Node-bebop library


Hi all,
I am currently trying to use node-bebop library from github node-bebop to control bebop 1 using program coded in python. I want to know if anyone has any background in working with this library because I am facing some problems understanding the functionality of the commands coded in this library, for example the command "up(val), Cause the drone to increase in altitude at 0-100 speed ", I don’t know what is the unit of speed to control the bebop speed, and also sometimes the drone takesoff and then doesn’t land.

Any ideas?