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Created Trisa Body Analyze (markdown)
OliE
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Trisa-Body-Analyze.md
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181
Trisa-Body-Analyze.md
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**notes from https://github.com/maksverver/trisa-body-analyze**
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# Trisa Body Analyze 4.0
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Device name: 11257B*
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Generic type: Transtek_WS1257B
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In App: "1257B" maps to "GBF-1257-B" (note: single leading 1)
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*If the host sets the broadcast id when pairing, then the device name becomes
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"01257Baabbccdd" where <aabbccdd> is the hex-encoded broadcast id (uppercase).
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Note that the device name prefix has changed from "11257B" to "01257B"!
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```
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% btgatt-client -d ${MAC} -t random
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service - start: 0x0001, end: 0x0007, type: primary, uuid: 00001800-0000-1000-8000-00805f9b34fb
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charac - start: 0x0002, value: 0x0003, props: 0x0e, ext_props: 0x0000, uuid: 00002a00-0000-1000-8000-00805f9b34fb
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charac - start: 0x0004, value: 0x0005, props: 0x02, ext_props: 0x0000, uuid: 00002a01-0000-1000-8000-00805f9b34fb
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charac - start: 0x0006, value: 0x0007, props: 0x02, ext_props: 0x0000, uuid: 00002a04-0000-1000-8000-00805f9b34fb
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service - start: 0x0008, end: 0x0008, type: primary, uuid: 00001801-0000-1000-8000-00805f9b34fb
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service - start: 0x0009, end: 0x0018, type: primary, uuid: 0000180a-0000-1000-8000-00805f9b34fb
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charac - start: 0x000a, value: 0x000b, props: 0x02, ext_props: 0x0000, uuid: 00002a25-0000-1000-8000-00805f9b34fb
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descr - handle: 0x000c, uuid: 00002904-0000-1000-8000-00805f9b34fb
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charac - start: 0x000d, value: 0x000e, props: 0x02, ext_props: 0x0000, uuid: 00002a27-0000-1000-8000-00805f9b34fb
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descr - handle: 0x000f, uuid: 00002904-0000-1000-8000-00805f9b34fb
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charac - start: 0x0010, value: 0x0011, props: 0x02, ext_props: 0x0000, uuid: 00002a26-0000-1000-8000-00805f9b34fb
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descr - handle: 0x0012, uuid: 00002904-0000-1000-8000-00805f9b34fb
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charac - start: 0x0013, value: 0x0014, props: 0x02, ext_props: 0x0000, uuid: 00002a29-0000-1000-8000-00805f9b34fb
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descr - handle: 0x0015, uuid: 00002904-0000-1000-8000-00805f9b34fb
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charac - start: 0x0016, value: 0x0017, props: 0x02, ext_props: 0x0000, uuid: 00002a28-0000-1000-8000-00805f9b34fb
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descr - handle: 0x0018, uuid: 00002904-0000-1000-8000-00805f9b34fb
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service - start: 0x0019, end: 0xffff, type: primary, uuid: 00007802-0000-1000-8000-00805f9b34fb
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charac - start: 0x001a, value: 0x001b, props: 0x20, ext_props: 0x0000, uuid: 00008a21-0000-1000-8000-00805f9b34fb
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descr - handle: 0x001c, uuid: 00002902-0000-1000-8000-00805f9b34fb
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charac - start: 0x001d, value: 0x001e, props: 0x20, ext_props: 0x0000, uuid: 00008a22-0000-1000-8000-00805f9b34fb
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descr - handle: 0x001f, uuid: 00002902-0000-1000-8000-00805f9b34fb
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charac - start: 0x0020, value: 0x0021, props: 0x02, ext_props: 0x0000, uuid: 00008a20-0000-1000-8000-00805f9b34fb
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charac - start: 0x0022, value: 0x0023, props: 0x08, ext_props: 0x0000, uuid: 00008a81-0000-1000-8000-00805f9b34fb
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charac - start: 0x0024, value: 0x0025, props: 0x20, ext_props: 0x0000, uuid: 00008a82-0000-1000-8000-00805f9b34fb
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descr - handle: 0x0026, uuid: 00002902-0000-1000-8000-00805f9b34fb
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```
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Properties: 1 broadcast, 2 read, 4, write-without-response, 8 write-with-response, 0x10 notify, 0x20 indicate
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https://www.bluetooth.com/specifications/gatt/generic-attributes-overview
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https://github.com/oliexdev/openScale
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## Services & Characteristics:
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```
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1800 Generic Access
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2a00 Device Name
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2a01 Appearance
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2a04 Peripheral Preferred Connection Parameters
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1801 Generic Attribute
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180a Device Information
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2a25 Serial Number String ("80BAAB3279E6")
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2a27 Hardware Revision String ("B2")
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2a26 Firmware Revision String ("2.4")
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2a29 Manufacturer Name String ("Transtek")
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2a28 Software Revision String ("A2")
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78b2 Weight Scale Service
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8a20 (readable) value 0x21 "Feature" returns 00 00
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8a21 (indicate) value 0x1b "Measurement"
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8a22 (indicate) value 0x1e "Append Measurement"
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8a81 (writable) value 0x23 "Download Information or Command"
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8a82 (indicate) value 0x25 "Upload Information or Command"
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```
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Looks similar to:
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https://github.com/oliexdev/openScale/wiki/Medisana-BS444#bluetooth-4x-services--characteristics
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Information below was extracted by disassembling the Trisa Vital Bluetooth app
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(discontinued) and snooping on Bluetooth traffic sent by the MedM Health app.
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## GENERAL PROTOCOL
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To pair:
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- Put the device in pair mode (hold button for several seconds).
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- Connect via Bluetooth.
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- Register for notifications from characteristics 8a21, 8a22, 8a82.
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- Receive from 8a82: `a0AABBCCDD' (where AABBCCDD is a 32-bit password)
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Save the password somewhere.
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- Send to 8a81: `21AABBCCDD` (0x21: set broadcast id to AABBCCDD)
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- Send to 8a81: `22` (0x22: disconnect)
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- Disconnect from device to complete pairing!
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To read measurements:
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- Connect via Bluetooth.
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- Register for notifications from characteristics 8a21, 8a22, 8a82.
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- Receive from 8a82: `a1AABBCCDD' (where AABBCCDD is a 32-bit challenge)
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- Send to 8a81: `20AABBCCDD' (where AABBCCDD are the bytes obtained by XOR'ing
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the challenge with the password, obtained by pairing).
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- Send to 8a81: `02AABBCCDD' (where AABBCCDD is a 32-bit little endian integer,
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the number of seconds passed since 2010-01-01 00:00:00 UTC).
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- Now the device will send past measurements and new measurements as they come
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in, from characteristic 8a21 instead of 8a82.
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Receive from 8a81: 20-byte weight measurument data (see below)
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- When done, send `22` (0x22: disconnect) and disconnect.
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## WEIGHT MEASUREMENT DATA
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Response look like:
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```
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df 28:1e:00:fe 04:0a:70:10 00:00:00:ff 60:14:00:ff 00 09 00
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9f d0:02:00:fe bf:19:70:10 00:00:00:ff 00:00:00:ff 00 09 00
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9f 5a:1e:00:fe ff:19:70:10 00:00:00:ff 03:14:00:ff 00 09 00
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info weight_kg timestamp resistance1 resistance2 uid stat ??
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```
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Info byte contains display unit (bits 5-6)
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First bit contains display units, and indicates which other fields are present.
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```
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bit 0: is timestamp present?
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bit 1: is resistance1 present?
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bit 2: is resistance2 present?
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bit 3: is user number present?
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bit 4: is measurement status present?
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bit 5-6: unit 0x00 = Kg, 0x20 = Lb, 0x40 = St, 0x60 = Kg (too!)
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bit 7: unknown
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```
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Timestamp: 32-bit little-endian integer (offset since 2010-01-01 00:00:00).
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Weight and resistances are encoded as base-10 floating point numbers, comprised
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of a 24-bit little-endian mantissa and an 8-bit signed exponent. Value is
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mantissa * pow(10, exponent).
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Resistance1 seems to be always 0.
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Measurement status contains three enum fields:
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```
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bit 0:
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0: MEASUREMENT_STATUS_WEIGHT_STATUS_WEIGHT_UNSTABLE
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1: MEASUREMENT_STATUS_WEIGHT_STATUS_WEIGHT_STABLE
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bit 1-3:
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0x0: MEASUREMENT_STATUS_IMPEDANCE_STATUS_IDLE
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0x2: MEASUREMENT_STATUS_IMPEDANCE_STATUS_PROCESSING
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0x4: MEASUREMENT_STATUS_IMPEDANCE_STATUS_SHOES
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0x6: MEASUREMENT_STATUS_IMPEDANCE_STATUS_BAREFOOT
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0x8: MEASUREMENT_STATUS_IMPEDANCE_STATUS_FINISH
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0xa: MEASUREMENT_STATUS_IMPEDANCE_STATUS_ERROR
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bit 4:
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hasAppendMeasurement (meaning unknown; seems to be always false)
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```
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Final byte is always 0.
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Another example:
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```
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9f:ba:1d:00:fe:32:2b:71:10:00:00:00:ff:8d:14:00:ff:00:09:00
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```
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From the app:
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```
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timestamp = Fri Sep 28 17:34 CEST 2018
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weight = 76.1 kg
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BMI 24.8, Fat: 18.3% Muscles: 43.2% Water: 60.6% Bones: 3.4 kg
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```
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Another example:
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```
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9f:b0:1d:00:fe:dc:2f:81:10:00:00:00:ff:0a:15:00:ff:00:09:00
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```
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```
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WeightScaleMeasurementData(
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weight_kg=76.0,
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display_unit=<WeightUnit.KILOGRAM: 0>,
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timestamp=1539205852,
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resistance1=0.0,
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resistance2=538.6,
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user_number=0,
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measurement_weight_status=<MeasurementWeightStatus.STABLE: 1>,
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measurement_impedance_status=<MeasurementImpedanceStatus.FINISH: 4>,
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has_append_measurement_data=False)
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```
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From the MedM health app (user profile: male, 186 cm, 36 years old)
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```
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BMI 21.9, Fat: 14.6%, Muscles: 43.4%, Water: 64.4%, Bones: 3.4 kg
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Basal Metabolic Rate: 2776 kcal
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```
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