State::interface not created.

[olivier-stasse]

Dear @ahcorde,

I believe that
https://github.com/ros-simulation/gazebo_ros2_control/blob/79207cc7d7630a8aeced1b9f5bba985e0805e538/gazebo_ros2_control/src/gazebo_system.cpp#L171

should be

this->dataPtr->joint_pos_state_[j] = std::make_shared<hardware_interface::StateInterface>( joint_name, hardware_interface::HW_IF_POSITION, &this->dataPtr->joint_position_[j]);

The same goes for velocity and effort.

Do you agree or did I misunderstood ?

[ahcorde]

Nice catch! #53