add context managerless ros example

Author: beverlylytle

docs/examples/03_backends_ros/01_ros_examples.rst

@@ -24,10 +24,20 @@ see the output ``Connected: True`` if everything is working properly:
 
     from compas_fab.backends import RosClient
     with RosClient() as client:
-        print('Connected:', client.is_connected)
+        print('Connected: ', client.is_connected)
 
 *Yay! Our first connection to ROS!*
 
+If you prefer to work without a context manager, the equivalent code is:
+
+.. code-block:: python
+
+   from compas_fab.backends import RosClient
+   client = RosClient()
+   client.run()
+   print('Connected: ', client.is_connected)
+   client.close()
+
 .. note::
 
     ``RosClient`` also supports using *callbacks* instead of blocking calls.

src/compas_fab/backends/ros/client.py

@@ -145,7 +145,6 @@ def __init__(self, host='localhost', port=9090, is_secure=False, planner_backend
 
     def __enter__(self):
         self.run()
-        self.connect()
 
         return self