libzmq3-dev - 4.3.4-1+deb11u1 main

ØMQ is a library which extends the standard socket interfaces with features
traditionally provided by specialised messaging middleware products.
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ØMQ sockets provide an abstraction of asynchronous message queues, multiple
messaging patterns, message filtering (subscriptions), seamless access to
multiple transport protocols and more.
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This package contains the ZeroMQ development libraries and header files.