Question about power tables or other transmit power limit

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Hi all,

we are looking into limiting transmit power for our bluetooth file server project. The idea is to limit sending radius so that people don't feel harassed if they do not want to receive files.

First we tried to read the RSSI during device discovery and base our decision on that. But the readings varied too much because of power saving methods like power tables.

Since we cannot update the firmware of the mobile phones, we decided to try to limit the transmit power for our device discovery HCI device. After reading about things a bit and browsing through the docs that CSR provides, we tried to cap the maximum power or to change the power tables with the bccmd. Unfortunately, the dongle doesn't seem to accept the change. After setting the value and re-reading it, the change is gone:

[root@horst Desktop]# bccmd psget 0x0017
Maximum transmit power: 0x0004 (4)
[root@horst Desktop]# bccmd psset 0x0017 0
[root@horst Desktop]# bccmd psget 0x0017
Maximum transmit power: 0x0004 (4)

I also tried dump all PS keys and restoring the modified dump - same issue.

Does anybody have experience with this? Do we need special BT dongles? We are also inquiring with CSR at the moment, but using a windows software is not an option, as our project is using embedded Linux (of course :).

Looking forward to any help.

Best regards,

Florian.
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