Using BLE based Accessory

RE: Using BLE based Accessory

Aymen Rejeb — Tue, 26 Apr 2016 13:13:27 GMT

It's clear now, thank you very much for your support.

RE: Using BLE based Accessory

Kenneth — Tue, 26 Apr 2016 12:01:43 GMT

With "learning" mode I mean that when the central receive a notification due to button press, it will assume that if this button is pressed again later, then this is the volume up or down pressed.

RE: Using BLE based Accessory

Aymen Rejeb — Tue, 26 Apr 2016 10:18:32 GMT

Hi, Please, What do you mean exactely by "learning" mode ?

RE: Using BLE based Accessory

Kenneth — Tue, 26 Apr 2016 10:14:56 GMT

I think making a generic parser will be difficult and time consuming. I suggest you make a "learning" mode, where the central search for the HID service and ask the user to press the button it wants to use as a volume up/down.

RE: Using BLE based Accessory

Aymen Rejeb — Mon, 25 Apr 2016 17:02:37 GMT

Hi Kenneth,

Could you please give a hint about that!

B.R

RE: Using BLE based Accessory

Aymen Rejeb — Mon, 25 Apr 2016 13:21:15 GMT

Actually, what I think to do is to use a BLE Selfie Button to communicate with an nRF51822. On the nRF51822 side, I need to implement a custom BLE Central code to detect the button pressed event. Therefore, I need the know if this could be achieved or not?

RE: Using BLE based Accessory

Kenneth — Mon, 25 Apr 2016 10:48:10 GMT

I think it would help to understand what you want to do here. In it's simplest form you can just read all the services and characteristics of the peripheral device, and copy them locally and forward any notification you receive the same way you receive them. In such case you don't even need a parser.

You can even add a "learn mode", where you ask the user to press and release the button in such a case.

RE: Using BLE based Accessory

Aymen Rejeb — Mon, 25 Apr 2016 09:04:04 GMT

Hi Kenneth,

Could you please give more details on the second part of the Q2 ? In another way, do you think that a such parser should implement the whole HOGP central mode features in order to ensure a correct communication with a such BLE based button? and if so, would it be worthwhile? since I only need to send the button status to the central?

B.R.

RE: Using BLE based Accessory

Kenneth — Mon, 25 Apr 2016 08:44:01 GMT

Hi, you will need to use HID over GATT profile (HOGP) if you want to control the camera on a phone. A colleague have made an nrf51_ble_app_hids_kbd_consumercontrol example on Github you can use as reference. Transmitting a volume Up or Down keypress will trigger the camera to take a picture. In your description it seems you want to relay keypress data between a BLE based selfie button and a phone, but in any case you will need to use HOGP on the device connected to the phone. As mentioned here we don't have any parser for HOGP in central mode.