This is an old revision of the document!
http://www.mikrotik.com/testdocs/ros/2.9/tools/btest.php
View status:
/tool bandwidth-server print /tool bandwidth-server session print
To enable bandwidth-test server without client authentication:
/tool bandwidth-server set enabled=yes authenticate=no
An example to run a 15-second bandwidth-test:
/tool bandwidth-test 10.0.0.211 duration=15s direction=both size=1000 protocol=udp user=admin