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The secs and nsecs fields of a timestamp are integer values, so secs: 0.7 is getting truncated to zero.

To represent 0.7s, you can either do time_from_start = rospy.Duration.from_sec(0.7), or explicitly set the fields to secs = 0 and nsecs = 700000000

More here http://wiki.ros.org/rospy/Overview/Time

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