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2012-01-27 00:30:53 -0500	commented answer	rosserial_arduino can't send a sensor_msgs/Imu msg In the serialize code for header they use strlen that don't check for NULL strings. My bad. Anyway, as said, using a not null string doesn't change anything.
2012-01-27 00:19:09 -0500	commented answer	rosserial_arduino can't send a sensor_msgs/Imu msg 0 means an empty string as well, and yes, I just initialized the quaternion value to 0. Anyway, I've try setting a non-empty string as frame_id and a valid quaternion value and I get the same results. Thanks anyway!
2012-01-26 23:11:11 -0500	asked a question	rosserial_arduino can't send a sensor_msgs/Imu msg Hi, I have a imu implemented with arduino that I'd like to connect to ros but I got stuck in the most simple thing, sending the Imu message. Sometimes it's it just hang sometimes I get an exception in the python client. This is the program I'm trying: `#include <ros.h> #include <sensor_msgs/Imu.h> ros::NodeHandle nh; sensor_msgs::Imu imu_msg; ros::Publisher imu_pub("imu", &imu_msg); void setup() { nh.initNode(); nh.advertise(imu_pub); imu_msg.header.frame_id = 0; imu_msg.orientation.x = 0.0; imu_msg.orientation.y = 0.0; imu_msg.orientation.z = 0.0; imu_msg.orientation.w = 0.0; } void loop() { imu_msg.header.stamp = nh.now(); imu_pub.publish( &imu_msg ); nh.spinOnce(); delay(1000); }` And this output of the python serial_node: [INFO] [WallTime: 1327668877.112084] ROS Serial Python Node [INFO] [WallTime: 1327668877.115963] Connected on /dev/ttyACM0 at 57600 baud [INFO] [WallTime: 1327668880.075914] Note: publish buffer size is 512 bytes [INFO] [WallTime: 1327668880.076318] Setup publisher on imu [sensor_msgs/Imu] Traceback (most recent call last): File "/home/dlobato/ros_workspace/rosserial/rosserial_python/nodes/serial_node.py", line 58, in <module> client.run() File "/home/dlobato/ros_workspace/rosserial/rosserial_python/src/rosserial_python/SerialClient.py", line 284, in run self.callbacks[topic_id](msg) File "/home/dlobato/ros_workspace/rosserial/rosserial_python/src/rosserial_python/SerialClient.py", line 95, in handlePacket m.deserialize(data) File "/opt/ros/electric/stacks/common_msgs/sensor_msgs/src/sensor_msgs/msg/_Imu.py", line 190, in deserialize raise roslib.message.DeserializationError(e) #most likely buffer underfill roslib.message.DeserializationError: unpack requires a string argument of length 72 If I just change the type of message it works fine, so I think either there's some kind of bug regarding the Imu message or I can't see the problem. Any idea is welcome! Thanks! David.