Zeromq in ROS as external library

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Hi all,

I am trying to use zeromq in ros as external library to communicate with other device(no ros on this device).

For testing i wrote a rosnode with zeromq reciever and zeromq sender with zeromq sample code and ran both on my pc .

i am using port tcp://10.64.7.220:9000

If i start rosnode first, zeromq sender not able to connect with and exits with below error.

terminate called after throwing an instance of 'zmq::error_t'
  what():  Address already in use
Aborted (core dumped)

If i start zeromq sender first, rosnode not able to connect with and exits with error at

zmq_bind (responder, "tcp://10.64.7.220:9000");

I went through ros networking little but i couldn't figure it out why its not working.

thank you.