Overcome iPhone LMP collision issue (0x002A) for ANCS

[Minh]

Hi everybody!!!

I am working on ANCS on NRF-DK51 (nrf51-sdk-9.0.0) and I get the disconnected reason 0x002A same as this topic. They said that to overcome this problem, we can implement proprietary service which sends notifications/indications every 30s.

Is there any one can tell me how can I implement based on ANCS service ? such as:

• what is service uuid number?
• what are notifications/indications?

Thank you very much.

[run_ar]

Try to do a read of a handle on iOS or send a dummy notification every 20th second. This will verify encryption and should stop the LL_PING_REQ from occuring. If this doesn't help, please provide a sniffer trace showing the problem as well as your iDevice and iOS version.

Edited.

[Minh]

I still get that disconnected problem. I try to get the sniffer trace however it only show the advertising packet. I already read the solution on this however it does not work.

I use Iphone 5 with IOS 9.2.1.

Thank you

[run_ar]

I need a sniffer trace to be able to say why you are disconnected. Please make sure you use the latest Segger driver and that the sniffer is placed in close proximity to the devices generating the traffic. It's best if the sniffer is placed in the middle between the central and peripheral.

[Minh]

Here is my sniffer trace after clean out the empty

In my code I send the

err_code = sd_ble_gattc_read(m_ancs_c.conn_handle,0x00,0);

every 20s however the master sends the error response to the slave

[run_ar]

I see. Apparently doing a read of handle 0x0000 doesn't reset the LL_PING_REQ in iOS. Try reading another characteristic or send a dummy notification of some sort.