Marcel Holtmann schrieb:

Hi Stefan,

Are you sure that both of your listining servers are set for switching
the role to master after connection? Remember that the connecting device
is master in the first place.

Yes, I'm aware of that, but I don't know if this is a problem. It looks 
like this at the client:


your firmware is HCI 16.4 which is good, but you are going to create a
scatternet on your client and that can be the problem. Looks like this
is an internal problem of the CSR firmware.

You mean the dongles try to create a scatternet (with packet routing and so on) on their own? I always thought a scatternet has to be implemented outside the hard-/firmware. Is there a way to upgrade it? Are there better dongles the University could buy?

Try to introduce some delays
between the connections and see if that helps.

I'm experimenting with delays and timeouts for three days now. It helps... a bit, but not really good. I just tried to switch master-slave, but it doesn't really help.
One year ago, I wrote another Location Awareness App on top of a modified JBlueZ and it just used ACL links to measure RSSI and LQ. It worked. I probably have to take care of the ACLs myself (does L2CAP use existing ACLs?). The only drawback: The App has to run as root :(. Thanks for your help.

Regards
Stefan