On Monday, October 16, 2023 4:12:41 PM CEST XU Yang wrote:

Dear maintainer,

I am a developer currently using the batman-adv library in research and have encountered some issues that I hope you might be able to assist with.

In setting up a mesh network using batman-adv, I've noticed that when only two nodes are present in the network, they are unable to communicate with each other. However, once a third node is introduced, all nodes can communicate normally. Further testing has revealed that even with two nodes, despite good ad-hoc wifi connection quality, the nodes remain invisible to each other.

Here are the system and configuration details:

Hardware: Jetson Orin NX with rtl8822ce Operating System: L4T r35.3.1 Ubuntu20.04 batman-adv version: 2023.2-9-g5fecd4a3

The configuration code we use is in the attachment.

I appreciate your time in reading this email and look forward to your response. I hope you might be able to help me understand the cause of this issue and suggest possible methods to resolve it.

Hi Young Xu,

this sounds like a underlying Wi-Fi driver issue. You may want to set up IP addresses on the base Wi-Fi interfaces (e.g. wlan0) and try to ping between the nodes directly, without batman-adv. You may also check further with "iw wlan0 station dump" (or similar) who receives packets by whom, or check with tcpdump if you see the OGM broadcasts.

I haven't seen many Realtek Wi-Fi devices to use batman-adv, and at least in the past my experience with those devices not very positive, so also for that reason I'd look into driver related issues first.

Cheers, Simon