HasAckElicitingFrames returns true if at least one frame is ack-eliciting.

IsFrameAckEliciting returns true if the frame is ack-eliciting.

NewAckHandler creates a new SentPacketHandler and a new ReceivedPacketHandler.

SendAck means an ACK-only packet should be sent.

SendAny means that any packet should be sent.

SendNone means that no packets should be sent.

SendPacingLimited means that the pacer doesn't allow sending of a packet right now, but will do in a little while.

SendPTOAppData means that an Application data probe packet should be sent.

SendPTOHandshake means that a Handshake probe packet should be sent.

SendPTOInitial means that an Initial probe packet should be sent.

FrameHandler handles the acknowledgement and the loss of a frame.

ReceivedPacketHandler handles ACKs needed to send for incoming packets.

SentPacketHandler handles ACKs received for outgoing packets.

The SendMode says what kind of packets can be sent.