Ça marche pas trop mais au moins ça permet de ce passer de speedtest. :)

Command

echo "Please wait, speedtest running..."; echo "Download: "$(iperf3 -c neodarz.net -p 5203 -t 10 -R -P 10 -O 3 | grep "SUM" | grep "receiver" | awk '{ print $6" "$7}'); echo "Upload: "$(iperf3 -c neodarz.net -p 5203 -t 10 -P 10 -O 3 | grep "SUM" | grep "receiver" | awk '{ print $6" "$7}')

Output:

Please wait, speedtest running...
Download: 9.25 Mbits/sec
Upload: 3.09 Mbits/sec