Hi I had the same problem as you and actually have the same DUT as me.
Here is what I did...
Pair your Linux PC with phone.
Install cu from the repositories.
Open terminal window and type...
Code:
hciconfig restart
hciconfig reset
sdptool add --channel=2 SP
rfcomm listen rfcomm2 2
You should see something like...
Code:
Waiting for connection on channel 2
On the phone do Options > BT console > Select the PC you are connecting to
Then you'll see...
Code:
Connection from 00:19:B7:4B:DF:9E to /dev/rfcomm2
Press CTRL-C for hangup
Open a second terminal window and type...
Hit return and when you see >>> type...
Code:
import appuifw
appuifw.note(u"This works", "info")
Sweet!