Would it be possible to somehow run the payload automatically to avoid having to manually initiate the pppwn script through a web browser? This project: https://github.com/FalsePhilosopher/PPPwnWRT has the following commands to enable auto-start in OpenWRT
/etc/init.d/pppwnwrt enable
/etc/init.d/pppwnwrt start
top -d 1 | grep pppwn to ensure pppwn is running