while true do

x,y,z = commands.getBlockPosition()

local i = -1
local e = 1
local o = 2
rednet.open("bottom")

event, id, choix, = os.pullEvent()
if event == "rednet_message" then
if choix == "Dock" then
mat = "wool"
rednet.broadcast("request")
print("Docking granted")
elseif choix == "Undock" then
mat = "air"
rednet.broadcast("quit")
print("Undocked work please wait...")
end

while o ~= 15 do

while i ~= 2 do
if (choix == "Dock") and (i = 0) then
commands.async.setBlock("~"..(i), "~", "~"..(-o), "minecraft:"..mat)
else
commands.async.setBlock("~"..(i), "~", "~"..(-o), "minecraft:"..mat)
i = i+1
sleep(0.1)
end
end
i = 1
sleep(0.1)

while i ~= 4 do
if (choix == "Dock") and (i = 2) then
commands.async.setBlock("~"..(i), "~", "~"..(-o), "minecraft:"..mat)
else
commands.async.setBlock("~2", "~"..(i), "~"..(-o), "minecraft:"..mat)
i = i+1
sleep(0.1)
end
end
i = 1
sleep(0.1)

while i ~= -2 do
if (choix == "Dock") and (i = 0) then
commands.async.setBlock("~"..(i), "~", "~"..(-o), "minecraft:"..mat)
else
commands.async.setBlock("~"..(i), "~4", "~"..(-o), "minecraft:"..mat)
i = i-1
sleep(0.1)
end
end
i = 3
sleep(0.1)

while i ~= 0 do
if (choix == "Dock") and (i = 2) then
commands.async.setBlock("~"..(i), "~", "~"..(-o), "minecraft:"..mat)
else
commands.async.setBlock("~-2", "~"..(i), "~"..(-o), "minecraft:"..mat)
i = i -1
sleep(0.1)
end
end
i = -1
sleep(0.1)
o = o+1
end
end
end