ESP8266 NodeMCU, SD CARD & SimpleFtpServer

[BrunoPicard]

Hello from France,

First of all, thanks to Renzo for all his work.
I have adapted one of Renzo’s examples (Arduino_esp32_SD) to transfer files via FTP between an SD CARD and my PC. When I upload files to the SD CARD, everything works perfectly. However, if I download files from the SD CARD to the PC, the file is created in the destination directory, but it’s empty.
I use the SD / ESP8266WiFi / SimpleFTPServer libraries.
I’ve tried this with several FTP clients and files of different sizes: the target file is always empty.
I should add that I read the file on the SD CARD with this code:

File config_SD = SD.open("config.txt","r"); 
 if (!config_SD.available()) {
      while (config_SD.available()){
          Serial.println(config_SD.readStringUntil('\n')); 
      }
  }
 config_SD.close(); 

Could you please give me a hint?
Thank you and have a nice day.
Bruno

• This topic was modified 8 months, 1 week ago by BrunoPicard.
• This topic was modified 8 months, 1 week ago by BrunoPicard.

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[Renzo Mischianti]

Hi,
You have set the filezilla whit the correct parameter?
Bye Renzo

[BrunoPicard]

Hi Renzo,
Thanks for the feedback 🙂
Filezilla is well configured: upload to SD CARD works perfectly. It’s the same using WinFTP.
With the same settings, FTP works with another project that uses flash memory storage.

The only changes to Arduino_esp32_SD.ino are :

#include <WiFi.h>
becomes
#include <ESP8266WiFi.h>

and

SPI.begin(14, 12, 15, 13); //SCK, MISO, MOSI,SS
if (SD.begin(13, SPI)) {

becomes

#define CS_PIN D8 
[...]
if (SD.begin(CS_PIN )) {

• This reply was modified 8 months, 1 week ago by BrunoPicard.
• This reply was modified 8 months, 1 week ago by BrunoPicard.
• This reply was modified 8 months, 1 week ago by BrunoPicard.
• This reply was modified 8 months, 1 week ago by BrunoPicard.
• This reply was modified 8 months, 1 week ago by BrunoPicard.

[BrunoPicard]

Hi,

I traced the code and found out why the file is empty. The file.read() function always returns nb=0. Now I just need to find out why…

boolean FtpServer::doRetrieve()
{
if (data.connected())
{
	int16_t nb = file.readBytes(buf, FTP_BUF_SIZE);
        if (nb > 0)
[...]

[BrunoPicard]

I can confirm that this is a bug in the SimpleFtpServer librairy, so there’s no need to check the FTP client settings.

[Renzo Mischianti]

Hi, the stream.readBytes must return the number of bytes read, as the documentation specifies, so I think it’s an ESP core temporary bug.
But I check better next.
Thanks for your feedback, RM

[BrunoPicard]

Hi, This is not a core bug.

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