The protocol used by the Live Link Face app is quite simple it only contains a header and up to 61 blendshape values.
The structure of the packet looks something like this.
struct Packet {
magic_1: u8,
id_length: u32,
id: str,
name_length: u32,
name: str,
timestamp: u64
magic_2: u64
blendshapes: Option<[f32; 61]>
}The header of the packet contains a device id, the name of the device and a timestamp. This data is continiously sent to the server the blendshape values on the other hand are only sent when a face is present in the frame.
The device name can be altered inside of the app settings while the id seems to be unique per device and cannot be changed.
The first magic value magic_1 seems to be the version of the protocol (at the moment of writing this there are two major versions),
the second one magic_2 might be part of the time code but this is yet to be figured out.
With the timecode im still not sure what to do with it, for the moment it can be used to compare two packets but im still working on translating it to some useful date/time.