AndroidOS and CarPlay - BT Connection Disconnected After CarPlay Handshake - General Questions and Answers

Hello Everyone,
I am a new AndroidOS user and recently had a friend help me install a head-unit to my Audi A4. The head-unit is similar to the following model:
Audi/Seat | Qualcomm 665| Android / iPhone | Octa Core | 6GB RAM &128GB ROM | Integrated 4G Solution | IQ82A4AL
XTRONS IQ82A4AL is a brand new Octa-core car sereo for Audi/Seat with Qualcomm 665 6GB RAM 128GB ROM Integrated 4G solution plus the latest in-car entertainment features premium quality built-in DSP, CarPlay & Android Auto and more.
xtrons.com
Background:
I have noticed that when I INITIALLY pair my iPhone to the Android head-unit over BT, it will ask me to pair on my iPhone (which I confirm), and then switch to CarPlay automatically. At this point everything dealing with CarPlay is handled over Wifi (not BT), but if I go back to the main AndroidOS UI, and check if my BT is still paired, is it DISCONNECTED. I am also able to confirm that the BT connection is disconnected on my iPhone as well. Each subsequent connection, as soon as I turn on the car and it connects to my phone (over BT), it switches to CarPlay, and then the BT disconnects. I would have assumed the BT connection would still be active and paired at this point.
Question:
Is the BT connection being disconnected (after CarPlay is initialized) expected behavior? I chatted with my friend who is an Android-Auto user, and he said with his setup (using similar head-unit), the BT connection is ACTIVE even after Android Auto takes over control.
Any feedback on how this is supposed to work for Apple iPhone users, utilizing the CarPlay functionality, would be greatly appreciated. If I could provide any additional information on my side, to assist with troubleshooting, please let me know.
Thanks,
Asif

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Erisin PX5,Android 9.0 Bluetooth issues

Hi,
I was wondering if I could get some help with my issue. I bought an Erisin ES8049U head unit that I am trying to connect to my cars after market engine management system via Bluetooth. The head unit discovers the engine management system but it's quite troublesome to connect to it. Sometimes it connects, sometimes it doesnt. The Bluetooth connection to the cars engine management unit works fine from my Samsung mobile, so the problem is in the Erisin head unit.
Also when I finally get it to connect, no data comes through to the engine management system, it's like its not even connected and sometimes it flashes connected/disconnected.
Here are the info on the system:
PX5
Android 9
Build: rk3368-userdebug 9PQ2A. 190305.002 20191113.183229 test-keys
Kernel: 4.4.167
MCU: MTCE_LM_V3.43_1 / DEC 17.2019
CPU: Octa-core Cortex-A53 @ 1.5G
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2JZHX60 said:
Hi,
I was wondering if I could get some help with my issue. I bought an Erisin ES8049U head unit that I am trying to connect to my cars after market engine management system via Bluetooth. The head unit discovers the engine management system but it's quite troublesome to connect to it. Sometimes it connects, sometimes it doesnt. The Bluetooth connection to the cars engine management unit works fine from my Samsung mobile, so the problem is in the Erisin head unit.
Also when I finally get it to connect, no data comes through to the engine management system, it's like its not even connected and sometimes it flashes connected/disconnected.
Here are the info on the system:
PX5
Android 9
Build: rk3368-userdebug 9PQ2A. 190305.002 20191113.183229 test-keys
Kernel: 4.4.167
MCU: MTCE_LM_V3.43_1 / DEC 17.2019
CPU: Octa-core Cortex-A53 @ 1.5G
BT chip that has been selected in the system by default is: SD-8350
I've read some of the BT connectivity issues and they mostly have had different BT chips installed, at least originally. Any idea which chip I could test from the list, or is there a MCU that would fix connectivity issues? Or any other things I could do?
Click to expand...
Click to collapse
OK, I got it to show the data from the engine managament unit when I disabled Wireless and after that it started connecting. But if I restart the car, it doesnt want to connect to the application. With my phone it works flawlessly. I wonder if it's an application error or something to do with the head unit.

Bluetooth functionality for PX30

I got a XTRONS Android 9 PX30 RK3326 MTCE. I'm wondering if there are any ROMs that would work like the Hal9k or Maliysk ROM for instance, that would enable better bluetooth functionality. I am fully able to use the OBD2 TORQUE with Bluetooth (with connection issues after a soft-reboot or going to sleep). I want to also use an RGB controller app to control Bluetooth Rock Lights. However when doing so I cannot find the device no matter what. I am not sure if it is just software (I would assume) that disables this function considering Torque works perfectly and connects to the OBD2. Any feedback would be helpful. I just do not understand (expect software wise) why an RGB app cannot connect to a device but TORQUE can.

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I am using Samsung S21 with Exynos processor in India that has Wireless AA support.
Head unit on paper says "Wireless + Wired Apple car play support but only wired for Android Auto".
The stereo has an app called Car Link that has to be opened on head unit screen to work while to connect your phone using USB Cable. It works with USB as mentioned. But I am looking to get the wireless support as well.
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Thanks
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It seems that Android Auto (including wireless via Motorola M1) works flawlessly for a few days after setting it up.
Once it enters the "looking for Android Auto" mode there's no other way than removing cache and app settings and establishing the phone -car connection from scratch. And after doing so, it will work for a few days until it starts looking and not connecting again.
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I also have the AAWireless device somewhere and I'll have a look.
Check the Android Auto forums, maybe some info there...
Android Auto General
General discussion about Google's Android Auto.
forum.xda-developers.com
My wife and I have been using wireless (and wired) Android Auto in our car with the P7P for three weeks with no issues like this. Our car's head unit doesn't have native wireless AA, though - we're using AAWireless. Could be just the head unit or the car needs a firmware update (my car has occasionally received one when I have it connected to my home's Wi-Fi).
roirraW edor ehT said:
My wife and I have been using wireless (and wired) Android Auto in our car with the P7P for three weeks with no issues like this. Our car's head unit doesn't have native wireless AA, though - we're using AAWireless. Could be just the head unit or the car needs a firmware update (my car has occasionally received one when I have it connected to my home's Wi-Fi).
Click to expand...
Click to collapse
I didn't have these issues with my old Huawei.
domi_niku said:
I didn't have these issues with my old Huawei.
Click to expand...
Click to collapse
I've noticed very different Android Auto experiences with the same phone but different car brands before. I've used Android Auto in either 4 cars so far, two of them rentals. I believe my rental VW's Android Auto was horrendously slow and hard to get the touchscreen to respond, whatever the next rental was, was fine. Chevy and Subaru have been fine, too, although my Chevy Android Auto experience seemed better than Subaru, but the Subaru is acceptable.

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