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WARNING: no messages received and simulated time is active. Is /clock being published?

i wrote a c++ node that publish std_msgs::Float64 to a topic where my gazebo is connected.

so the connection is done, but i have a problem cause gazebo didn't receive the message sent.

i'm trying : rostopic echo /pkg_robot/joint1_position_controller/command

to message published, and i have this warning :

WARNING: no messages received and simulated time is active. Is /clock being published?

if you could help i would be so thankful.