Queuing and keeping messages while broker unavailable

[EkimEvgeny]

Does any setting exist that allows zigbee2mqtt to keep messages while MQTT broker unavailable and send them when connection restored?
I need it for a project, where the internet can be unstable, and need to keep all sensor measurements anyway.
If no - can I add this feature to zigbee2mqtt?

[Koenkk]

You can set retain: true for those device, e.g. https://www.zigbee2mqtt.io/information/configuration.html#example

http://www.steves-internet-guide.com/mqtt-retained-messages-example/