ConnTTL returns as ConnOption that set default TTL to the connection.

Listen starts to receiving multicast messages.

SendAddr returns an address to send multicast UDP package.

SetRecvAddrIPv4 updates multicast address where to receive packets.

SetSendAddrIPv4 updates a UDP address to send multicast packets.

InterfacesProvider specify a function to list all interfaces to multicast.

SystemAssignedInterface indicates use the system assigned multicast interface or not.

Conn is multicast connection.

ConnOption is option for Listen().

DataProvider provides a body of multicast message to send.