Add support for creating and configuring proxies #8
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This PR adds support for setting up a proxy for forwarding messages from a back-end socket to a front-end socket. It enables a number of broker patterns, including XPub-XSub, Router-Router, Router-Dealer and others documented in the ZMQ guide.
The implementation basically sets up a
Proxy
object linking the two specified sockets. To help visually match the flow of data, proxies are always specified from front-end to back-end, using theProxyFrontend
andProxyBackend
operators, respectively.