Flow control (#1296) #688

Job	Run time
tests (ubuntu-latest, tests)	36s
build (ubuntu-latest, noradio)	1m 52s
tests (macos-latest, tests)	28s
build (ubuntu-latest, wifi)	2m 12s
tests (windows-latest, tests_nosan)	1m 25s
build (ubuntu-latest, bt)	2m 19s
build (macos-latest, noradio)	1m 35s
build (macos-latest, wifi)	1m 46s
build (macos-latest, bt)	1m 42s
build (windows-latest, noradio)	4m 34s
build (windows-latest, wifi)	6m 20s
build (windows-latest, bt)	5m 20s
	30m 9s

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