Android Question Bluetooth problem: UUID and device searching

[Kanne]

Hi,
I just implemented a file transfer with code from the older filetransfer-example.
It working so far, but now I have some questions:

1. UUID
What is the UUID ("dabcabcd-afac-11de-8a39-0800200c9a6") used for ?
Can I use the one from the example or do I have to calculate a new one ?

2. searching BT devices
when starting the activity a spinner is filled with paired devices - this works well.
When searching for new devices my old Sony Xperia finds my newer MotoG5 3 times (which can be handles) but my MotoG5 does not find any device.
Connecting without search can be made to the Sony Xperia ...

 

[Erel]

What is the UUID ("dabcabcd-afac-11de-8a39-0800200c9a6") used for ?

I don't know which example you are talking about. Best if you post the relevant code.

MotoG5 does not find any device

Start with this example: Android Bluetooth / BluetoothAdmin Tutorial
Make sure that the other device is discoverable.

 

[Kanne]

the source was copied from

FileTransfer - Send and receive files with AsyncStreams

Newer example based on B4XSerializator: https://www.b4x.com/android/forum/threads/72149 AsyncStream v1.50 (part of RandomAccessFile library) includes support for sending and receiving streams of any size. Unlike the regular write methods that send an array of bytes there is a new WriteStream...

www.b4x.com

I also downloaded

[B4X] Network + AsyncStreams + B4XSerializator

Better implementation, based on B4XPages: https://www.b4x.com/android/forum/threads/b4x-b4xpages-network-asyncstreams-b4xserializator.119011/#content New video tutorial: This is a simple and important example. It demonstrates several good practices related to network...

www.b4x.com

but there seems to be only WLAN-transfer and no BT implementation.

 

[Erel]

You should start with: Android Bluetooth / BluetoothAdmin Tutorial

but there seems to be only WLAN-transfer and no BT implementation.

It doesn't really matter. You work with AsyncStreams which behaves the same in both cases.

 

[Kanne]

Sure, but the problem is not the filetransfer (which is working) but the search of the BT devices.
All examples with BT have similar problems on my devices: paired devices are shown on startup but new search does only work on my old sony xperia (4.4) whereas no devices are found on moto g5 and lenovo tab which are both running with newer android release.
Maybe the newer devices need an additional permission ?

 

[Erel]

Maybe the newer devices need an additional permission ?

That's true and is already implemented in the link I posted two times.