HID over GATT

RE: HID over GATT

Edvin — Mon, 24 Sep 2018 10:12:56 GMT

I am not sure the correct way of transferring data to an application is by pretending to be a keyboard. Because when you connect to the computer, it will start to write as if it was the keyboard connected.

I am not exactly sure why the HIDS keyboard isn't working with the parameters that you changed, but it should be easy to figure it out if you do some debugging, like I explained in the previous comment.

However, I think it is better to go with something proprietary, like the ble_app_uart example. Note that you will not get the values from this in a window by default, but you can use a UART terminal, like Putty or Termite to see the data that you send. How to test the example is described here.

Best regards,

Edvin

RE: HID over GATT

bscdb — Wed, 19 Sep 2018 14:23:42 GMT

So you suggest not to use HID? I'm able to connect with computer but not able to send values.

RE: HID over GATT

Edvin — Wed, 19 Sep 2018 09:09:34 GMT

Ok,

It is probably a driver problem. I assume you will find the reason if you debug your application. My guess is that one of the APP_ERROR_CHECK(err_code) receives an err_code != 0 (=NRF_SUCCESS), and the application crashes. Are you able to connect to the device with your computer with these values?

Regardless, are you sure that you want to send this data as a keyboard writing on the computer?

I don't think that the keyboard example is the best way to start transferring values from the ADC measurements.

I suggest that you rather look into e.g. the ble_app_uart example, and try to transfer the data through the NUS service.

Best regards,

Edvin

RE: HID over GATT

bscdb — Tue, 18 Sep 2018 15:55:47 GMT

I changed hids_init() function. My ultimate goal is to create own custom page. If I do so, will there be a driver problem? I want to create an array with 19 elements and each element will correspond to an ADC value received from microcontroller via uart and passed to computer via ble. So I was just trying with a small array having a string "hello". But I'm unable to do so. Please help.

RE: HID over GATT

Edvin — Tue, 18 Sep 2018 14:16:41 GMT

Ok. Is there a particular reason for why you need to change these?

Are OUTPUT_REPORT_MAX_LEN and INPUT_REPORT_KEYS_MAX_LEN the only parameters that you changed?

Best regards,

Edvin

RE: HID over GATT

bscdb — Tue, 18 Sep 2018 14:01:45 GMT

I've just changed the descriptor, rest code is the hid keyboard example from nrf52 sdk15. The example code works fine, I was testing it for custom descriptor. Could you my code above?

RE: HID over GATT

Edvin — Tue, 18 Sep 2018 12:14:39 GMT

Hello,

You say that you use nRF52832, is that correct? The links you are referring to is projects made for the nRF51 series, so they probably won't work with the nRF52.

Have you tested the example located in SDK15.0.0 (or any of the other later SDKs)\examples\ble_peripheral\ble_app_hids_keyboard\pca10040\s132\<your favorite IDE>\

If you use any of the IDEs other than SES, remember to upload the S132 softdevice from the SDK you are using first (SES will do this for you).

Does it work if you use this example?

Best regards,

Edvin