teleop_twist_joy doesn't publish

edit

On Ubuntu I have installed the package ros-indigo-teleop-twist-joy in order to convert my joystick input (/joy) to velocity commands (/cmd_vel).

In order to test my setup I ran the provided launch file:

$ roslaunch `rospack find teleop_twist_joy`/launch/teleop.launch

which appears to run successful.

I can echo the output of /joy, which works as expected:

$ rostopic echo /joy
[...]
---
header: 
  seq: 1366
  stamp: 
    secs: 1473747626
    nsecs: 310893686
  frame_id: ''
axes: [0.0, -0.0, 0.0, 0.13615179061889648, 0.7007878422737122, 0.0, 0.0, 0.0]
buttons: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
---
header: 
  seq: 1367
  stamp: 
    secs: 1473747626
    nsecs: 314848332
  frame_id: ''
axes: [0.0, -0.0, 0.0, 0.06840069591999054, 0.7346633672714233, 0.0, 0.0, 0.0]
buttons: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
---
header: 
  seq: 1368
  stamp: 
    secs: 1473747626
    nsecs: 318864098
  frame_id: ''
axes: [0.0, -0.0, 0.0, 0.0006060103769414127, 0.8137062788009644, 0.0, 0.0, 0.0]
buttons: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
---
header: 
  seq: 1369
  stamp: 
    secs: 1473747626
    nsecs: 322849686
  frame_id: ''
axes: [0.0, -0.0, 0.0, -0.0, 0.8475818634033203, 0.0, 0.0, 0.0]
buttons: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
---
header: 
  seq: 1370
  stamp: 
    secs: 1473747626
    nsecs: 326847977
  frame_id: ''
axes: [0.0, -0.0, 0.0, -0.0, 0.9040411114692688, 0.0, 0.0, 0.0]
buttons: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
---
header: 
  seq: 1371
  stamp: 
    secs: 1473747626
    nsecs: 330820131
  frame_id: ''
axes: [0.0, -0.0, 0.0, -0.0, 0.9830840229988098, 0.0, 0.0, 0.0]
buttons: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
---
header: 
  seq: 1372
  stamp: 
    secs: 1473747626
    nsecs: 334849495
  frame_id: ''
axes: [0.0, -0.0, 0.0, -0.0, 1.0, 0.0, 0.0, 0.0]
buttons: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
---
[...]

I can echo the output on /cmd_vel which produces the following ouput everytime I issue the command (and nothing but silence thereafter).

$ rostopic echo /cmd_vel
linear: 
  x: 0.0
  y: 0.0
  z: 0.0
angular: 
  x: 0.0
  y: 0.0
  z: 0.0
---

Looking at the package's default configuration, I would expect to see an effect when I turn the left stick of my gamepad (Logitech F710). Triggering any of the sticks and axes apparantly doesn't change anything.

roswtf and rqt_console are empty. Using rqt_graph I can see that everything is set up correctly (the joy_node is connected to the teleop_twist_node via /joy and the teleop_twist_node is connected to the running echo process via /cmd_vel).

What am I doing wrong?