Android Question Android 14 - Bluetooth slow

[TomKluz]

Hi.
I am struggling with adapting my app to Android 14. After adding Bluetooth permissions everything starts work but not entirely.
Bluetooth transmission became slow. It is not possible to observe values change in real time. They are excessively postponed.
I am using Bluetooth Clasic (2).
Under older version (Android 10) everything is going smoothly.
Does anyone have any experience on this topic ?

 

[Erel]

It is unlikely to be related to changes in Android 14.

First thing is make sure to test it in release mode.

 

[TomKluz]

Thank you very much for taking care of this post.
Unfortunately this is the case when the app is already in the release mode.

 

[zed]

Try on different devices. See if the problem is the same.

 

[TomKluz]

Already tested on Motorola G 04 (my own) and Samsung Galaxy A14 (my friend). Result the same.
(It is not easy for me to find a device to test my app)
Maybe BLE Bluetooth modules are quicker then Bluetooth Clasic ? I have no experience with BLE 4 or 5.

 

[roddy]

Hi.
I am struggling with adapting my app to Android 14. After adding Bluetooth permissions everything starts work but not entirely.
Bluetooth transmission became slow. It is not possible to observe values change in real time. They are excessively postponed.
I am using Bluetooth Clasic (2).
Under older version (Android 10) everything is going smoothly.
Does anyone have any experience on this topic ?

I have the same problem and haven't solved it yet.

 

[f0raster0]

I have the same problem and haven't solved it yet.

simple post your example showing the problem, I can test it in Android 10, 11, 13 and 14

 

[TomKluz]

I have the same problem and haven't solved it yet.

My app is communicating with external inclinometer witch sends data with frequency of 10 Hz . Till Android 13 it was possible to see all value changes smoothly.
May I ask you questions:
What kind of device you are connected with ?
Do you use Bluetooth Classic or BLE ?

 

[roddy]

My app is communicating with external inclinometer witch sends data with frequency of 10 Hz . Till Android 13 it was possible to see all value changes smoothly.
May I ask you questions:
What kind of device you are connected with ?
Do you use Bluetooth Classic or BLE ?

Mobile printer: Samsung SPP-R200 and Zebra MZ220
use Bluetooth Classic

The simple program code is as follows:

Dim Serial1 As Serial
Dim txw As TextWriter
Serial1.Connect("01:02:03:04:05:06")
txw.Initialize2(Main.Serial1.OutputStream,"BIG5")
str1 = "abc..."
txw.WriteLine(str1)
txw.Flush
Serial1.Disconnect

 

[agraham]

I assume you are doing this repetitively, in which case why are you disconnecting Serial1? It will just waste time reconnecting every time.

 

[TomKluz]

Mobile printer: Samsung SPP-R200 and Zebra MZ220
use Bluetooth Classic

OK. You are using Bluetooth to send data . In my case is a problem mainly with receiving data.
Regarding a software, I have started from old Erel's chat example published on this forum. I can't find it recently so I have attached zip.
The problem with speed is larger when more devices are connected. In my case is 2 and I want to observe results simultaneously.
All of this staff works ok under Android 10. With Android 14 finally (after adding permissions) starts work but slowly. This feature makes all idea useless.

I assume you are doing this repetitively, in which case why are you disconnecting Serial1? It will just waste time reconnecting every time.

Thank you for joining. This is a precious comment but I woud like to lern why the same app (even not fully optimized) is significantly slower under Android 14.
I'm hoping that someone has meet this issue and can point if solution depends of software or(and) maybe even hardware.
Should I try BLE? Is it faster in case of new Android ?