Hi, thanks for your messages. I'm not pursuing this further, though. People in #zeromq IRC advised strongly against using libraries based on version 2 of libzmq (for example, the Akka ZeroMQ library) due to a number issues in that version. In fact, https://github.com/zeromq/jeromq seems the way to go for ZeroMQ use in Java/Scala, as it seems...
Thanks Tobias
