Packet coding based network communication

A communication apparatus comprising a first device having an interface for passing messages to and from a second device over a communication path coupling the first device to second device, the first device further comprising communication controller configured to

• generate one or more redundancy messages from data messages at the first node using an error correcting code;
• transmit messages from the first node to the second node over the data path, the transmitted messages including the data messages and the one or more redundancy messages;
• receive a first plurality of messages at the first node from the second node, including
• receiving messages indicative of a rate of arrival at the second node of the transmitted messages from the first node, and
• receiving messages indicative of successful and unsuccessful delivery of the transmitted messages from the first node to the second node;
• maintain a first transmission limit according to the first plurality of messages;
• maintain a second transmission limit according to the received messages, including maintaining a window size;
• and
• limit transmission of further messages according to the first transmission limit, and according to the second transmission limit, wherein limiting transmission of the further messages according to the second transmission limit includes limiting a number of messages not yet acknowledged as successfully delivered to the second node according to the window size.