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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