Bastion Reciever Secondary

local function bastion()
    local modem = peripheral.find("modem") or error("No modem attached", 0)
    modem.open(15) -- Open 43 so we can receive replies

    -- And wait for a reply
    local event, side, channel, replyChannel, message, distance
    repeat
      event, side, channel, replyChannel, message, distance = os.pullEvent("modem_message")
    until channel == 15

    -- Process the received message based on its content
    if message == "Bridge" then
        os.sleep(1)
        if redstone.getInput("left") then
            modem.transmit(43, 15, "Closing Bridge Gate")
        else
            modem.transmit(43, 15, "Opening Bridge Gate")
        end

    elseif message == "Courtyard" then
        os.sleep(1)
        if redstone.getInput("right") then
            modem.transmit(43, 15, "Closing Courtyard Gate")
        else
            modem.transmit(43, 15, "Opening Courtyard Gate")
        end

    elseif message == "status" then
        courtyard = ""
        bridge = ""
        lockdown = ""
        if redstone.getInput("right") then
            courtyard = "Courtyard Gate Closed, "
        else
            courtyard = "Courtyard Gate Open, "
        end
        if redstone.getInput("left") then
            bridge = "Bridge Gate Closed, "
        else
            bridge = "Bridge Gate Open, "
        end
        if redstone.getInput("back") then
            lockdown = "Lockdown Enabled"
        else
            lockdown = "Lockdown Disabled"
        end
        modem.transmit(43, 15, courtyard .. bridge .. lockdown)


    elseif message == "Lockdown" then
        os.sleep(1)
        if redstone.getInput("back") then
            modem.transmit(43, 15, "Enabeling Lockdown")
        else
            modem.transmit(43, 15, "Disabeling Lockdown")
        end
    end
end

term.clear()
term.setCursorPos(1, 1)
print("Bastion Online!")

-- Main loop
while true do
    bastion()
end