[ROS2] call service :"waiting for service to become available"

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Hi,

I'm using the std_srvs/srv/Trigger service:

 rclcpp::Client<std_srvs::srv::Trigger>::SharedPtr init = node->create_client<std_srvs::srv::Trigger>("/init");

 auto trig = std::make_shared<std_srvs::srv::Trigger::Request>();
 auto trig_result = init->async_send_request(trig);

if (rclcpp::spin_until_future_complete(node, trig_result) ==
                    rclcpp::executor::FutureReturnCode::SUCCESS)
                {
                    RCLCPP_INFO(node->get_logger(),"Init motor succesfull.");
                    rclcpp::sleep_for(sec);
                    state++;
                    break;
                }

First I check if the service is live:

 ros2 service list

I can find the /init service so I want to call it like in following tutorial : https://index.ros.org/doc/ros2/Tutori...

ros2 service call /init std_srvs/srv/Trigger

The only response I get is:

> waiting for service to become available ...

What am I doing wrong calling or creating this service ?

Thanks