while true do
modem="top"
sender_ok={11,12,13,30}
ok=false

function checketage()
for _, value in pairs(sender_ok) do
  rednet.send(value,"etage",true)
  sleep(0.2)
end
local id,message2,distance = rednet.receive(20)
print(message2)
return message2
end

function up(nb)
i=0
while i<nb do
i=i+1
rs.setOutput("back",true)
rs.setOutput("left",true)
sleep(0.5)
rs.setOutput("back",false)
rs.setOutput("left",false)
sleep(0.3)
end
end


function down(nb)
i=0
rs.setOutput("back",true)
sleep(0.3)
rs.setOutput("back",false)
while i<nb do
i=i+1
rs.setOutput("right",true)
sleep(0.5)
rs.setOutput("right",false)
sleep(0.3)
end
end