I wrote some scripts for Easytether to get working from glinet GUI shows up as usb99 at sets up multiwan settings
ssh into glinet router after installing easytether-usb-tiny_0.8.9-5_openwrt-19.07.3
and run
openssl genpkey -algorithm rsa -pkeyopt rsa_keygen_bits:2048 -out /etc/easytether/adbkey 2> /dev/null
chown root:root /etc/easytether/adbkey
chmod 0600 /etc/easytether/adbkey
rm -f /etc/hotplug.d/usb/80-easytether-boot
cat <<'EOF' >> /etc/hotplug.d/usb/80-easytether-boot
#!/bin/sh
if [ ! -f "/tmp/easytether-up" ]; then
touch /tmp/easytether-up
sleep 30
/usr/bin/easytether-usb -t usb99
fi
EOF
chmod +x /etc/hotplug.d/usb/80-easytether-boot
rm -f /etc/hotplug.d/usb/99-easytether-usb
cat <<'EOF' >> /etc/hotplug.d/usb/99-easytether-usb
#!/bin/sh
[ "$ACTION" = "add" ] || exit 0
[ "$INTERFACE" = "255/66/1" ] && {
killall -9 easytether-usb
/usr/bin/easytether-usb -t usb99 -n "/sys$DEVPATH"
}
EOF
chmod +x /etc/hotplug.d/usb/99-easytether-usb
uci set mwan3.tethering.track_method='httping'
uci commit mwan3
/etc/init.d/mwan3 reload
uci set kmwan.tethering.track_mode='passive'
uci commit kmwan
/etc/init.d/kmwan reload
please try and let me know I also can built a .ipk that does this automatic without having to ssh into router