Minimal UDP server example

[jac241]

Hello, thank you for all your hard work building out the Async ecosystem for Ruby.

I am looking to set up a minimal UDP server example for myself to try out this gem. Code is as follows:

require "async"
require "io/endpoint/host_endpoint"

endpoint = IO::Endpoint.udp("localhost", 5678)

Async do |task|
  endpoint.bind do |socket|
    while true
      data, _ = socket.recvfrom(1024)
      puts data
    end
  end
end

client = IO::Endpoint.udp("localhost", 5678)

Async do |task|
  client.connect do |socket|
    10.times do 
      socket.send("Hello")
    end
  end
end

When I run this ruby in a file, nothing gets printed and the program hangs.

Likely, I have a misunderstanding of the Async programing model, and I'm doing something obvious that causes this. I tried to copy the udp echo server example from the archived async-io repository relatively faithfully (though not doing an echo of course). In an ideal world, I'd love to build a pure Ruby pub-sub and clustering library so that we wouldn't need to depend on Redis or a DB to back the pub-sub required for ActionCable. If I was ever maimed and couldn't do my day job I'd probably work on this.

Thank you for your time.