namespace problem when launch multiple s1.launch

[zhuhaier1992]

Hi Jerome, I have been learning and using ROS2 recently, and this repo is really helpful. It allows multiple control of robomaster, combined with ROS2 which makes coding much easier, thanks a lot! When I use it to control three S1, the namespace become strange. I simply set each serial number and their respective name to RM4, RM5, RM6. But the namespace become:

/RM4
/RM4/RM5
/RM4/RM5/RM6

Which is strange, because when I do the same thing to three EP, the namespace is normal:

/RM1
/RM2
/RM3