Reception - ComputerCraft

local function Pulse()
  redstone.setOutput("back", not redstone.getOutput("back"))
end

local function Pulse2()
    redstone.setOutput("right", not redstone.getOutput("right"))
end

function bool_to_number(value)
  return value and 1 or 0
end

local modem = peripheral.find("modem")
local event, side, channel, replyChannel, message, distance

modem.open(43)

while true do
    event, side, channel, replyChannel, message, distance = os.pullEvent("modem_message")
    if message == "swap" then
        Pulse()
        modem.transmit(replyChannel, 43, redstone.getOutput("back"))
    end
    if message == "stop" then
        Pulse2()
        modem.transmit(replyChannel, 43, bool_to_number(redstone.getOutput("right")) + 2)
    end
    print(message)
end