Direct UDP traffic to a specific Machine Instance?

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I’m deploying game servers for a large game project on Fly, which use UDP.

It works for 1 machine on 1 app, but if I scale up the number of machines, how do I specify which machine the user is connecting to?

What I would like to do is this:

  1. User queues up by contacting a central server
  2. The central server finds an existing Machine or spins up a new one if needed
  3. User connects to that specific Machine ID over UDP

The only things I’ve seen for routing are related to HTTP it seems.

How can I route to a specific machine via UDP?