Direct PNG URL: /kindle/dashboard.png?battery=85
Run on Kindle via SSH / KUAL:
curl -s "http://<server-ip>:8080/kindle/dashboard.png?battery=$(lipc-get-prop -i com.lab126.powerd battLevel)" -o /tmp/dashboard.png /mnt/us/libkh/bin/fbink -c -g /tmp/dashboard.png