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ROS2 Services: stuck on spin_until_future_complete

I have a client node that is sending a request to a server node. I followed the same format as in the ros2 demos repository:

https://github.com/ros2/demos/blob/master/demo_nodes_cpp/src/services/add_two_ints_client.cpp

It is getting stuck at the rclcpp::spin_until_future_complete(node, result). I am confused what is causing the problem because I checked that the request is correct