user description descriptor

Question

Hi,
How to set user description descriptor to a particular attribute? I have created one primary gatt service with more than four characteristics, when is see it through the master control panel, i get confuse on which is belongs to which characteristics. I have attached the snap of my master control panel, please suggest me how to add descriptors like battery level, device name in some other characteristics. 
 Regards,
Balaji

Ole Morten · Accepted Answer

Adding a User Description Descriptor should just require setting 3 additional fields in the ble_gatts_char_md_t: 
 
 char_md.p_char_user_desc = (uint8_t *) user_desc;
 char_md.char_user_desc_size = strlen(user_desc);
 char_md.char_user_desc_max_size = strlen(user_desc);

 
 Based on your screenshot, it seems as if you've forgotten to set the size parameters, but have a memset on the structure, setting all fields to 0, essentially giving you a 0-length user description.