function PP2Receive(packetwait)
		mastID, PP2Packet = rednet.receive("PP2", packetwait)
		sep = "%s"
        t = {}
		i = 1
		for str in string.gmatch(PP2Packet, "([^"..sep.."]+)") do
                t[i] = str
                i = i + 1
        end
		pp2S = #t
		t[1] = tonumber(t[1])
		t[2] = tonumber(t[2])

		if pp2S == 3 then
			return t[1], t[2], t[3]
		end
		outputMessage = ""
		counter = 3
		while counter <= pp2S do
			outputMessage = outputMessage .. t[counter] .. " "
			counter = counter + 1
		end
		return t[1], t[2], outputMessage
end

while true do
	local message = ""
	i1, i2, message = PP2Receive()
	if message == "track" then
		rs.setOutput(left, false)
		message = ""
		i1, i2, message = PP2Receive()
		if message == "track" then
			rs.setOutput(left, true)
		end
	end
end