type t = | Hello| EchoRequest of Packet.bytes| EchoReply of Packet.bytes| FeaturesRequest| FeaturesReply of SwitchFeatures.t| FlowModMsg of OpenFlow0x04_Core.flowMod| GroupModMsg of OpenFlow0x04_Core.groupMod| PacketInMsg of OpenFlow0x04_Core.packetIn| PacketOutMsg of OpenFlow0x04_Core.packetOut| PortStatusMsg of OpenFlow0x04_Core.portStatus| MultipartReq of OpenFlow0x04_Core.multipartRequest| MultipartReply of OpenFlow0x04_Core.multipartReply| BarrierRequest| BarrierReply| Error of Error.tval string_of_msg_code : msg_code -> stringmodule Header : sig ... endval sizeof : t -> intval marshal : OpenFlow0x04_Core.xid -> t -> stringval parse : Header.t -> string -> OpenFlow0x04_Core.xid * t