How can I get the primary service uuid?

[Jim]

Hi! 

I want to get the primary service uuid,

How can I do that? 

I use nRF52832, SDK 12.1.0, Softdevice 3.0.0. 

Thank you..

[run_ar]

Hi,

Can you please elaborate? Are you doing service discovery using the sd? if that is the case you will get a BLE_UUID_TYPE_UNKNOWN when you are doing a sd_ble_gattc_primary_services_discover.

If that happens you should use sd_ble_gattc_attr_info_discover to fetch with the handle range for the unknown UUID to get this from the peer.

[Jim]

Thank you for your answer!

I found the UUID I was looking for. However, when the iPhone enters the background, the UUID can not be found. Is there a way to find if the iPhone is in the background?

[run_ar]

Please check the core Bluetooth programming guide -> Core Bluetooth background processing for iOS Apps.