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I am not sure how different the communication protocols between the roomba 780 and the roomba 530 are. You could try the following launch file to bring up the robot's base driver:

<launch>
  <node name="turtlebot_node" type="turtlebot_node.py" pkg="turtlebot_node">
    <rosparam>
      port: /dev/ttyUSB0
      publish_tf: True
      robot_type: roomba
      has_gyro: False
    </rosparam>
  </node>
</launch>

Make sure that the usb port is correct. If launching the file does not throw an error, rostopic echo /odom should publish data and you should be able to teleop the robot. If you are getting errors, I guess the communication protocol changed. In that case you might have to patch the turtlebot driver. Patches welcome :)