0x08 disconnection occurs when the ios mobile phone is connected to the device

Question

Based on sdk12.3, use 51-dk (51822) to run the ble_app_hrs routine.
Use ios mobile phone to connect the device, it will automatically disconnect after 30 minutes, the disconnection reason is 13 (0x80).
How can this be solved?

Stian Røed Hafskjold · Accepted Answer

The clock is automatically calibrated by the softdevice. Are you calling that function in intervals, or is it just at the beginning of main? In any case, it is not really necessary. Anyways, if it always works fine within 3 meters I think we can rule out any clock drifting problems.You can of course try to set the clock accuracy to 500ppm and see if the problem improves. 
 Since it is working on the Android phones I think we can maybe rule out that the problem lies with the nRF51. So it sounds to me like there are some issues with the receiver on the iPhone. Can you please let me know the model number of the iPhone you are testing with, and I can check if we have experienced similar issues before.

0x08 disconnection occurs when the ios mobile phone is connected to the device

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