Add wait_for_next_message so CT002 serves fresh powermeter data #630

Job	Run time
lint	15s
validate (3.11)	40s
validate (3.13)	39s
validate (3.10)	41s
validate (3.12)	36s
build-addon (linux/amd64, addon-linux-amd64) / build	29s
build (linux/arm/v7, base-linux-arm-v7) / build	38s
build-addon (linux/arm64, addon-linux-arm64) / build	55s
build (linux/amd64, base-linux-amd64) / build	33s
build (linux/arm64, base-linux-arm64) / build	57s
merge-addon / merge	40s
merge / merge	40s
	7m 43s

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