# Protocol

Default port is 28555 for TCP and UDP transport.

For TCP, packets are concatenated to a stream.

For UDP, game packets are concatenated in groups of at least one to form one UDP
packet.

## Protocol packets

All packets are preceeded by its length as u32. The next byte indicates the
type. The following bytes are the parameters.

`Vec<T>` is stored as u32 element count followed by the elements. `Res<T>` is
used to denote 256-bit resource hash referring to data of type T. `Obj` refers
128-bit game objects IDs.

```rs
00 connect(identity: u128)
ff disconnect()
01 request_resource(name: Res)
02 respond_resource(data: Vec<u8>)
03 add(id: Obj, prefab: Res<Prefab>)
04 remove(id: Obj)
05 position(id: Obj, pos: Vec3, rot: Vec3)
06 pose(id: Obj, params: Vec<f32>)
07 parent(parent: Obj, child: Obj)
08 sound(id: Obj, data: Vec<u8>)
09 prefab_index(res: Res)
```

## Resources

Resources are reusable things. They are identified by the SHA-256 hash of their
serialized content. See [resources.md](./resources.md)