I recently used ROUTER and DEALER sockets, which used multi-part messages to separate identity of sender and the message data.
I personally, found this approach quite sophisticated. But then, I found some use for the PUB and SUB socket pair. I was surprised to see the examples in the guide not using multi-part messages. Instead they used concatenation to append the "TOPIC" to the main message and then filter out based on that. Is there a specific reason for doing concatenation, instead of using the first part of a multi-part message? Regards, Dev
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