The DEALER to ROUTER Combination
Now we can switch out both REQ and REP with DEALER and ROUTER to get the most powerful socket combination, which is DEALER talking to ROUTER. It gives us asynchronous clients talking to asynchronous servers, where both sides have full control over the message formats.
Because both DEALER and ROUTER can work with arbitrary message formats, if you hope to use these safely, you have to become a little bit of a protocol designer. At the very least, you must decide whether you wish to emulate the REQ/REP reply envelope. (It depends on whether you actually need to send replies or not.)
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