hi, the objective is to create a shaft(assume) in rviz, rotate it, and i can get the rotation on my arduino. i know the answer lies with rosserial_arduino servo example, and that with rviz example, but i just cant figure it out. can anybody tell me how i can do it (or maybe a simple step by step procedure for how can i do coding for it?)? i'm on ubuntu 14, ros indigo.