rednet.open("top")
x, y, z = gps.locate(2, false)

function send(x1, y1, z1, message)
	return rednet.broadcast(x1.. ":(@!#!):" ..y1.. ":(@!#!):" ..z1.. ":(@!#!):" ..message)
end

function receive( nTimeout )
	local timer = nil
	if nTimeout then
		timer = os.startTimer( nTimeout )
	end
	while true do
		local e, p1, p2, p3 = os.pullEvent()
		if e == "rednet_message" then
			local tWords = {}
			for match in string.gmatch(p3, "[^:(@!#!):\t]+") do
				table.insert( tWords, match )
			end

			if(not tWords[4] == nil)then
				if(tWords[1] == x and tWords[2] == y and tWords[3] == z)then
					return tWords[1], tWords[2], tWords[3], tWords[4]
				end
			end
		elseif e == "timer" and p1 == timer then
			return nil, nil, nil
		end
	end
end