I use some xbee (s2) modules with zb stack for mesh networking evaluation. Therefore a multi hopping environment has to be created. The problem is, that the firmware handles the association for themselves and there is no way deeper into the stack as the api provides. To force the path of the data, without to disturb the routing mechanism, I have tried to measure, I had to put them outside their reach. To get only the next hop in association isn't that easy. I used the least power level of the output, but the distance for the test setup is to large and the rf characteristics of the environment change undetermined.
Therefore my question, has anyone experience with this issue?
Regards, Toby
I don't think it's possible through software and coordinator/routers. You could change the Node Join Time (ATNJ) to force a new router to join through a particular router (disable Node Join on all nodes except one), but that would only affect joining. Once joined to the network, the router will discover that other nodes are within range.
You could possibly do it with sleepy end devices. You can use the ATNJ trick to force an end device to join through a single router, and it will always send its messages to that router. But you won't get that many hops -- end device sends to its parent router, which sends to the target's parent router, which sends to the target end device.
You'll likely need to physically limit the range of the radios to force hopping, as demonstrated in the video you linked of Digi's K-Node test equipment with a network of over 1000 radios. They're putting the radios in RF-shielded boxes and using wired antenna connections with software-controlled attenuators to connect the modules to each other.
If you have XBee modules with the U.fl or RPSMA connector, and don't connect an antenna, it should significantly reduce the range of the module. Otherwise, with a wire whip or integrated PCB antenna, you need to put each radio in some sort of box that attenuates the signal. Perhaps someone else can offer advice on materials that will reduce the signal's range without completely blocking it.