Feature request: persist config / calibration

[jpettitt]

It seems like the config / calibration is persisted in mqtt messages, the issue is those go away if I reboot Mosquitto. I'd like them to be persisted someplace where they survive a hard reboot for the server. I've mitigated it a little by moving the MQTT server out of HA into it's own container on proxmox which at least means I don't lose the config on every HA operating system update ...

[DTTerastar]

Make sure you're not setup to ignore the retain option. Retain should save it in mqtt and survive reboots.