startup.lua

local modem = peripheral.wrap("right")
modem.open(42)

while true do

    local _, _, _, _, payload, distance = os.pullEvent("modem_message")


    if payload ~= nil then

       if payload.target == "service_door_1" and distance <= 5 then
           redstone.setOutput("top", true)
           os.sleep(3)
           redstone.setOutput("top", false)
       end
    end

end