Hi everyone, I recently released a package called joy_tester, and with the latest sync it should now be available in the humble and rolling package repos (foxy should come whenever it is next synced).
It’s a simple utility for monitoring/troubleshooting Joy messages, since the values ROS sees are not always as expected (compared to normal OS joystick monitoring tools), and a simple topic echo does not at a glance show which button/axis is which (useful when mapping controls).
There’s certainly room for improvement (see the README), but it has one main job and it does it fine.
I hope someone out there finds it useful (as I have), and any feedback is welcome! 
P.S. If you do find it helpful, you may also like another package I maintain: twist_stamper, for simple conversion between Twist and TwistStamped topics.
