UDP hello world on https://github.com/bettio/atomvm (works on d6c6d54d607e5d8ca5af7447fa53f3d4e1647db4)

UDPHelloWorld.ex

defmodule UDPHelloWorld do

  @remote_ip {192, 168, 0, 2}
  @port 8981

  # @ssid 'YourSSID'
  # @psk 'YourPassword'

  def start() do
    # You should connect to a network and sleep some seconds
    # network = :network.open()
    # :network.setup(network, [{:ssid, @ssid}, {:psk, @psk}])
    # :timer.sleep(1000)
    
    udp = :erlang.open_port({:spawn, "udp"}, [])
    send_udp(udp, @remote_ip, @port, 'UDP hello world\n')
  end

  def send_udp(udp, ip_addr, dest_port, buffer) when is_list(buffer) do
    send udp, {self(), make_ref(), :send, ip_addr, dest_port, buffer}
    receive do
      ret -> ret
    end
  end
end