I use the Argonone v2 housing on the Raspberry Pi 4 with Alpine Linux. It is necessary to send a signal to the housing before the shutdown is completed so that it switches off the power supply with a time delay. This signal must not be sent during a reboot. With Gentoo Linux, in the event of a reboot, the environment variable RC_Reboot is set to yes. Could this also be implemented in the busybox please? Alternatively, you could implement a separate action reboot in the inittab