startup

rednet.open( "back" )
local h = fs.open("log","w")
while true do
  redstone.setOutput("left",true)
  redstone.setOutput("right",false)
  tEvent = { os.pullEvent() }
  if tEvent[1] == "rednet_message" then
    if tEvent[2] == 6529 then
      if tEvent[3] ~= "GravityCube" and tEvent[3] ~= "102112915" then
        h.writeLine(tEvent[3])
        h.flush()
      end
    end
  end
end