pub struct ControlPacket {
    type_and_flags: u8,
    length: u16,
    variable_header: Option<Vec<u8>>,
    properties: Option<Vec<u8>>,
    payload: Option<Vec<u8>>,
}

impl<'a> From<&'a ControlPacket> for &'a [u8] {
    fn from(packet: &'a ControlPacket) -> &'a [u8] {
        packet.payload.as_ref().unwrap()
    }
}