-- Master of the automatic bringing system
-- Works with a simple protocol:

-- Master: broadcast -item-
-- matching slave: send -ack- or -empty-
-- in case of a -ack- the master will wait for -return-
-- in case of -empty- the master will exit

-- if there is no matching slave, then the master won't receive ack and exits
-- if there are more matching slaves, then there is UB


local args = { ... }

-- the wifi side, i guess...
rednet.open("right");

-- aks for the item
rednet.broadcast(args[1])

-- get ack
local id, message = rednet.receive(3)
if message == "ack" then
	print("He is coming, please wait")
	local id2 = nil

	-- ignore other messages from others sources...
	while (id ~= id2) or (message ~= "return")  do
		id2, message = rednet.receive()
	end

	print("He returned safely :)")
elseif message == "empty" then
	print("There is no " .. args[1])
else
	print("No slave responded for " .. args[1])
end