bo3-js/netcodedocs/ptype-psub-defs.md

PType and PSub Definitions

A BO3 GameServer packet has a 2 byte header. Byte 1 is PType (packet type), which is used to check whether its serverbound or clientbound, however nonstandard BO3 servers can have the PType above 0x01 Byte 2 is PSub (packet subtype), which is the actual packet name. Each ptype can have 256 different subtypes

PType

0x00 = Clientbound (should never be sent by a client) 0x01 = Serverbound (should never be recieved by a client)

PSub

0x02 = Replication channel 0x01 = Echo (Server will return what you send)