This tool subscribes to the
/run/mpa/vvpx4_sys_status pipe published by voxl-vision-px4 which provides a copy of all SYS_STATUS mavlink messages received from a PX4 flight controller. Among other things, this packet contains battery status information which can be viewed here.
Also note that voxl-portal subscribes to the same pipe and also shows battery percentage in the top right corner of the webpage.
yocto:/$ voxl-inspect-battery Voltage | Charge | Current | 12.22V | 89% | 0.49A |
If no data is displayed, then either voxl-vision-px4 is not running or PX4 is not connected or operating.
Source code available on Gitlab.