https://openwrt.org/docs/guide-developer/start
https://openwrt.org/docs/user-guide/imagebuilder
https://openwrt.org/docs/guide-developer/quickstart-build-images
https://openwrt.org/docs/guide-developer/use-buildsystem
https://openwrt.org/docs/user-guide/extroot_configuration
https://github.com/nxhack/openwrt-node-packages
https://github.com/nxhack/openwrt-node-packages/issues/15
https://codepad.co/snippet/hh8FztUc
https://wiki.openwrt.org/toh/linksys/wrt_ac_series (WRT3200 firmware is 75 Mb, WRT1900ACS v2 is 34 MB)
https://github.com/kaloz/mwlwifi
https://github.com/chrisber/openwrt-ipkg-redis
https://github.com/patrikx3/openwrt-redis
https://forum.lede-project.org/t/how-to-build-openwrt-packages/885/6
https://forum.lede-project.org/t/how-to-build-openwrt-packages/885/7