local pocketID = 1085 --# ID of the pocket computer
rednet.open("side")

while true do --# Run this code forever
  local senderID , message = rednet.recieve() --# Waits for a message

  if senderID == pocketID then --# Makes sure the sender was the pocket computer (This is easy to fake though)
    if message == "REDSTONE" then

      --# Do the thing you need to

    end
  end
end