Use forward slash as it is default way of defining ros2 topic

examples/python-ros2-dataflow/random_turtle.py

@@ -21,14 +21,12 @@ topic_qos = dora.experimental.ros2_bridge.Ros2QosPolicies(
 
 # Create a publisher to cmd_vel topic
 turtle_twist_topic = ros2_node.create_topic(
-    "/turtle1/cmd_vel", "geometry_msgs::Twist", topic_qos
+    "/turtle1/cmd_vel", "geometry_msgs/Twist", topic_qos
 )
 twist_writer = ros2_node.create_publisher(turtle_twist_topic)
 
 # Create a listener to pose topic
-turtle_pose_topic = ros2_node.create_topic(
-    "/turtle1/pose", "turtlesim::Pose", topic_qos
-)
+turtle_pose_topic = ros2_node.create_topic("/turtle1/pose", "turtlesim/Pose", topic_qos)
 pose_reader = ros2_node.create_subscription(turtle_pose_topic)
 
 # Create a dora node

libraries/extensions/ros2-bridge/python/src/lib.rs

@@ -101,7 +101,7 @@ impl Ros2Node {
         message_type: String,
         qos: qos::Ros2QosPolicies,
     ) -> eyre::Result<Ros2Topic> {
-        let (namespace_name, message_name) = message_type.split_once("::").with_context(|| {
+        let (namespace_name, message_name) = message_type.split_once("/").with_context(|| {
             format!(
                 "message type must be of form `package::type`, is `{}`",
                 message_type