When DNS fails, mqtt (and other things) can cause reboots

[mich181189]

When DNS is down, the resulting connection failures can cause the watchdog timer to be triggered. This is bad because it means the cache is lost

[mich181189]

When dns fails once things are running, the node will work for a while before potentially getting stuck in a reboot loop.

What’s nasty is this can happen even if there is a cached card, because of the revalidation