Problem with FTP keep getting Failed to start FTP transfer

[etuds123]

Hi there,

First I would like to thank you for this amazing library.

As the title says, I'm getting problem transferring data from my SD card to my server.

My code :

/*
  FTP client

 This sketch connects to a FTP server through a MKR GSM 1400 board.

 Circuit:
 * MKR GSM 1400 board
 * Antenna
 * SIM card with a data plan

 created 21 Dec 2018
 by Tryhus
*/

// libraries
#include <MKRGSM.h>
#include <GSMFTP.h>
#include <GSMFileSystem.h>

#include <SPI.h>
#include <SD.h>



#include "arduino_secrets.h" 

// Please enter your sensitive data in the Secret tab or arduino_secrets.h
// PIN Number
const char PINNUMBER[] = SECRET_PINNUMBER;
// APN data
const char GPRS_APN[] = SECRET_GPRS_APN;
const char GPRS_LOGIN[] = SECRET_GPRS_LOGIN;
const char GPRS_PASSWORD[] = SECRET_GPRS_PASSWORD;

//this file must be present in the remote directory SECRET_FTP_REMOTE_DIR
const String c_downloadFileName = "downloadFile";

// initialize the library instance
GSMFTP ftp;
GPRS gprs;
GSM gsmAccess;

void setup() {
  // initialize serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  Serial.println("Starting Arduino FTP client.");
  // connection state
  bool connected = false;

  // After starting the modem with GSM.begin()
  // attach the shield to the GPRS network with the APN, login and password
  while (!connected) {
    if ((gsmAccess.begin(PINNUMBER) == GSM_READY) &&
      (gprs.attachGPRS(GPRS_APN, GPRS_LOGIN, GPRS_PASSWORD) == GPRS_READY)) {
      connected = true;
    }
    else {
      Serial.println("Not connected");
      delay(1000);
    }
  }
  
  Serial.print("Initializing SD card...");

  if (!SD.begin(4)) {
    Serial.println("initialization failed!");
    while (1);
  }
}

void loop() {
 
  GSMFTPElem remoteFile;
 
  
  test("Connect to FTP server",ftp.connect(SECRET_FTP_HOST, SECRET_FTP_USER, SECRET_FTP_PASSWORD, SECRET_FTP_PORT));
  test("Change current remote directory",ftp.cd(SECRET_FTP_REMOTE_DIR));
  test("Display remote files",ftp.ls(remoteFile, true));

  
  sendSDFile("test.txt", "datalogInFTPServer.txt", 1024);
  
  for (;;)
    ;
}


bool test(const String& msg, bool function)
{
  if (function == true) {
    Serial.print("OK - ");
  }
  else {
    Serial.print("ERROR - ");
  }
  Serial.println(msg);

  return function;
}

bool sendSDFile(const String& SDfileName, const String& FTPfileName, uint16_t packetSize)
{
  bool ok = true;
  int res = 0;
  uint32_t remainingBytes = 0;
  File file;

  char* packet = new char[packetSize];
  if (packet == nullptr) {
    Serial.println("Allocation error");
    return false;
  }

  file = SD.open(SDfileName);
  if (file == false) {
    Serial.println("Failed to open SD file");
    goto Err;
  }

  remainingBytes = file.size();

  //Start FTP transfer in stream mode
  
  if (ftp.streamInStart(FTPfileName) == false) {
    Serial.println("Failed to start FTP transfer");
    goto Err;
  }
  
  while (remainingBytes > 0) {
    uint32_t bytes = (remainingBytes >= packetSize) ? packetSize : remainingBytes;

    //read a packet of data
    if (file.readBytes(packet, bytes) != bytes) {
      Serial.println("Failed to read SD file");
      goto Err;
    }

    //send the packet to the FTP server
    if (ftp.streamOut(packet, bytes) == false) {
      Serial.println("Failed to send data to FTP server");
      goto Err;
    }
    remainingBytes -= bytes;
  }

  //wait for the transfer to be completed
  while (res == 0) {
    res = ftp.streamOutReady();
  }

  if (res != 1) {
    Serial.println("Failed to send data to FTP server");
    goto Err;
  }

  goto Out;

Err:
  ok = false;
Out:
  file.close();
  if (packet != nullptr) {
    delete[] packet;
  }
  return ok;
}

the Output :

Starting Arduino FTP client.
Initializing SD card...OK - Connect to FTP server
OK - Change current remote directory
drwx--x--- 6 717968 48 4096 May  9 13:46 .
drwx--x--- 6 717968 48 4096 May  9 13:46 ..
-rw-r--r-- 1 717968 717968 128000 May  8 16:11 FileToStream
-rw-r--r-- 1 717968 717968 128 May  8 16:05 myFile.txt
-rw-r--r-- 1 717968 717968 0 May  8 11:53 new_file
drwxr-xr-x 2 717968 717968 6 May  8 11:42 op
drwx--x--- 11 717968 48 4096 May  8 15:56 public_html
drwx--x--- 2 717968 717968 4096 Jul 16  2018 tmp
OK - Display remote files
Failed to start FTP transfer

As the output shows, the Arduino connect successfully to the server via FTP but it always say "Failed to start FTP transfer".

[sandeepmistry]

This library currently does not support FTP, however there is a pull request open for this - I suggest you comment there if that's what you are using: #73