Read battery level from scale

[keptenkurk]

Is it possible to read the battery level from the device. The Bluetooth standard suggests it should have one (tnx @DjZU) https://www.bluetooth.com/specifications/gatt/viewer?attributeXmlFile=org.bluetooth.service.battery_service.xml

[DjZU]

Not very promising.

sudo gatttool --adapter hci0 --device 00:00:00:00:00:00 --addr-type random --interactive

[00:00:00:00:00:00][LE]> connect Attempting to connect to 00:00:00:00:00:00 Connection successful [00:00:00:00:00:00][LE]> primary attr handle: 0x0001, end grp handle: 0x0007 uuid: 00001800-0000-1000-8000-00805f9b34fb attr handle: 0x0008, end grp handle: 0x0008 uuid: 00001801-0000-1000-8000-00805f9b34fb attr handle: 0x0009, end grp handle: 0x0018 uuid: 0000180a-0000-1000-8000-00805f9b34fb attr handle: 0x0019, end grp handle: 0xffff uuid: 000078b2-0000-1000-8000-00805f9b34fb [00:00:00:00:00:00][LE]> characteristics handle: 0x0002, char properties: 0x0e, char value handle: 0x0003, uuid: 00002a00-0000-1000-8000-00805f9b34fb handle: 0x0004, char properties: 0x02, char value handle: 0x0005, uuid: 00002a01-0000-1000-8000-00805f9b34fb handle: 0x0006, char properties: 0x02, char value handle: 0x0007, uuid: 00002a04-0000-1000-8000-00805f9b34fb handle: 0x000a, char properties: 0x02, char value handle: 0x000b, uuid: 00002a25-0000-1000-8000-00805f9b34fb handle: 0x000d, char properties: 0x02, char value handle: 0x000e, uuid: 00002a27-0000-1000-8000-00805f9b34fb handle: 0x0010, char properties: 0x02, char value handle: 0x0011, uuid: 00002a26-0000-1000-8000-00805f9b34fb handle: 0x0013, char properties: 0x02, char value handle: 0x0014, uuid: 00002a29-0000-1000-8000-00805f9b34fb handle: 0x0016, char properties: 0x02, char value handle: 0x0017, uuid: 00002a28-0000-1000-8000-00805f9b34fb handle: 0x001a, char properties: 0x20, char value handle: 0x001b, uuid: 00008a21-0000-1000-8000-00805f9b34fb handle: 0x001d, char properties: 0x20, char value handle: 0x001e, uuid: 00008a22-0000-1000-8000-00805f9b34fb handle: 0x0020, char properties: 0x02, char value handle: 0x0021, uuid: 00008a20-0000-1000-8000-00805f9b34fb handle: 0x0022, char properties: 0x08, char value handle: 0x0023, uuid: 00008a81-0000-1000-8000-00805f9b34fb handle: 0x0024, char properties: 0x20, char value handle: 0x0025, uuid: 00008a82-0000-1000-8000-00805f9b34fb

Primary returns 4 services: 1800 is Generic Access 1801 is Generic Attribute 180a is Device Information 78b2 is Weight Scale

Note that battery service 180f is not showing up. Also, the Weight Scale service is not 181d as suggested in the specifications.

Since:

• I've seen examples on the net where battery service was existing for heart rate device, powered with I guess a smaller battery than in our scales,
• according to @keptenkurk experience, the batteries in our scales will last long, so it does make sense not having battery level notification,
• as far as I know, the manufacturer Android application doesn't show battery level.

Then my conclusion is that unfortunately our scales (at least the BS444) will not notify about the battery level.