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= Understanding ZMQ Blocks =
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Barry Duggan is a graduate of Georgia Tech in Electrical Engineering and is a career computer programmer specializing in real-time control, data communication systems, and email security. He has been an amateur radio operator since 1953, and now devotes most of his time to the GNU Radio project. He is a member of the GNU Radio General Assembly, the GRCon21 Organizing Committee, and is currently the Documentation Lead for GNURadio.
 
 
<b>This tutorial is under construction.</b>
 
 
 
This tutorial presents the GNU Radio ZMQ blocks. It is a set of six Source Blocks and six Sink Blocks. The naming convention follows other source and sink blocks in that a source block provides data entering a GNU Radio flowgraph and a sink block sends data out of the flowgraph. It is a flowgraph-oriented perspective.
 
 
 
From the [https://zeromq.org/ ZeroMQ] website: "ZeroMQ (also known as ØMQ, 0MQ, or zmq) looks like an embeddable networking library but acts like a concurrency framework. It gives you sockets that carry atomic messages across various transports like in-process, inter-process, TCP, and multicast."
 
 
 
== Prerequisites ==
 
 
 
* [[Guided_Tutorial_GRC|'''Intro to GR usage: GRC and flowgraphs''']]
 
* [[Sample_Rate_Tutorial|'''Understanding sample rate''']]
 
 
 
== Types of ZMQ Blocks ==
 
 
 
The two basic groups of ZMQ blocks are those which transport stream data, and those which transport text strings. They are described below.
 
 
 
ZMQ blocks come in pairs:
 
* PUB - SUB
 
* PUSH - PULL
 
* REQ - REP
 
 
 
The PUB, PUSH, and REP blocks are always sink blocks; the others are source blocks. Choosing which pair to use depends on your system architecture.
 
* The PUB - SUB pair can be compared to broadcasting. The PUBlish sink sends out data which can be received by one or many SUBscribers.
 
* The PUSH - PULL is a point to point link of equal peers.
 
* REQuest - REPly pair is a point to point link which operates in lock-step: one REQ in gives one REP out. This case changes the perspective somewhat in that the flowgraph is acting as a server for a remote client.
 
 
 
=== Data Blocks ===
 
 
 
=== Message Blocks ===
 
 
 
== Using ZMQ Blocks ==
 
 
 
=== Separate GR flowgraphs on Same Computer ===
 
 
 
=== Separate GR flowgraphs on Different Computers ===
 
 
 
=== Python Program as Destination of ZMQ Block ===
 
 
 
=== Python Program as Source to ZMQ Block ===
 

Latest revision as of 19:10, 22 July 2021

Barry Duggan is a graduate of Georgia Tech in Electrical Engineering and is a career computer programmer specializing in real-time control, data communication systems, and email security. He has been an amateur radio operator since 1953, and now devotes most of his time to the GNU Radio project. He is a member of the GNU Radio General Assembly, the GRCon21 Organizing Committee, and is currently the Documentation Lead for GNURadio.