treeFarmTurtle

local modem = peripheral.wrap("right") -- Wraps modem peripheral.
modem.open(1) -- Opens and listens to channel 1 (modem).

while true do
  local event, modemSide, senderChannel = os.pullEvent("modem_message") -- pulls event "modem_message"
  if event == "modem_message" and senderChannel == 1 then -- If event is "modem_message" and channel 1 place block.
    turtle.place()
  end
end