title: Adding delay to robot controller in webots
body: <p>I'm doing a pick and place task using UR3 in webots.
  I need the robot to go to Pick position, grasp the object (close its fingers), and go to Place position. Something like following code:</p>
  <pre><code>  while (wb_robot_step(TIME_STEP) != -1) {
     // 1. Go to Pick position
     for (i = 0; i &lt; 6; ++i)
       wb_motor_set_position(ur_motors[i], pick_position[i]);                  
  
     // 2. Grasp the object
     for (i = 0; i &lt; 2; ++i)
        wb_motor_set_position(finger_motors[i], 0.5);
          
     // 3. Go to Place position
     for (i = 0; i &lt; 6; ++i)
       wb_motor_set_position(ur_motors[i], place_position[i]);                     
  } 
  </code></pre>
  <p>However, when I run the code, I see that while robot is going to Pick position, fingers also get closed. I read in documentations that &quot;the wb_motor_set_position function stores the new position, but it does not immediately actuate the motor&quot;. So I want to know how I can add a delay between step 1 and 2, i.e., fingers get closed only after motor actuation reached the desired position. I used sleep but didn't help.</p>