For inspiration have a look at these
- QoSmate traffic shaping https://github.com/hudra0/qosmate
- banIP malicious host blocking https://github.com/openwrt/packages/blob/master/net/banip/files/README.md
- lldpd port info - luci-app-lldpd https://github.com/openwrt/luci/pull/6456
- router monitoring - luci-app-statistics collectd-mod-sensors collectd-mod-thermal collectd-mod-ping collectd-mod-sqm collectd-mod-irq
- traffic monitoring - luci-app-nlbwmon
- statistics export to Grafana - prometheus-node-exporter-ucode / nlbw2collectd https://github.com/mstojek/nlbw2collectd
- RPi bootloader update - bcm2711-eeprom
- Owut Owut: OpenWrt Upgrade Tool