Hello, I'm looking for port an application from zeromq to nanomsg. Most of the missing/different functionality I can figure out how to implement, but one thing isn't clear: How can I get ZMQ_ROUTER like functionality with nanomsg? Specifically, I need to explicitly send messages to a specific connection of the socket. The docs say "use L4 protocols" for that, but I'm not sure what solution this is suggesting (there is an old thread about this, but no solutions there either). My architecture is a (multi-threaded) server which needs to route requests to specific workers, because workers host different sets of data (so workers are not interchangeable). These requests are synchronous REQ/REP. I could do this by adding the address as a header to my payload, and implementing a router myself, but this would require a separate socket for each worker. This seems less than ideal since there are many server threads and workers, so this would be a lot of sockets and connections (each server thread would need a socket for each worker). Since nanomsg supports many connections per socket, it seems strange to have to do this. Is there, or could there be, an option in the auxiliary data to specify which connection to route the message to, or some other better solution? Another, perhaps related, issue, is that I need an asynchronous REQ/REP-like connection between clients and the server, for high throughput. It seems that raw nanomsg sockets make it possible to do such things, but how to go about it isn't clear to me. Thanks, -- dr