Discovering problem for different 128-bit service and characteristic uuid as a central device

[secondbest]

Hello;

I am using NRF51822 with SDK12.3 as a central device. I want to discover and connect a peripheral bluetooth device by using my NRF51822 central device.

If the service and characteristic is the same, for example service uuid is "00002234-b38d-4985-720e-0f993a68ee41" and characteristic uuid is "00002235-b38d-4985-720e-0f993a68ee41" , I can enable the notification of the characteristic and NRF51 get data from this peripheral device by using this characteristic.

However, If the service and characteristic is the different, for example service uuid is "680c21d9-c946-4c1f-9c11-baa1c21329e7" and characteristic uuid is "003bbdf2-c634-4b3d-ab56-7ec889b89a37", I can connect to this device but NRF51 discovers all characteristics as 0x00 and cannot enable the notification.

Is there a way to handle this problem?

Thanks.

[Dominic]

Can we get a clear answer from someone on the Nordic team whether this is a known limitation for nrf52-based central devices?

I am trying to interface the nrf52 with a BLE pulse oximeter. One of its custom services has the following UUIDs:

Service UUID: 0x46A970E00D5F11E28B5E0002A5D5C51B

      Char 1 UUID: 0x0AAD7EA00D60AAE28E3C0002A5D5C51B

      Char 2 UUID: 0x34E2786376FF4F8E96F19E3993AA6199

I have added all associated service and char UUIDs with sd_ble_uuid_vs_add() and scan for all services by calling sd_ble_gattc_primary_services_discover(conn_handle, disc_start_handle, NULL);

Services with characteristics that share the same base UUID are discovered correctly, but services such as the example above resolve to 0 for their UUID and type.

Is there any way to resolve services with different base UUIDs in their characteristics?

Thanks

[Bjørn Kvaale]

Sorry for the delayed response. I have been on a business trip last week & am now on vacation. I would please suggest you to open a new devzone case regarding this query. It may take slightly longer to reply to DevZone cases this week, as DevZone is understaffed due to Easter break.

[Nandi]

I am having the same problem on SDK15.3 S140 ble_app_uart_c, how can I solve it?

[Bjørn Kvaale]

Could you please create a new devzone case please?

[secondbest]

Could you please share new devzone case adress? I wanna learn that it is possible. Thanks.

[Bjørn Kvaale]

Here.

[secondbest]

Hi, I asked for devzone case adress that indicate new questions, from Nandi . You are sharing with me only question & answer screen. I dont want to that.

[Bjørn Kvaale]

You can find Nandi's latest questions here. Just click on the user's name & then go to the Questions tab.