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When I wrote the RFLEX driver, I tested it with the joystick teleop and navigation stacks. I had not really considered the effects of sending just one message.

When the driver recieves the Twist message, it stores the velocities and sends them to the hardware continuously. The effect I would expect from running that command is for the robot to turn in a circle indefinitely. I don't know why it stops.

The B21 Home message is leftover debug information (sorry about that) for when it hits its 'home' orientation.

I wrote the driver awhile ago. If this is not the standard behavior for working with cmd_vel commands, I can fix it. Or better yet, you can submit a patch :)