Add wait_for_next_message so CT002 serves fresh powermeter data (#322) #635

Job	Run time
lint	16s
validate (3.10)	35s
validate (3.13)	37s
validate (3.11)	40s
validate (3.12)	34s
build (linux/amd64, base-linux-amd64) / build	45s
build (linux/arm/v7, base-linux-arm-v7) / build	35s
build-addon (linux/arm64, addon-linux-arm64) / build	34s
build (linux/arm64, base-linux-arm64) / build	54s
build-addon (linux/amd64, addon-linux-amd64) / build	46s
merge-addon / merge	17s
merge / merge	15s
	6m 48s

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