zmq publisher can't use parallelly, because tcp port is fixed as below.

If you try to use zmq publishers in parallel, you will get an error on the second and subsequent publishers.

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

This problem makes me inconvenient when debugging multi-robots for example, RoboCup Soccer SSL.

Are there any plans to expand it to allow flexible port specification?