# Functions
HasRetransmittableFrames returns true if at least one frame is retransmittable.
IsFrameRetransmittable returns true if the frame should be retransmitted.
NewPacketList returns an initialized list.
NewReceivedPacketHandler creates a new receivedPacketHandler.
NewSentPacketHandler creates a new sentPacketHandler.
# Constants
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.
SendPTO means that a probe packet should be sent.
SendRetransmission means that retransmissions should be sent.
# Structs
A Packet is a packet.
PacketElement is an element of a linked list.
PacketList is a linked list of Packets.
# Interfaces
ReceivedPacketHandler handles ACKs needed to send for incoming packets.
SentPacketHandler handles ACKs received for outgoing packets.
# Type aliases
The SendMode says what kind of packets can be sent.