Hi,
After some failure last year to us BATMAN-ADV on picostation plugged in a mobile robot. I have re flashed last week the last open-wrt with the last stable batman-adv (2006.0). I still have some problem making a single hop fast. I have 3 nodes A B C, I put the robot (nodeB) very close to node C and A is fare from B and C. B is still connecting directly to A. sometime If I wait for a very long time the route became A - C - B , what I exactly want. I have this behavior since 2010 and on each version I test on picostation.
To resume, when the robot along 2 nodes and it takes a very long time before he got a new route to increase his range.
don't know what your definition of 'fast' is but did you play with the originator interval ? Check our doc: https://www.open-mesh.org/projects/batman-adv/wiki/Tweaking#originator-inter...
The default settings are tailored for wireless community networks with rather static setups.
I understand but I could be wrong, that the metric calculation in BATMAN-IV is not good for mobile application because of some radio that keeps the link until the last minute before beginning to increase their packet errors ?
That assessment is not entirely correct. If you can live with the overhead of faster originator intervals (read: increasing the protocol exchange rate) you can run batman inside cars driving around.
This problem is unrelated to the metric.
BATMAN-V seems to be more promising because of the new metric calculation based on link throughput we get from the driver, and also because we can override the data throughput value to force a route (we are imagining using GPS for that).
I don't see how you would force a route with BATMAN IV or BATMAN V. The latter allows specifying a speed over an interface, not per neighbor. This interface speed applies to everything routed over that interface.
The reason why these overrides are missing is simple: It defeats the purpose of an automatic protocol. If you want static routes there is no need for batman.
Furthermore, meshing based on location / proximity with the help of GPS or coordinates only works as long as you don't have any obstacles anywhere. Meaning: Not in real world setups.
I really want to test BATMAN-V, I tried to switch to BATMAN-V but it was not on the available routing algorithm list. Do I need to compile a devel version on open-wrt ?
Yes, you would need to compile the devel version hosted on git.open-mesh.org (https://git.open-mesh.org/openwrt-feed-batman-adv.git) or wait for the next stable release. Feedback is welcome!
Cheers, Marek