B4R Question Sending files from ESP32 (B4R) to B4A

[TomKluz]

Hello,
I am quite new in B4R section. So far I have used only native Arduino for Atmel based project and B4A.
Recently I would like to make an exercise and try to use ESP32 Cam to make photos and send it via Bluetooth Clasic to B4A app using B4R.

May I ask for the advice how to send a photo (jpeg) in a safe way from B4R to B4A ? Posibly some example or sketch ?
I didn't found an answer so far within our Comunity.

Kind regards
TomKluz

 

[Erel]

Check this: https://www.b4x.com/android/forum/threads/arduino-pc-file-transfer.67682/#content

 

[TomKluz]

Hello,

I have already seen this thread. Is it no matter that this is wifi transfer ?

TomKluz

 

[derez]

Check this https://www.b4x.com/android/forum/t...treaming-updated-with-code.110131/post-687525
The pictures/video can be loaded to a webview in android.

 

[TomKluz]

Thank you very much. It is great tutorial. Most examples (also in native Arduino) are made with WiFi.
About Bluetooth I have found only simple Chat example and nothing else.
I would like to use BT in my exercise.
TomKluz

 

[Erel]

It doesn't matter. Once there is a connection, you are working with AsyncStreams in both cases.

 

[TomKluz]

At last I have make ESP32 Cam sending constantly jpg photos via Bluetooth Classic. (It has no PIN at all. I don't know why). So far in native Arduino.
Unfortunatelly file content is splited into parts, as it already happend before with strings.
My question is:
May I be sure that AsyncStreamsPrefix mode made on both sides B4R and B4A will give guarantee that file will come in one piece (not splitted) ?
TomKluz

 

[Erel]

You should never assume that the data will arrive as a single packet, with the exception of prefix mode. However unless the files are small than sending them as a single message will fail.

The code here writes the files sequentially: https://www.b4x.com/android/forum/threads/arduino-pc-file-transfer.67682/#content

 

[TomKluz]

Thank you for pointing me this tutorial.
Life is always more complicated then we think. For sure above mentioned example is not easy to understand to me, at first moment. I need some time.
For now I have got a result in such simple way. I am looking for a text "JFIF" which is always in a header of jpg file in every data package (buffer).
Depending on this, data package is added to the end of file or not. So far it is working.

TomKluz