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Old 10-24-2014, 02:51 PM   #1
pratsam
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Registered: Jul 2009
Posts: 13

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how to test remote loop back in Bluetooth using hci commands


I have small in-house device running on linux platform with bluez libraries.

I have created a sco connection with Jaber Easygo device and everything works as expected. I mean I can play music on my linux machine using aplay and I can successfully hear on jabber. similarly I can record voice from jabber to linux machine using arecord.

Now I want to do testing using remote loopback, so that I send packets from Jabber to Linux machine and receive same packet back into Jabber.

After trying and spending days I couldn't able to crack it, so I am requesting you guys to please give some advice.

Below are the following things I tried.

1) Load kernel module snd-bt-sco 2) Ran btsco -v -r

o/p : successfully created the link and can play or record music . so far so good

Now for remote testing

i) open a terminal and type

Code:
hcitool cmd 0x06 0x002 0x02
o/p : sometimes
Quote:
HCI Event : 0xff plen 7 CD 03 00 44 00 00 00
ii) In another terminal I use hcidump

Quote:
hcidump -X sco -w test_remote_loop_log
iii) In another terminal I record so that packest goes from jabber to Linux box

Quote:
arecord -B 1000000 _D plughw:Headset /home/my_place/test_remote_loop_1.wav
then I speak something on Jabber and close the above recording

iv) Using Wireshark and filter type "bthci_sco" all I have noticed is Rcvd SCO DATA has data in it ( which is obviously expected) example
Quote:
0000 03 31 00 30 bf ff bb ff e4 etc
But Sent SCO DATA has no data in it example

Quote:
0000 03 31 00 30 00 00 00 00 00 ..till end
Can some please guide me what I am doing wrong

Thanks a lot

Last edited by pratsam; 10-25-2014 at 04:50 AM.
 
  


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