acknack

When we call DataWriter::write() , we expect to see a user data packet sent on the wire, but under what conditions will Connext DDS send packets of its own accord? There are many reasons why Connext DDS may send messages other than user data. Some of the more common reasons are described below. ...
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The DDS reliability protocol uses Heartbeat messages and ACKNACK messages to ensure the receipt of data. A DataReader sends an ACKNACK message in response to a DataWriter’s Heartbeat; this ACKNACK message indicates which samples the reader received, and which samples it has yet to receive. For ...
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