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dd5eec35be
Lets the application set per-connection metadata. Metadata is specified as "X-key:value" and set using zmq_setsockopt, eg: zmq_setsockopt (s, ZMQ_METADATA, "X-key:value", 11); The peer can then obtain the metadata from a received message: char *data = zmq_msg_gets(msg, "X-key");