Is there any command or some way to check from busybox if the network cable is connected or disconnected.

So far I have tried python's psutil package but it seems that psutil is not installed on the busybox system:

import psutil

psutil.sensors_battery().power_plugged

Busybox version:

busybox | head -1
    
BusyBox v1.31.1 () multi-call binary.