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2016-05-05 00:19:29 -0500	asked a question	How does rosmsg md5 calculate the md5sum? Hello! I need to communicate through ros topics between two different ros versions. One of the msgs depends on trajectory_msgs which has changed between versions so it gives a md5sum error. To overcome this I tried to add the old version of trajectory_msgs to my catkin workspace and recompile. The output of rosmsg shows that after I source my workspace, the msg changes but the md5 does not, any ideas? $~/indigo_ws$ rosmsg show trajectory_msgs/JointTrajectoryPoint float64[] positions float64[] velocities float64[] accelerations float64[] effort duration time_from_start $~/indigo_ws$ rosmsg md5 trajectory_msgs/JointTrajectoryPoint f3cd1e1c4d320c79d6985c904ae5dcd3 $~/indigo_ws$ source devel/setup.bash $~/indigo_ws$ rosmsg md5 trajectory_msgs/JointTrajectoryPoint f3cd1e1c4d320c79d6985c904ae5dcd3 $~/indigo_ws$ rosmsg show trajectory_msgs/JointTrajectoryPoint float64[] positions float64[] velocities float64[] accelerations duration time_from_start $~/indigo_ws$ rosmsg md5 trajectory_msgs/JointTrajectoryPoint f3cd1e1c4d320c79d6985c904ae5dcd3
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