Using two NodeMcu and one Wemos D1 with the same problem... The mqtt broker is on a b4j server and works fine. The micros are clients for the same topic which is a date and time string like this : "18 07 19 16 37 00 5" . After about 20 (+-2) received messages the clients report MQTT disconnect, try to reconnect but without success, and usually restarts. It does not matter if the rate is one message every 1.5 minute or 30 minutes. Looks like a buildup of used memory. Any idea how to clean it while still working to prevent the disconnection ? Thanks.