Problems with uXRCE-DDS middleware

KasperMollerHansen · February 10, 2025, 10:26am

Hi
Im not very experienced with PX4, but im trying to follow the guide: ROS 2 User Guide | PX4 Guide (main)

Ros2 and PX4-Autopilot gets installed just fine, but im unable to install the Micro XRCE-DDS Agent from source or in a ROS2-WS. I’ve tried installing it with snap, but then I encounter an error with the connection between the client and the agent:

WARN [health_and_arming_checks] Preflight Fail: No connection to the ground control station
INFO [uxrce_dds_client] synchronized with time offset 1739179377942282us
ERROR [uxrce_dds_client] create entities failed: rt/fmu/in/register_ext_component_request 128 128 132
ERROR [uxrce_dds_client] create entities failed: rt/fmu/in/unregister_ext_component 128 128 132

Any suggestions?

Kasper

KasperMollerHansen · February 10, 2025, 2:12pm

github.com/KasperMollerHansen/PX4ROS2

README.md

main

# PX4ROS2



```
cd
git clone https://github.com/PX4/PX4-Autopilot.git --recursive
bash ./PX4-Autopilot/Tools/setup/ubuntu.sh
cd PX4-Autopilot/
make px4_sitl
```

```
sudo apt update && sudo apt install locales
sudo locale-gen en_US en_US.UTF-8
sudo update-locale LC_ALL=en_US.UTF-8 LANG=en_US.UTF-8
export LANG=en_US.UTF-8
sudo apt install software-properties-common
sudo add-apt-repository universe
sudo apt update && sudo apt install curl -y

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This made me able to obtain the same results as the guide

rroche · February 10, 2025, 3:54pm

If you are following the docs you should be able to install and run, are instructions from our docs failing?

KasperMollerHansen · February 11, 2025, 10:10am

python3 -m pip install --upgrade pip
python3 -m pip install --upgrade setuptools wheel twine check-wheel-contents

These two lines helped a lot! They should go into the docs

Kind Regards
Kasper