fix recovery after prolonged MQTT outages #55

Job	Run time
test	17s
build-binary (arm64, aarch64-unknown-linux-gnu)	1m 3s
build-binary (amd64, x86_64-unknown-linux-gnu)	56s
build-docker (linux/amd64, amd64)	25s
build-docker (linux/arm64, arm64)	25s
merge	15s
	3m 21s

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