LbrRobix's profile - activity

I playing alot with :::ROS and I realize this:

I can modify my Python app and start it again by doing:

$rosrun mypkg mypython.py

no need to go back to catkin workspace and do catkin_make

but if I do that (catkin_make) everything works too...

then what is the sense behind the catkin_make command

How can I see the type of parameter I can pass to when I set a Rosparam?

I do

$rosparam list

and got:

/background_r

/background_g

/background_b

etc

those are intuitive enough to predict that are ints

but if i need the type by doing

$rosparam type /background_r

I got an error since that command is not existing...

on the other hand, doing:

$rosparam set /background_r "foo"

fails silently...

what am doing wrong?

Am learning :::ROS from here: http://wiki.ros.org/ROS/Tutorials/Wri...

but is not 100% clear to me what is this in the package.xml file

find_package(catkin REQUIRED COMPONENTS roscpp rospy std_msgs genmsg)

I need to do REQUIRED and COMPONENTS, but hold on, is not a roscpp required too? what belowns to REQUIRED and what to COMPONENTS ???

Thanks!