more communication

bring

@@ -2,5 +2,24 @@ 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
+	printf("There is no " .. args[1])
+else
+	print("No slave responded for " .. args[1])
+end

slave

@@ -5,15 +5,18 @@ while true do
 	-- we are using wireless to get the distance
 	-- so the master should be aligned with the slaves
 	local id, mess, dist = rednet.receive()
-	if mess == id then
+	if mess == args[1] then
+		rednet.send(id, "ack")
 		turtle.up()
 		for i = 1, dist do turtle.back() end
 
-		-- TODO: wait for empty chest or something
-		sleep(1)
+		print("I will leave again in 5 seconds...")
+		sleep(5)
+		print("Bye!")
 
 		for i = 1, dist do turtle.forward() end
 		turtle.down()
+		rednet.send(id, "return")
 	end
 end