DDS-SPY is a network monitoring and test tool for MilSOFT DDS middleware. It listens DDS domain and displays application subscribing or publishing to DDS domain. It also displays content of the data published by applications. User can select and topic and monitors transmitted data on that topic.

DDS spy also allows users to transmit topic data to domain. User can generate sample data fill related files and transmit to middleware. It is possible to transmit multiple topics and their multiple samples and instances with relative timestamps. User can copy retransmitted data from listen screens and paste to transmit screens for editing and retransmitting.

DDS SPY tool allows developers to debug their software, generate test data for their software. It also helps test engineers for testing system wide requirements. This is a vital tool for system integration error locating and diagnosis.