Has reports whether f contains all (0 or more) flags in v.

NewPacket 一定要记得 pkt.Release().

NewPacketReadWriter creates a packet connection based on network connection.

NOTE 如果需要通过chan 或者其他方式给其他协程使用，一定要retain，release NOTE 如果需要通过chan 或者其他方式给其他协程使用，一定要retain，release NOTE 如果需要通过chan 或者其他方式给其他协程使用，一定要retain，release Packet is a packet for sending data.

PacketReadWriter is a connection that send and receive data packets upon a network stream connection.

A Option sets options such as credentials, codec and keepalive parameters, etc.