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How to fix joints from plugin (C++)

Hi all!

I have a big robot with a lot of joints. I want to write prog for autotuning PID parameters for each joint.

To do it I need to consequently fix all joints except one from C++ plugin.

How can I fix (stop) my joints using API? I use gazebo8.

I try to do it in such way but it has no affect:

for(int i=1;i<model->GetJointCount();++i)
joint[i] =_model->GetJoints()[i];
gazebo::physics::Entity::EntityType type_fixed = gazebo::physics::Entity::FIXED_JOINT;