nRF UART app works on android, not on iOS 8.4

[peterh]

My ANT BLE application runs on a custom board with a nRF51422, SD 310 rev 2.0.0

I can use the nRF UART app on an android phone, but on an iPhone with iOS 8.4 I can't even see the device.

I can see the device in the list in the DFU Tool in the nRF Toolbox, but in nRF UART nothing.

Are there any connection/advertising/timeout/... parameters I should be aware off, in order to use iOS for UART?

[peterh]

I can get the iPhone UART app to work with the ble_app_uart_s110 project, which indicates that my problem is in my parameter setup rather than "just" in the iOS part of the world.

[Hung Bui]

@peterh: Please test with the nrfToolbox (make sure you have latest version). There is an UART profile in the app. It's more up to date than the nRFUart app on iOS.

[peterh]

The one in the toolbox doesn't recognize my device+software either.

As I commented above, the UART app can be used together with the exampleproject, but not with my current code. My current code does however work with android, so the software isn't entirely bad ;-)

[Hung Bui]

@peterh: The iOS app will look for the 128 bit NUS UUID in the advertising packet and only show devices with this in the advertising packet when you connect. The nRFUart Android app scan for any BLE device, and allow you to connect. After connected it will do service discovery and check if the NUS service is available or not.

You may want to edit the source code of the iOS app to not filter for NUS service in advertising packet. Or add the service into the advertising packet.

[peterh]

Got sidetracked, but now I'm back looking at this issue...

You're probably right about the missing 128 bit NUS UUID. Next question is why it isn't there:

In my code the call : err_code = sd_ble_uuid_encode(&uuid, &encoded_size, NULL) returns NRF_ERROR_INVALID_PARAM when I call it with uuid = 1, type = 2 which I believe should represent the NUS. In the example code using SD 110 the same call returns NRF_SUCCESS, so what can I possibly be doing wrong?