HID on iOS

[nrbrook]

I'm developing a nRF52832 based HID device and I'm at a bit of a loss as to why it isn't working on iOS. The device works as a keyboard fine on macOS, and it connects and pairs on iOS, but it doesn't work – the virtual keyboard doesn't disappear and keyboard inputs don't work. The HID keyboard example App does work with the same iOS device. The HID report map is ok, I've copied it to the example App and got it working there. The HID service configuration in our app and the example app is identical. Perhaps it is the connection interval or something, but the same interval works on our previous device model. Do you have any recommendations for debugging this issue on iOS? 

[nrbrook]

The problem was two of my strings in the device information service had a length which was 1 greater than the length of the string (i.e., they had the length of the string including the terminating null character). When modified to be the correct length, it works.