Can't discover services on nrf52832 with iPhones

[Johnny_8]

Hi,

I'm trying to connect and discover services of a BLE device equipped with a nrf52832. The device advertises correctly and i can see it on the nrf Connect app on both iOS and Android platforms. However, when i try to connect the ble device and discover its services, only the Android platform is successful. With iOS (tried with iPhone 6 with iOS 10.3.3 and iPhone 5s with iOS 9.1) the ble device seems to connect but services are not discovered and, after some time, i get a disconnection.

I have followed the Design Guidelines provided by Apple setting the connection parameters as follows:

#define MIN_CONN_INTERVAL                MSEC_TO_UNITS(100, UNIT_1_25_MS)     
#define MAX_CONN_INTERVAL                MSEC_TO_UNITS(250, UNIT_1_25_MS)           
#define SLAVE_LATENCY                    0                                    
#define CONN_SUP_TIMEOUT                 MSEC_TO_UNITS(4000, UNIT_10_MS)            
#define FIRST_CONN_PARAMS_UPDATE_DELAY   APP_TIMER_TICKS(5000)

#define NEXT_CONN_PARAMS_UPDATE_DELAY    APP_TIMER_TICKS(30000) 
#define MAX_CONN_PARAMS_UPDATE_COUNT     20

The soft device version is S132. Any idea of what could be wrong for the iOS platform?

Thank you in advance

[Bjørn Kvaale]

Could you try flashing and building the ble_app_hrs example on your nrf52 and then start the HRM app in the nRF Toolbox app in iOS? Does it work to connect your nrf52 to your iPhone that way?

[Nestor Matas]

I am experiencing the same issue. The weird thing is that the BLE code is the same one I was using in another project for nRF51422 using SDK 6, and I am able to see the services for that other project with the same iPhone that is failing to list the services of the new nRF52832. Android works on both chips. Any news on this?

[Nestor Matas]

You may want to take a look at this other question devzone.nordicsemi.com/.../ It solved the issue for me, seems that the way gatt events are being processed has changed since SDK 13.