So https://github.com/richb-hanover/OpenWrtScripts is a more recent iteration of the same scripts. And guidosarducci created a speedtest package for openwrt partly based on betterspeedtest.sh, see [Speedtest: new package to measure network performance](Speedtest: new package to measure network performance, and https://github.com/openwrt/packages/blob/master/net/speedtest-netperf/files/README.md)
https://www.bufferbloat.net/projects/bloat/wiki/Tests_for_Bufferbloat/ has some more pointers.