c++ - ZMQ Publish/Subscribe pattern publisher connects to subscribers -

i new zmq , did tutorials publish subscribe pattern. application don't quite apply. have 2 types of applications. application 1 can create connections multiple "applications two"s on network , send them data.

i tried implementing publish/subscribe pattern, instead of subscriber connecting publisher publisher connects subscribers.

publisher:

zmq::context_t context(1); zmq::socket_t socket(context, zmq_pub);  socket.connect("tcp://localhost:5555");  std::string text = "hello world"; zmq::message_t message(text.size()); memcpy(message.data(), text.c_str(), text.size());  socket.send(message); 

subscriber:

zmq::context_t context(1); zmq::socket_t socket(context, zmq_sub);  socket.bind("tcp://*:5555"); const char* filter = "hello "; socket.setsockopt(zmq_subscribe, filter, strlen(filter));  zmq::message_t request; socket.recv(&request);  std::string message = std::string(static_cast<char*>(request.data()), request.size());  std::cout << "message received!" << std::endl; std::cout << message << std::endl; 

the publisher finnishes without error, subscriber stuck in recv(). , yes starting them in right order (subscriber first)

i found solution myself: problem is, publisher send message, before subscriber ready receive. simple

zmq_sleep(1)  

before

socket.send(message);  

did job.