František Kučera <franta-hg@frantovo.cz> [Sun, 20 Dec 2020 01:00:15 +0100] rev 7
send the second message as a response (instead of after a fixed delay)
František Kučera <franta-hg@frantovo.cz> [Sat, 19 Dec 2020 23:59:39 +0100] rev 6
verify the response from the mixer