B4R Question Remote file access, download

[Mostez]

Hi,
I'm designing a voltage readout logger, data stored on SD card. I want to access log file remotely for example from PC to download stored data(request send from PC to Arduino, user should open download dialog, select desired logger by IP, then download file)

I think something like this would be so great to make, please take a look at this tutorial. but have no luck with C code, how can I make it work with B4R.

Thanks

 

[Erel]

I will prepare an example.

 

[positrom2]

I will prepare an example.

Timer is running....
Kind of contest...

 

[Mostez]

OK Erel, I'm waiting

Thanks

 

[Erel]

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

 

[Mostez]

Thanks Erel,
I ordered Arduino Mega board to run this code.

 

[rbghongade]

Dear friends,
Is it possible to upload a file from PC/android device to sd card connected to arduino / wemos via Wi-Fi ?
If so please provide a demo.

 

[Erel]

Start with this tutorial: https://www.b4x.com/android/forum/threads/arduino-pc-file-transfer.67682/

You only need to change the types of eth and ethServer and maybe the setup code.

 

[rbghongade]

Dear Erel,
Tried to use WeMos as server in AP mode. B4J code connects correctly, sends command , B4R receives command and lists the files on log, but at the B4J end it always lands in AStream_Error sub and hence logs "connection closed".
I have attached my files for your perusal.
Since there is no issue of SPI lines ,I have modified the code accordingly.

 

[Erel]

In the FileTransfer example the connection is closed after each request.

Try to change the delay at the end of AStream_NewData event:

  Delay(1000)
  socket.Close

Is NewData event raised on the B4J side?

 

[rbghongade]

Dear Erel,
Changed the delay but no result.
NewData event is not raised on B4J side.

 

[Erel]

I see. The correct code is:

socket.Stream.Flush
Delay(100)
socket.Close

In ESP8266 the network output is buffered and the call to Socket.Close closes the connection before the data is sent.

 

[rbghongade]

Dear Erel ,
That worked great! Now how can I do the reverse file transfer. File on PC to be uploaded to SD card!

 

[Erel]

This feature is not implemented in this example. You will need to implement it yourself...

 

[rbghongade]

I managed to create a file on SD card , instead of transferring the file with MQTT since the file is very small 150 bytes only!
Thanks Erel!