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2015-06-12 11:09:30 -0600 received badge  Enthusiast
2015-06-04 15:13:09 -0600 answered a question android custom messages - Subscriber handshake failed - Message types don't match

I think the key take away here, which paulbovbel might have been hinting at, is that the _TYPE field in your Java message interface needs to match the type listed in your published topic.

In your example the Interface's _TYPE field listed: "custom_msgs/vehicle_model_dynamics";

but the topic actually published messages of type: ros_messages/vehicle_model_dynamics

It is not necessarily the name of the JAR.