About disconnection issue on IOS

[muralikrishnan]

Hai,

we are using nRF52832  and Nordic connect for our development and testing work

we are facing disconnection issue on android after ~3min so we changed the CONNECTION_MIN_INTERVAL=8 to 15ms,CONNECTION_MAX_INTERVAL=10 to 20ms

now andriod disconnection issue solved but IOS disconnection issue was not yet solved using Nordic connect ,

Test case

we changed the interval of min and max interval =(30 to 50) (not working)

we changed the interval of min and max interval =(20 to 100) (not working)

so kindly proved some solution for this 

[Mttrinh]

Hi,

Could you also tell me which example you are using and if you have made any modifications to it?

Could you also tell me which iOS devices you used for testing and which iOS version they are running? If you have only tested with one iOS device, could you try with other iOS devices as well?

[muralikrishnan]

Hi,

we used i phone 10 XR  then no modification done

[Mttrinh]

Hi,

Could you answer all of my questions in the previous reply? It helps me narrow it down, and easier for me to help you.

Mttrinh said:

Could you also tell me which example you are using and if you have made any modifications to it?

Could you also tell me which iOS devices you used for testing and which iOS version they are running? If you have only tested with one iOS device, could you try with other iOS devices as well?

[SorenKonekt]

Hello, we have exactly same issue on an NRF52832, softdevice S132, NRF SDK 15, various iphone models, but especially iphone 7 (13.3) and iphone 6s (newest possible IOS).. iphone 6 seems to be much less affected by this than 6s for some reason. Perhaps due to the IOS version.
When I put the iphone aside and sleep the screen, I can see on device log that connection parameters are changed to:
min conn. interval: 480ms
max conn. interval: 480ms

conn. timeout : 4s

slave latency: 0

Phone and device will eventually loose connection, and this seems to be very random. Sometimes it takes several hours to reproduce, and sometimes it happens 4-6 times in one hour.

This is getting very critical and we are ready to try more or less anything. Please Mttrinh if you can provide us with any guidelines or ideas, this is very useful. 

Best

Søren

[Mttrinh]

Hi,

What have you set your connection parameteres to? If you haven't already done so, I would recommend checking out the "Accessory Design Guidelines for Apple Devices" link in my first reply.

What softdevice version are you using? Are you using an example from our SDK to test this? Have you done any modifications to the example?

If you have access to other phones, could you try testing with the same models but different iOS? To check if the iOS version affects the connection.

Also a sniffer trace would be helpful to see what happens over-the-air in the different scenarios.