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Things I generally check and try in such case:

1. Use "Bridged mode" for the Network Interface in VirtualBox
2. Check that your VM and the RPI are on the same network
3. Check that both machines are on the same ROS_DOMAIN_ID
4. Machines can ping each others

(Note: However since I've change my modem I can no more discover topics on other machine reliably. Seems the DDS discovery fails with my new modem, with CycloneDDS and ros2 Humble, and VirtualBox. I've not find a fix yet)

Things I generally check and try in such case:

1. Use "Bridged mode" for the Network Interface in VirtualBox
2. Check that your VM and the RPI are on the same network
3. Check that both machines are on the same ROS_DOMAIN_ID
4. Machines can ping each others

(Note: However since

Things I generally check and try in such case:

1. Use "Bridged mode" for the Network Interface in VirtualBox
2. Check that your VM and the RPI are on the same network
3. Check that both machines are on the same ROS_DOMAIN_ID
4. Machines can ping each others
5. (Since I've change my modem I can no more discover topics on other machine reliably. Seems the DDS discovery fails with my new modem, with CycloneDDS and ros2 Humble, and VirtualBox. I've not find a fix yet. Maybe try with other internet box/modem boxes/modem/routers ?)