I cannot find any related information for this.
It seems like evt_gatt_attr_notification->attr_value always has 2 bytes leading zeros.
This means if a write a char value with Attribute_Val_Length = 0x02 and Attribute_Val = 0xCAFE I get a attr_value of e.g. 0x04FF1D010C01081800020000FECA
Where are these two bytes between the correct event_data_length and the attr_value coming from?
