Hi,
I have been going through the Bluetooth Course (https://github.com/NordicPlayground/nRF52-Bluetooth-Course) and I can' seem to make it work, even if copy/paste the code form the repo.
The initial template builds ok, but after adding the custom code I get an error: undefined reference to `ble_cus_init'. I tried nRFSDK 15.0 and nRFSDK15.2 and they both give me the same error.
I am using NetBeans on my mac as described here (https://www.novelbits.io/nrf52-mac-development-tutorial/) - with ble_hrs example building successfully and working on the NRF52 DK.
I hope this initial description is enough, but I am happy to provide more information about the problem/code if needed.
Thanks.