Last night had a power outage, one of my ESXi hosts was rebooted.
Need to fix that.
But another issue was that an connectivity to the MQTT server was lost for a few minutes. MQTT server was not down, just disconnected. But it was enough to cause me trouble. All of my Arduino MQTT connections went down.
So I need to come up with a fix AND a way to test it.
It also could be that it was an older library.
Gonna test on some ESP8266s first.