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How to use it with speedtest-cli: search for the node you need, remember the Server ID and execute the following command:
curl -LO https://raw.githubusercontent.com/sivel/speedtest-cli/master/speedtest.py chmod +x speedtest.py python speedtest.py --server SERVER_ID
Update Sep 2020: With the recent update of SpeedTest.net API, I can no longer get the full list of all testing nodes. It only returns 100 nodes nearest to your request geolocation. This proof of concept will not receive active updates until I find a solution.