To write a user defined string for CHAR_DESCRIPTOR_UUID16, you need to do the following.
1. Add a char description and make the permission readable in wiced_bt_gatt_db.c
CHAR_DESCRIPTOR_UUID16(USER_DESCRIPTOR, GATT_UUID_CHAR_DESCRIPTION, LEGATTDB_PERM_READABLE ),
2. Add USER_DESCRIPTOR in enum in wiced_bt_gatt_db.h
3. In ble_proximity_reporter.c, define a global user_defined_str
static char user_defined_str[] = "Temperature in the room";
4. Add the following switch clause to ble_proximity_gatt_read_request() in ble_proximity_reporter.c
case USER_DESCRIPTOR:
p_attribute_value_source = user_defined_str;
attribute_value_length = sizeof( user_defined_str );
break;
5. In your LightBlue you should now see the string attached to the characteristic
