client.nim

import asyncio, sockets

var disp = newDispatcher()

proc clientConnect(s: PAsyncSocket, arg: PObject) {.nimcall.} =
  echo("Connected")
  s.send("Hello")

proc connect(host: string, port: TPort) =
  var client = AsyncSocket(typ = SOCK_DGRAM, protocol = IPPROTO_UDP)
  client.handleConnect = clientConnect
  disp.register(client)
  client.connect(host, port)

connect("localhost", 2048.TPort)

while true:
  if not disp.poll():
    "Breaking :(".echo
    break

server.nim

import
  asyncio, sockets, times,
  sg_assets
type
  TServer = object
var
  disp = newDispatcher()

proc serverRead(s: PAsyncSocket, arg: PObject) {.nimcall.} =
  var line = ""
  discard s.recvLine(line)
  if line == "":
    echo("<<nil")
  else:
    echo("<<", line)
  echo(repr(s), repr(arg))
  
proc serverAccept(s: PAsyncSocket, arg: PObject) {.nimcall.} =
  echo("Accepted new client")
  var client: PAsyncSocket
  new(client)
  s.accept(client)
  client.handleRead = serverRead
  disp.register(client)

proc createServer(port: TPort, buffered = true) =
  var server = AsyncSocket(typ = SOCK_DGRAM, protocol = IPPROTO_UDP)
  server.handleAccept = serverAccept
  disp.register(server)
  server.bindAddr(port)
  #server.listen()
  echo(repr(server))

createServer(2048.TPort)
echo("Listening...")

while true:
  if not disp.poll():
    break