BLE Central access GATT service from another device

RE: BLE Central access GATT service from another device

Kenneth — Thu, 05 May 2022 07:53:29 GMT

You are assuming that the bytes in questions need to be consecutive, there is no such requirement, you can set both base uuid and the 16bit UUID to service/characteristic to whatever you like.

Kenneth

RE: BLE Central access GATT service from another device

Leo Yang — Wed, 04 May 2022 17:05:39 GMT

Hi Kenneth, Thanks for your reply.

I've read the reply you mentioned. It's about how to add BLE service, but that's not my problem.

Maybe I'm not clear.

I need a nRF52840 as a BLE central to access the GATT service as below.

I want to do things very similar to ble_app_uart_c project, but connected with another device.(ARC EM9D AIoT DK)

Please see the red checks above, the UUID of "CUSTOM SERVICE and CUSTOM CHARACTERISTIC" is not consecutive. So only changing the NUS_BASE_UUID in ble_nus_c.h won't work.

Can you show me more detail about how to access the GATT services? API or other documents I should read.

Many thanks!

RE: BLE Central access GATT service from another device

Kenneth — Wed, 04 May 2022 10:52:20 GMT

Hi,

Please check outmy reply here:
https://devzone.nordicsemi.com/f/nordic-q-a/85327/changing-14-15-octet-of-custom-base-uuid-instead-of-12-13-octet-at-the-sd_ble_uuid_vs_add-ble_uuid128_t-const-p_vs_uuid-uint8_t-p_uuid_type-fucnction-call/355813#355813

Kenneth