--sys2_service_doors_tDoor3x3
args = { ... }
local rootId = tonumber(args[1])
local bootUnitId = tonumber(args[2])

os.loadAPI("sys/syslib")

function imp(side)
    redstone.setOutput(side, false)
    redstone.setOutput(side, true)
    sleep(0.1)
    redstone.setOutput(side, false)
    sleep(0.15)
end

function chain(sides)
    for i, side in ipairs(sides) do
        imp(side)
    end
end

function open()
    chain({"left", "bottom", "top", "right", "top", "left" })
end

function close()
    chain({ "left", "bottom", "left" })
end

while true do
    local id, msg = syslib.receiveRednet()
    local tag, pts = syslib.getMsgData(msg)
    if tag == "@door" then
        if pts[1] == "open" then
            open()
        elseif pts[1] == "close" then
            close()
        else print("unknown command: " .. pts[1])
        end
    end
end