test chat w/ coroutines FIRST TIME IVE USED THEM!

function ping()
  rednet.open("back")
  rednet.broadcast("PINGchat","kdchat")
end

function pong()
  rednet.open("back")
  senderId, message, protocol = rednet.receive()
  if message == "PINGchat" then
    rednet.send(senderId,"PONGchat",protocol)
    setupChat()
  else
    pong()
  end
end
function setupChat()
  if term.isColor() then
    term.setBackgroundColor(colors.white)
    term.setTextColor(colors.black)
    return "color"
  else
    return "no color"
  end
end
function writingChat()
  while true do
    msg = io.read()
    if msg == "/exit" then
      error("User exited program!")
    else
      print(user..": "..msg)
      rednet.send(senderId,msg,protocol)
    end
  end
end
function receivingChat()
  while true do
    rednet.receive(protocol)
  end
end
function coroutineController()
  chatIn = coroutine.create(receivingChat())
  coroutine.resume(chatIn)
end
ping()
pong()
ping()
coroutineController()
writingChat()