A For MDP 3.0 messaging, a standard technical header is included in all packets sent on Real-Time Feed, Snapshot, and Instrument Recovery Feeds.
Packet sequence number.
A unique sequence number given to each packet sent.
Each channel will have its own separate set of sequence numbers that will increment sequentially with each packet and reset weekly.
UTC Time of message transmission by the Gateway. UTC Timestamps are sent in number of nanoseconds since Unix epoch synced to a master clock to microsecond accuracy.