Function build_timecode_packet 

pub fn build_timecode_packet(
    buffer: &mut PacketBuffer,
    stream: u8,
    hours: u8,
    minutes: u8,
    seconds: u8,
    frames: u8,
    tc_type: u8,
    tuid: &[u8; 6],
    endpoint: u16,
    mfg_code: u16,
    session_id: u32,
    seq_num: u32,
    sender_key: &[u8],
    message_id: u16,
    scope: &str,
) -> Result<()>

Build timecode packet (§11.2.5). URI: /sig-net/v1//timecode/{stream} → <mult_time> = 239.254.255.250