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Have you made sure the accelerations
and efforts
fields are actually populated?
Note in the documentation for trajectory_msgs/JointTrajectoryPoint:
# Each trajectory point specifies either positions[, velocities[, accelerations]] # or positions[, effort] for the trajectory to be executed.
The []
in [, velocities[, accelerations]]
and [, effort]
indicate that these are optional. Not all implementations may populate those fields.