[PRJ] Improve Bluetooth in Car

Wisefire · Apr 9, 2011

I used to have the drop out problem with my Kenwood BT200. I had to repair every time I got in the car. I recently upgraded to CM7 with 2.3.3 and then switched to MIUI 2.3.3 and both work flawlessly. I'm assuming the updated Bluetooth stack resolved my issue.

Tratas88 · Apr 9, 2011

Using my Nexus One (CM7 RC4) with a new Mercedes E-Class and the builtin "Command" System and a very recent Volkswagen Golf with original Bluetooth Audio, both working perfectly. In the Golf it isnt possible to skip titles, but the basic speech and music functions work on both cars.

scotte9999 · Apr 9, 2011

d1mitrov said:
i think thats exactly what my problem is, when the phone is connected to the car and the music gateway is connected as well i get the intermittent connection and it skips every so often but if i disconnect the phone part then the music never skips...however im not on CM7 so i dont know if that fix applies to me and i dont know how to begin changing those settings

It does apply to CM7 (although likely to CM6 as well, but CM6 may have had the Master=true default already).

You can use Root Explorer or ADB to replace /etc/bluetooth/audio.conf with the file attached. (Then reboot to have it take effect).

d1mitrov · Apr 10, 2011

ok so i checked that file and the only thing different in it and the one i had was #MaxConnections was set to 1 in mine and 3 in the one you gave me, so i changed that and also mine said #Switch to master role for incoming connections (defaults to true) and the one you gave me said #Do not require master role for incoming connections so i changed that as well and i still have the same problem :/
I dont know if i did it right cuz i couldnt figure out how to replace the whole file so i just edited whatever was different

scotte9999 · Apr 10, 2011

Interesting.

To be clear, you have Master=True, HFP=true, and MaxConnections=3 ?

Specifically, the Master=True is what lets my Kenwood head-unit stream w/o skipping. Hmm.

Did you see any negative effects from making that change?

ianken · Apr 11, 2011

The audio.conf attached above seems to have done it for me. I made the same edits myself and pushed it via adb but it didn't work, and thats pretty odd. This one I pushed down via root explorer.

With my luck the hands free will fail now...

Sent from my Nexus One using XDA App

elfblackdeath · Apr 13, 2011

scotte9999 said:
It does apply to CM7 (although likely to CM6 as well, but CM6 may have had the Master=true default already).

You can use Root Explorer or ADB to replace /etc/bluetooth/audio.conf with the file attached. (Then reboot to have it take effect).

Im going to push it today and update if this solves my skip issue. Also any idea when this will be pushed to the CM nightly?

Update: fixed my problem. thank you!

scotte9999 · Apr 13, 2011

Glad it helped!

I've submitted the change to CM via Gerrit, but it needs a reviewer and approver before it can get committed. If you want to find folks on IRC or the forums and lobby to get it committed, that would help.

elfblackdeath · Apr 13, 2011

That sounds good to me, will try to lobby for it.

Basil 123 · Apr 14, 2011

since updating to CM7 RC4 my parrot handsfree has become unuseable - I can hear others but they cant hear me.

Will try this change and see if it fixes things. Thanks!

Basil 123 · Apr 14, 2011

Hi, that file seems to have fixed my BT parrot carkit. Thanks a million!

knightnz · Apr 14, 2011

Basil 123 said:
since updating to CM7 RC4 my parrot handsfree has become unuseable - I can hear others but they cant hear me.

Will try this change and see if it fixes things. Thanks!

You sure it's not just the wonk issue? Did you give it about 10 seconds to see if it cleared up?

(Does the wonk issue even effect bluetooth?)

d1mitrov · Apr 25, 2011

scotte9999 said:
Interesting.

To be clear, you have Master=True, HFP=true, and MaxConnections=3 ?

Specifically, the Master=True is what lets my Kenwood head-unit stream w/o skipping. Hmm.

Did you see any negative effects from making that change?

could you guide me on how to push the whole file??

scotte9999 · Apr 27, 2011

d1mitrov said:
could you guide me on how to push the whole file??

adb remount
adb pull /etc/bluetooth/audio.conf c:\audio.conf_backup
adb push c:\audio.conf_new /etc/bluetooth/audio.conf
adb reboot

knightnz · Apr 27, 2011

The problem I have with my bluetooth is that if I have the phone connected and then turn the ignition on, the head unit drops out for a fraction of a second and more often than not the phone won't then reconnect to it afterwards unless I take it out of the dock, wait for it to turn bluetooth off, then put it back in.

Any way to get the phone to reconnect short of buying a new car with a better electrical system?

It's a Sony MEX-something headunit.

Drewbert34 · Apr 27, 2011

Worked like a charm with my blackberry bluetooth receiver in my car! Thanks a million!

grkn · Jun 3, 2011

Hi, I made those changes running CM 7.0.3 on the inspire and trying to connect it to a Belkin bluetooth receiver which my laptop auto connects to just fine.

What I found is that the phone will auto connect in turning bluetooth on from an off state, is there any way to make it connect with bluetooth constantly on?

The workaround im currently using is using tasker to start bluetooth when I launch my audio apps, and to shut it down when I close them.

Cheers!

knightnz · Jun 10, 2011

grkn said:
Hi, I made those changes running CM 7.0.3 on the inspire and trying to connect it to a Belkin bluetooth receiver which my laptop auto connects to just fine.

What I found is that the phone will auto connect in turning bluetooth on from an off state, is there any way to make it connect with bluetooth constantly on?

The workaround im currently using is using tasker to start bluetooth when I launch my audio apps, and to shut it down when I close them.

Cheers!

There should be a line "AutoConnect=true" in the audio.conf file, make sure this is enabled and set to "true" and if you're lucky then the bluetooth device will try and auto-connect to either the A2DP or HFP/HSP connection which will cause the phone to try and reconnect both connections.

This magic modification has made my Panasonic bluetooth adaptor work like a charm. It will automatically search for the last connected handsfree device (my N1) and when it reconnects to that as soon as I turn the power on, the N1 will try and reconnect the A2DP connection as well. I've set PowerAmp to automatically pause/resume on disconnect/connect and I've got a bluetooth toggle button on my homescreen, and the "Car Home" app set to autolaunch when a connection to the Panasonic unit is initiated.

So, all I do, is turn the car ignition on, enable bluetooth and wait for a few seconds. The headunit connects to the handsfree which causes the A2DP to auto-connect back to the headunit, then Car Home launches, then PowerAmp kicks in and starts playing.

I've got a tasker script to disable bluetooth automatically once Car Home quits which I've set to happen after 10 seconds of the connection being gone.

It all works flawlessly, very pleased!

Now, we just have to convince the CyanogenMod team to make these mods standard rather than the dopey default settings.

grkn · Jun 10, 2011

That's not as automatic as I'd want, I want to make the connection happen without having to enable bluetooth.

My current workaround is a tasker script that enables bluetooth when I start and audio player (it then auto connects), and disables it a while after I shut the player down. It's smooth enough, but not perfect.

knightnz · Jun 10, 2011

grkn said:
That's not as automatic as I'd want, I want to make the connection happen without having to enable bluetooth.

My current workaround is a tasker script that enables bluetooth when I start and audio player (it then auto connects), and disables it a while after I shut the player down. It's smooth enough, but not perfect.

If I leave bluetooth on all the time, then all I need to do is turn the ignition on, and off it goes after about 10 seconds once the headunit & BT module sort themselves out. I've only got the on/off setting on the homescreen to save power as I don't use bluetooth otherwise.

[PRJ] Improve Bluetooth in Car

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