Reset Gazebo with initial joint positions and velocities (#241) (#244)

(cherry picked from commit c5b0b90)

Co-authored-by: Ruddick Lawrence <[email protected]>

gz_ros2_control/src/gz_system.cpp

@@ -32,6 +32,7 @@
 #include <gz/sim/components/JointPositionReset.hh>
 #include <gz/sim/components/JointVelocity.hh>
 #include <gz/sim/components/JointVelocityCmd.hh>
+#include <gz/sim/components/JointVelocityReset.hh>
 #include <gz/sim/components/LinearAcceleration.hh>
 #include <gz/sim/components/Name.hh>
 #include <gz/sim/components/ParentEntity.hh>
@@ -48,8 +49,10 @@
 #include <ignition/gazebo/components/JointForce.hh>
 #include <ignition/gazebo/components/JointForceCmd.hh>
 #include <ignition/gazebo/components/JointPosition.hh>
+#include <ignition/gazebo/components/JointPositionReset.hh>
 #include <ignition/gazebo/components/JointVelocity.hh>
 #include <ignition/gazebo/components/JointVelocityCmd.hh>
+#include <ignition/gazebo/components/JointVelocityReset.hh>
 #include <ignition/gazebo/components/LinearAcceleration.hh>
 #include <ignition/gazebo/components/Name.hh>
 #include <ignition/gazebo/components/ParentEntity.hh>
@@ -397,9 +400,15 @@ bool GazeboSimSystem::initSim(
       // independently of existence of command interface set initial value if defined
       if (!std::isnan(initial_position)) {
         this->dataPtr->joints_[j].joint_position = initial_position;
+        this->dataPtr->ecm->CreateComponent(
+          this->dataPtr->joints_[j].sim_joint,
+          sim::components::JointPositionReset({initial_position}));
       }
       if (!std::isnan(initial_velocity)) {
         this->dataPtr->joints_[j].joint_velocity = initial_velocity;
+        this->dataPtr->ecm->CreateComponent(
+          this->dataPtr->joints_[j].sim_joint,
+          sim::components::JointVelocityReset({initial_velocity}));
       }
     }