DDS error: ddsi_udp_conn_write failed
DDS sending on wrong interface; fix by prioritizing the robot link in CycloneDDS.
ddsi_udp_conn_write failed indicates DDS is trying to send ROS2 traffic out the wrong network interface (e.g., Wi‑Fi instead of the Ethernet link to the robot).
Fix: edit cyclone_dds.xml to explicitly prioritize the interface that connects to the robot.
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