Turtle

rednet.open("left")
  local i = 1
  repeat
    local sEvent, param = os.pullEvent("key")
    if sEvent == "key" then
      if param == 17 then
        rednet.send(5,"forwards")
        print("Sending go forwards message!")
        p0,message = rednet.receive(1)
        if p0 == nil then
          print("Message not received.")
          end
        if message == "forwards" then
          print("Message was received.")
          end
        end
      if param == 30 then
        rednet.send(5,"left")
        print("Sending turn left message!")
        p0,message = rednet.receive(1)
        if p0 == nil then
          print("Message not received.")
          end
        if message == "left" then
          print("Message was received.")
          end
        end
      if param == 32 then
        rednet.send(5,"right")
        print("Sending turn right message!")
        p0,message = rednet.receive(1)
        if p0 == nil then
          print("Message not received.")
          end
        if message == "right" then
          print("Message was received.")
          end
      if param == 31 then
        rednet.send(5,"back")
        print("Sending go backwards message!")
        p0,message = rednet.receive(1)
        if p0 == nil then
          print("Message not received.")
          end
        if message ==  "back" then
          print("Message was received.")
          end
        end
       if param == 16 then
         print("Exiting Turtle controlling mode.")
         i=i+1
       end
      end
        sleep(.2)
       end
     until i == 2