Rosserial Hydro unpack requires string length 4
Hi,I installed rosserial hydro for arduino and ros_lib as written in the wiki. when I try ros hello world example found in ros_lib it compiles and works fine but when i try a ros_lib example with a subscriber, whatever topic name is, i get (from pubsub ros example):
[INFO] [WallTime: 1380287883.995053] ROS Serial Python Node [INFO] [WallTime: 1380287884.001497] Connecting to /dev/ttyACM0 at 57600 baud [INFO] [WallTime: 1380287886.607383] Note: publish buffer size is 512 bytes [INFO] [WallTime: 1380287886.607882] Setup publisher on chatter [std_msgs/String] [ERROR] [WallTime: 1380287886.609524] Creation of subscriber failed: unpack requires a string argument of length 4.
So publisher is created but subscriber fails....! I use hydro on ubuntu 12.04 64bit.Is there a way to solve it?I'm stuck here...!Someone can help me? thank!