Nim UDP server discovery

client.nim

import net

let socket = newSocket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)
socket.setSockOpt(OptReuseAddr, true)
socket.setSockOpt(OptReusePort, true)
socket.setSockOpt(OptBroadcast, true)
socket.sendTo("255.255.255.255", Port(12346), $0b10)

var
  receivedFrom = ""
  receivedPort = Port(0)
  line = ""
  len = socket.recvFrom(line, 16, receivedFrom, receivedPort)
echo "Discovered server at: " & receivedFrom

server.nim

import net

var discoverServer = newSocket(protocol = IPPROTO_UDP, sockType = SOCK_DGRAM)

discoverServer.setSockOpt(OptReuseAddr, true)
discoverServer.setSockOpt(OptReusePort, true)
discoverServer.setSockOpt(OptBroadcast, true)
discoverServer.bindAddr(Port(12346))

while true:
  var
    receivedFrom = ""
    receivedPort = Port(0)
    line = ""
    len = discoverServer.recvFrom(line, 1, receivedFrom, receivedPort)
  if line == $0b10:
    discoverServer.sendTo(receivedFrom, receivedPort, $getPrimaryIPAddr(parseIpAddress(receivedFrom)))