CLIENT:
#include <czmq.h>

int main (void)
{
    zsock_t *pub, *sub;
    pub = zsock_new_pub(">tcp://localhost:5555");
    zmsg_t *send = zmsg_new();
    zframe_t *f1, *f2;
    f1 = zframe_new("/test/test2",strlen("/test/test2"));
    f2 = zframe_new("Hello, world",strlen("Hello, world"));
    zmsg_append(send,&f1);
    zmsg_append(send,&f2);
    zmsg_send(&send,pub);
    sub = zsock_new_sub(">tcp://localhost:5556", "/test/test2");
    sleep(1);
    zmsg_t *msg = zmsg_recv(sub);
    zmsg_print(msg);
    zmsg_destroy(&msg);
    zsock_destroy(&pub);
    zsock_destroy(&sub);
    return 0;
}

SERVER:
#include <czmq.h>

int main (void)
{
    zactor_t *proxy = zactor_new(zproxy, NULL);
    zstr_send (proxy, "VERBOSE");
    zsock_wait (proxy);
    zstr_sendx(proxy, "FRONTEND", "XSUB", "tcp://*:5555", NULL);
    zsock_wait(proxy);
    zstr_sendx(proxy, "BACKEND", "XPUB", "tcp://*:5556", NULL);
    zsock_wait(proxy);
    zsock_t *capture = zsock_new_pull ("inproc://capture");
    zstr_sendx (proxy, "CAPTURE", "inproc://capture", NULL);
    zsock_wait (proxy);

    while (true) {
        zmsg_t *msg = zmsg_recv(capture);
        if (!msg)
            break;
        printf("C: ");
        zmsg_print(msg);
    }
    zsock_destroy(&capture);
    zactor_destroy(&proxy);
}