nrf5 SDK 14.2.0 cannot be connected by ios

[weizhen]

hi, I am updating the sdk from 12.2.0 to 14.2.0, and using softdevice s132. I get a problem by connecting device using ios devices, but it works fine with android device. do you know what should I do? 

[emdi]

You'll need to handle ATT MTU and Data Length negotiation.

There is a library in the SDK to facilitate that, called nrf_ble_gatt, it is used in ble_app_hrs.

[weizhen]

I tried that, but it still not works for me. also the example ble_app_multiperipheral do not set ATT MTU, but that works fine.

[David Edwin]

Can you post a sniffer trace and the softdevice version that you are using ?

[weizhen]

I am using S132 5.0.0 with SDK14.2.0. what's sniffer trace?

[Toyman]

The answer is here, at devzone. I personally faced the same issue. The problem is that iOS devices require MTU negotiation.

Just add the following into ble_evt_handler():

case BLE_GATTS_EVT_EXCHANGE_MTU_REQUEST:
			err_code=sd_ble_gatts_exchange_mtu_reply(p_ble_evt->evt.gatts_evt.conn_handle, 23);
			APP_ERROR_CHECK(err_code);
            break;