during scans, and the advertised 16-bit service UUID0x1320for saved-device snapshots (which carry no manufacturer data). These checks distinguish it from other 14-byte manufacturer frames from nearby devices.Changes
YunmaiXHandler(+YunmaiXAdvparser), registered inScaleFactory.Testing
./gradlew testDebugUnitTestpasses (15 new tests, 0 failures);assembleDebugbuilds. Validated on real hardware: a full barefoot measurement produced weight + impedance and full derived body composition stored in openScale.