This is a simple Python script to test the network speed based on speedtest-cli. It records the current date, time and the ping, download and upload speed in a speedtest_log.csv file in the same directory. In case that the speedtest_log.csv doesn't exist it will be created otherwise it will just append the results to the end of the file, adding new rows.
You can also define the server using the --server option to the speedtest-cli command. You can get a list of all available servers sorted by their distance to you by executing:
$ speedtest-cli --list > speedtest_servers.txt
From this list you can select your own server and add its ID in the cmd:
speedtest-cli --server ID --simple
where ID is the numerical ID of the selected server. This will force speedtest-cli to use every time this server.
In order to run it continuously you can add an entry to the crontab and the interval at each to make the poll like:
*/10 * * * * python3 /home/<username>/<path_to_the_script>/network_test.py
This means that the script will run every 10 minutes.