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NUS (nRF UART app) error 6 or 9

Hi, I'm using my custom board with NordicSemi nRF51822-QFAA and J-Link.

(Softdevice S110 7.1, SDK 7.2, and using IAR for ARM 7.1)

I was testing the NUS example using the nRF UART app. The test device was iPhone 5S (iOS 8.1.3).

The NUS example worked fine. So I added HID service and test it again.

However sometimes, I received an error message like this :

Log : Did connect to Nordic_Keyboard


Log : Did disconnect from Nordic_Keyboard, error code 6

In which case this error code 6 appears?

Also sometimes error code 9 appears as well. Can I view the lists of error codes?

-Regards, Mango922

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