I tried both options…
Both give parse errors…
Collected errors:
* opkg_conf_parse_file: /etc/opkg/customfeeds.conf:4: Ignoring invalid line: `https://install.speedtest.net/app/cli/ookla-speedtest-1.1.1-linux-armel.tgz'
* opkg_install_cmd: Cannot install package https://install.speedtest.net/app/cli/ookla-speedtest-1.1.1-linux-armhf.tgz.