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January 29, 2017 11:38
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Yunmai smart scale (M1301, M1302, M1303) Bluetooth LE protocol notes
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| Yunmai smart scale (M1301, M1302, M1303) Bluetooth LE protocol notes | |
| Commands are written to GATT attribute 0xffe9 of service 0xffe5. Responses come | |
| as value change notifications for GATT attribute 0xffe4 of service 0xffe0. These | |
| are 16-bit Bluetooth LE UUIDs, so nnnn is 0000nnnn-0000-1000-8000-00805F9B34FB. | |
| ----- | |
| Packet Structure | |
| 0d - packet start | |
| 1e - scale software version (only in responses) | |
| nn - total packet length (includes packet start and CHK) | |
| nn - command / response opcode | |
| data | |
| CHK - XOR of all bytes except for frame start | |
| Example command: 0d 05 13 00 16 | |
| Example response: 0d 1e 05 05 1e | |
| ------- | |
| Response | |
| BE = big endian (most numbers are big endian) | |
| LE = little endian (the weight stored in a profile is little endian) | |
| 00: 0d - packet start | |
| 01: 1e - scale software version | |
| 02: total packet length (includes packet start and CHK) | |
| 03: response type | |
| 03: 01 - unfinished weighing | |
| 04-07: date (unix time, seconds) - BE uint32 | |
| 08-09: weight - BE uint16 times 0.01 | |
| 10: CHK | |
| 03: 02 - finished weighing | |
| 04: 00 - historical info | |
| 05-08: date (unix time, seconds) - BE uint32 | |
| 09-12: recognized userID - BE uint32 | |
| 13-14: weight - BE uint16 times 0.01 | |
| 15-16: resistance - BE uint 16 | |
| 17-18: fat percentage - BE uint16 times 0.01 | |
| 19: CHK | |
| 03: 06 - result to user operation | |
| 04: operation type - USER_ADD_OR_UPDATE: 1 | USER_ADD_OR_QUERY: 3 | USER_DELETE: 2 | |
| 05-08: userID - 4 bytes, BE | |
| 09: height - in cm | |
| 10: sex - 1 for male | |
| 11: age - in years | |
| 12: waist line - default 85 (0x55) | |
| 13: bust - default 90 (0x5a) | |
| 14-15: basisWeight - default 0, set to previously received weight - LE uint16 times 0.01 | |
| 16: display unit - 1 metric | |
| 03: 17 - device time | |
| 04-07: | |
| 08: CHK | |
| ----- | |
| Command | |
| 00: 0d - packet start | |
| 01: total packet length (includes packet start and CHK) | |
| 02: command | |
| 02: 11 - set time | |
| 03-07: date (unix time, seconds) - BE uint32 | |
| 08: fractional second | |
| 09: CHK | |
| 02: 17 - read time | |
| 03: CHK | |
| 02: 10 - user operation | |
| 03: operation type - USER_ADD_OR_UPDATE: 1 | USER_ADD_OR_QUERY: 3 | USER_DELETE: 2 | |
| 04-07: userID - 4 bytes, BE | |
| 08: height - in cm | |
| 09: sex - 1 for male, 2 for female | |
| 10: age - in years | |
| 11: waist line - default 85 (0x55) | |
| 12: bust - default 90 (0x5a) | |
| 13-14: basisWeight - default 0, set to previously received weight | |
| 15: display unit - 1 for metric, 2 for imperial | |
| 16: body type - always 3 | |
| 17: CHK |
@vitoresende I stopped working with that scale a while back, so I don't know anything past this gist.
The most active effort I'm aware of is at oliexdev/openScale#71
Hi @pwnall, thanks for your answer. In fact I've found my error, the error was on the command I sent to the scale. Thanks!
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Hi @pwnall. Do you know how can I select a user? I've tried operation type 1 and 3 of user operation 10, but I didn't succeed. Could you help me?