rosserial arduino ackermann_msgs subscriber problem

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Hello, i'm studying rosserial and arduino!

I want to build nodes that one node in ros(ros node) publish ackermann_msgs, and the other node in arduino(arduino node) subscribes it.

But, it's not work!

I think the subscriber callback function isn't triggered.

But when i check the rqt_graph, it shows they communicate well.

So how would i solve this problem?

Check list

1. rosserial_python work well with arduino
2. publisher(the ros node) publish topic properly. ( I also double checked it by echoing topic and implementing subscriber (in ros node) )
3. All executed nodes didn't show any error message.
4. rqt_graph shows they