Rostopic weird behaviour an Raspberry

edit

Hellow,

I installed the robot variant on my raspberry Pi. For this I had to get rid of two packages : ros_lisp and collada_urdf. Anyway...

My pi is having a very weird behaviour when publishing on some topic.

Let's say I'm publishing a Twist on the cmd_vel topic like this :

rostopic pub -r 1 cmd_vel geometry_msgs/Twist '{linear: {x: 1.0, y: 0.0, z: 0.0}, angular: {x: 0.0, y: 0.0, z: 0.0}}'

If I use

rostopic echo cmd_vel

I'm going to be able to see what is publish ONLY if I start publish before subscribing. If I publish a new message it is not "printed" "detected" until I stop rostopic echo and start it again.

This behaviour is global to any subscribe publish since I tried it with another node and I have the same problem.

I have no clue as from where does this problem comes from. If someone got any idea...

EDIT :

after reading this thread I must say that I started a roscore in a terminal by itself so I'm not restarting it.

EDIT 2 :

It might be relevant to say that I'm accessing the Pi through the Yaler Interface with ssh. But I'm accessing the Pi so, if I'm not mistaken, everything run on the Pi (I installed ROS through Yaler).

Thanks a lot !