[maemo-developers] [maemo-developers] btcond / d-bus problems

[From: Andrew Ramsay]

I've been trying to connect a Nokia LD-1W Bluetooth GPS unit to an N770 
programmatically. The manual method on the wiki (hcitool scan + rfcomm 
bind <dev> <bda>) works fine, but I haven't been able to get anywhere with 
the btcond D-BUS interface linked from the wiki page. I've got no real 
experience of using D-BUS, which may well be part of the problem, but I've 
tried lots of different things now and none of them are working.

I started off with the basic example program which just connects to the 
session bus, lists the services available, then exits. That works fine 
with both session and system buses. I then tried to modify it slightly to 
obtain a proxy for the "com.nokia.btcond" service, which didn't work until 
I discovered you had to connect to the system rather than the session bus. 
Once I'd got the proxy, I tried to call the rfcomm_bind method as 
suggested in the wiki. However, all I get back is an error saying that 
this method doesn't exist on the com.nokia.btcond.request interface. 
Calling any of the other methods results in the error 
"com.nokia.btcond.invalid_dev", which is supposed to indicate an invalid 
BDA from what I can tell, although the address I'm using is definitely 
correct.

Can anyone help me out here? As I said, I have no previous experience with 
D-BUS programming, so I may well be doing something very wrong and just 
haven't noticed yet. I'm using the Glib bindings for D-BUS since that was 
what the example code used. If anyone has actually done this already I'd 
be very interested to hear how you did it.

Andrew