Re: [Bluez-devel] Reading RSSI of non-connected devices

[Andreas Faerber <afaerber@rumms.uni-mannheim.de>]

Hi Marcel, Hi Arpit,

I've made some progress on our periodic scan test code. I didn't find 
the example you referenced but I have managed to initiate a periodic 
scan, to read some events and to stop the scan. Some things I noticed 
however, for instance that when I ran my app twice a little time-shifted 
the second process didn't get any events once the first process was 
finished. Can I avoid this somehow? Currently I am catching the 
EVT_CMD_COMPLETE event for OCF_EXIT_PERIODIC_INQUIRY and restarting the 
search, but as I am not getting an event for the start of the periodic 
inquiry that I could process it would seem that if I do e.g. a 3 second 
period inquiry and during my scan afterwards someone else does e.g. a 30 
second period inquiry then it will change this on a global level so that 
I do not get my results as expected?

Regarding the multitude of events, how do I distinguish between the 
inquiry_info_with_rssi and inquiry_info_with_rssi_and_pscan_mode 
structs? They appear to be using the same event but would be 
incompatible due to the "inserted" pscan_mode member. Currently I am 
testing with an HCI 1.1 device and getting only the inquiry_info struct. 
Which of the other inquiry+RSSI events map to which HCI version? Is 
inquiry_info_with_rssi HCI 1.2 and extended_inquiry_info HCI 2.0? Or do 
these responses depend on anything else?

Oh, and is it not possible to send HCI commands as a non-root user? We 
were getting EPERM from hci_send_cmd and had to setup a Linux box solely 
for this purpose so that I could be root - admins wouldn't allow that on 
the other University machines, and I'm concerned whether our potential 
users would all be able to run our software as root...

Best regards,

Andreas


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