Hi Mauri! afaik nRepl is a request/multi-response protocol, with nothing for server sent events, so maybe a new op for polling events is your only option?

or maybe a long polling system is a little bit more efficient, but I guess that depends on clients and servers timeouts handling

what I would try is to add a middleware with a subscribe-to-events op that will send multiple responses but never send one with a :status :done . As events occur you keep sending back responses. On the client side call subscribe-to-events once after the client connects and dispatch all events client side for every response returned