user description descriptor

[balaji]

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]

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.

[Lionel Sacks]

Hi, I'm having a similar problem - close to this, but this doesn't achieve what I'm looking for.

If I run the BLE UART demo, and look in the Master Control Pannel I see a PrimaryService called "UART over BLE" with two attributes "UART RX" and "UART TX". I then create a thrid attribute and do the above and see the thrid attribute with a "CharacteristicUserDescription:UserDescription" of the text I put in... but the attribute is shown as "UUID:: th:eu:ui:d" ...

Where did "UART RX", "UART TX" and "UART over BLE" strings come from? Are they hardwired into S110? Into the Master Control Pannel? They don't show up in a generic Android app... which just gives "Unknown Service" and "Unknown Characteristic"...

Is the CharacteristicUserDescription:UserDescription all we can do, the rest being upto the SIG?

[Bjørn Inge]

Master Control Panel has a list over UUIDs which it recognizes and gives string names to. The list is kept in the file uuid_definitions.txt in the application folder. New UUID names can be added to that file.

[Lionel Sacks]

thanks for the info!

[stema]

Hi, where can I find "uuid_definitions.txt" file? I'm on Nexus 5, Android L (5.0) Thanks in advance