ros2 communication_error ai_generated partial

[micro-ROS Agent] No connection from micro-ROS client

ID: ros2/micro-ros-agent-connection-failed

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70%Fix Rate
82%Confidence
3Evidence
2023-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
2 active — — —

Root Cause

micro-ROS agent cannot connect to the embedded MCU client. Serial/UDP transport misconfiguration.

generic

Workarounds

  1. 90% success Verify serial port and baud rate match between agent and firmware 
    ros2 run micro_ros_agent micro_ros_agent serial --dev /dev/ttyUSB0 -b 115200
  2. 85% success Check that the MCU firmware was built with the correct RMW and transport 
    colcon build --packages-select micro_ros_setup --cmake-args -DRMW_UXRCE_TRANSPORT=serial
  3. 82% success Use minicom/screen to verify the serial port is alive before starting agent 
    screen /dev/ttyUSB0 115200  # should see micro-ROS handshake bytes

Dead Ends

Common approaches that don't work:

  1. Increase agent timeout to minutes 78% fail

    If the MCU is not running the micro-ROS client, no timeout will help

  2. Flash firmware without matching the agent transport 88% fail

    Serial agent needs serial firmware config; UDP agent needs WiFi/Ethernet firmware