Using Android to Communicate with a BLE HID Device

[bscdb]

Hi,

I'm trying to develop an Android app. My HID device is not a keyboard, mouse nor a gamepad. But my BLE firmware is based on SDK 15.2 & HID keyboard example code. I installed nrfConnect on my Android phone. The connection keeps dropping from nrfConnect app & I'm not able to read/write reports. My Android code connects to the nrf kit & recognizes the HID service UUID but then how do I read & write reports. Also I could read the battery level from battery service. I have kept the firmware code simple & I'm sending 8 bytes input report & receiving 1 byte output report.

[bscdb]

I tried another phone & I could connect & bond. But I could read /write to reports!!

[Sigurd]

So it was a problem with one particular phone ?

If the connection kept dropping, it would be good idea to take a look at the log and the disconnect reason, swipe from left to right in the nRFConnect app to bring up the log. You should also inspect the log on the nRF52-side. 

[bscdb]

Sorry I missed a word in my previous reply. After making the connection, I was 'NOT' able to read/write to reports.

I'm trying to develop an Android app to access input/output reports. My Android code connects to the nrf kit & recognizes the HID service UUID but then how do I read & write to reports?????

[Sigurd]

Did you get any messages in the log when you tried to read/write the reports in nRF-Connect app(swipe from left to right in the nRFConnect app to bring up the log) ?

[bscdb]

Ohh yes, the error was - "Exception occurred (BLUETOOTH_PRIVILEGED permission required)"

[awneil]

So does that resolve your issue? 

If so, please verify the answer:

[bscdb]

No that does not resolve the issue.