Talk:ZMQ REQ Message Source
Mini-tutorial as part of the Example Flowgraph section.
Request/Reply pairs can be used on one, or two separate, flowgraphs to exchange messages.
External Python client (send only)
An external Python program can send messages to a ZMQ REQ Message Source block. An example flowgraph and Python code follow.
GNU Radio as a server
If the GNU Radio flowgraph(s) is configured as a server, the REQ message is processed by the flowgraph and a message is sent back in a REP message as the response. An example flowgraph and Python code follow.