[zeromq-dev] max PUB/SUB topics

Bekritsky, Benjamin Benjamin.Bekritsky at zebra.com
Mon May 13 19:06:41 CEST 2019


I am using libzmq and setting up topics using binary data. In other words, my topic is the first 2 bytes of my message.

I subscribe by setting a and b to the values I'm interested in:
        for (uint16_t i = a; i <= b; i++)
        {
                d = zmq_setsockopt(sub_socket, ZMQ_SUBSCRIBE, &i, 2);
                if (d)
                {
                        printf ("E: subscription failed: %s\n", strerror (errno));
                        return -1;
                }
        }

My publisher publishes like this:
                string incoming_string = " this message";
                incoming_string.insert(0,1,i>>8);
                incoming_string.insert(0,1,i%256);

                int     rc = zmq_send(pub_socket, incoming_string.c_str(), incoming_string.size(), 0);

I can't seem to subscribe to more than 1000 topics (values 0x0000 - 0x03e7). From what I understand, thousands of topics should be available.

Any guidance would be helpful.

Thanks,
Benjy

Benjamin Bekritsky
c/o Zebra Technologies
2 Negev St. (Motorola Building)
4th Floor
Airport City 7019900
Israel



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