How to write to a custom 128 UUID service using pc-ble-driver-py

RE: How to write to a custom 128 UUID service using pc-ble-driver-py

Jørgen Holmefjord — Tue, 21 Nov 2017 10:42:25 GMT

If you look in the documentation of the Nordic UART service, you can see that the service have the 15-bit offset UUID 0x0001, RX characteristic have 16-bit offset UUID 0x0002, and TX charactertistic have 16-bit offset UUID of 0x0003. Both the service and the two charactertistics use the same base UUID of 6E400000-B5A3-F393-E0A9-E50E24DCCA9E. You should define your charactertistics in the same way, first define the base UUID, and then define the charactertistics UUIDs using this base UUID:

BASE_UUID          = BLEUUIDBase([0x00, 0x11, 0x00, 0x00, 0x22, 0x33, 0x44, 0x55, 
                                  0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD]);
SERIALWRITE_UUID   = BLEUUID(0x20D0, BASE_UUID);
SERIALNOTIFY_UUID  = BLEUUID(0x818B, BASE_UUID);

RE: How to write to a custom 128 UUID service using pc-ble-driver-py

mr_jj — Mon, 20 Nov 2017 16:26:48 GMT

In my custom service, I have a base uuid and a write and notify characteristic. The write characteristic is: add_serialwrite_params.uuid = 0x20D0; And the notify characterisic is: add_serialnotify_params.uuid = 0x818B;

How should the UUID for these custom characteristics be created?

RE: How to write to a custom 128 UUID service using pc-ble-driver-py

mr_jj — Mon, 20 Nov 2017 16:23:44 GMT

I am a bit confused as to what the purpose of this line is: NUS_TX_UUID = BLEUUID(0x0003, BASE_UUID)

RE: How to write to a custom 128 UUID service using pc-ble-driver-py

Jørgen Holmefjord — Thu, 16 Nov 2017 15:00:34 GMT

Hi,

I have not tested with any recent versions of pc-ble-driver-py, but could you check if this solution is working for you?

Best regards,

Jørgen