How to configure two notifications on central?

[Chienkai Shih]

Hi,

I used "ble_image_transfer" sample code and can get the all the stuff I want and now I'm implementing the central device for it,

but somehow I always got the "cccd_configure" error when I tried to enable the 2nd notification.

In "ble_image_transfer", one notification is used for image info and configurations, and the other notification is the image's raw data.

The SDK I used is SDK15.2.0 and running on two PCA10056 development kits.

The procedure I did is to,

1. clone "ble_nus_c".

2. add the image characteristic (0x0004).

3. add new handling "its_img_handle" and "its_img_cccd_handle" and related changes in.

4. enable two notifications (tx_notif_enable and img_notif_enable) after discovery completed.

If I only enabled one of the notification, I can receive the data I supposedly to get,

but the problem is that I would like to have two notifications, any idea?

[run_ar]

Hi,

Are you using the correct handle when trying to enable the second notification? can you capture a sniffer trace so I can see what is happening on air?

[Jimmy Wong]

I did the example central role of ble_image_transfer_c (https://github.com/jimmywong2003/nrf5-packet-error-rate-measurement-on-ble-connection) . 

[Chienkai Shih]

Thanks, it resolved my problem and the root cause is because of I didn't wait the response of enabling the 1st notification then directly enable the 2nd notification, that is why it failed. Many thanks.