-- Code for Recieving PCs

function listen()
local modem = peripheral.wrap("right")
modem.open(3)
local event, modemSide, senderChannel,
  replyChannel, message, senderDistance = os.pullEvent("modem_message")
  modem.close(3)
  CheckMessage(message)
end

function box1()
print("Box 1")
redstone.setOutput("back", true)
os.sleep(99)
redstone.setOutput("back", false)
listen()
end

function box2()
print("Box 2")
redstone.setOutput("back", true)
os.sleep(99)
redstone.setOutput("back", false)
listen()
end

function box3()
print("Box 3")
redstone.setOutput("back", true)
os.sleep(99)
redstone.setOutput("back", false)
listen()
end

function CheckMessage(message1)
	if message1 == 1
	then
	print("ok1")
	box1()
	elseif message1 == 2
	then
	print("ok2")
	 box2()
	elseif message == 3
	then
	print("ok3")
	 box3()
	else
	end
end

--program

listen()