MultiFTPServer Library Tutorial for ESP32, Raspberry Pi Pico, Arduino, rp2040, esp8266 and STM32

Renzo Mischianti

5 hours ago

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Finally, we can say hello to MultiFTPServer, a lean, drop-in successor to SimpleFTPServer that finally brings true multi-session FTP to the hobby boards and industrial MCUs you love. With a single, unified API, you can now stream files to and from ESP8266, ESP32, STM32, classic Arduino boards, and the Raspberry Pi Pico W, all at the same time, all from the same sketch or firmware. Under the hood, the library adds an event-driven connection manager, smarter memory handling, and authentication hooks, so your data stays fast and safe even on devices with kilobytes to spare. In the pages ahead, we’ll unpack what changed, why parallel connections matter in real-world IoT workflows, and how to get MultiFTPServer running in minutes on your next project.

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Features

Multiple concurrent FTP sessions (Set to 2 by default; before setting a superior number of sessions, check the library and microcontroller specification).
There is support for various storage backends, including SD, SPIFFS, LittleFS, FFat, Seeed SD, SdFat, and more.
Compatibility with multiple network interfaces: WiFi, Ethernet, and ENC28J60.
Customizable buffer sizes for optimized performance.
UTF-8 support for filenames.
Easy-to-use callbacks for operations and transfers.
Extensive debug support.

Why MultiFTPServer?

The new MultiFTPServer library addresses the limitations of SimpleFTPServer by allowing multiple simultaneous connections while maintaining a similar configuration structure. This makes it an ideal choice for applications requiring efficient file management over networks.

Library Availability

The MultiFTPServer library is available in the Arduino Library Manager. Search for “MultiFTPServer” and install it directly into your IDE.

You can also download the source code from GitHub:

For low-power MCUs that can’t handle multiple sessions, or if you simply don’t need concurrent sessions—stick with the reliable, time-tested SimpleFTPServer.

Configuration Options

MultiFTPServer supports various storage types and network configurations. Modify the FtpServerKey.h file to tailor the library to your project. Here are some options:

/********************************************************************************
 * FtpServer for:
 *  - Arduino
 *  - Arduino SAMD (WiFiNINA)
 *  - esp8266
 *  - esp32
 *  - STM32
 *  - Raspberry Pi Pico W
 *
 * Derived form Jean-Michel Gallego version
 * AUTHOR:  Renzo Mischianti
 *
 * https://www.mischianti.org/category/my-libraries/simple-ftp-server/
 *
 ********************************************************************************/

/*******************************************************************************
 **                                                                            **
 **                         SETTINGS FOR FTP SERVER                            **
 **                                                                            **
 *******************************************************************************/

#ifndef FTP_SERVER_CONFIG_H
#define FTP_SERVER_CONFIG_H

// Uncomment to enable printing out nice debug messages.
// #define FTP_SERVER_DEBUG
// #define FTP_ADDITIONAL_DEBUG

// Define where debug output will be printed.
#define DEBUG_PRINTER Serial

#define STORAGE_SDFAT1 		1 	// Library SdFat version 1.4.x
#define STORAGE_SDFAT2 		2 	// Library SdFat version >= 2.0.2
#define STORAGE_SPIFM  		3 	// Libraries Adafruit_SPIFlash and SdFat-Adafruit-Fork
#define STORAGE_FATFS  		4 	// Library FatFs
#define STORAGE_SD 			5 	// Standard SD library (suitable for Arduino esp8266 and esp32
#define STORAGE_SPIFFS 		6 	// SPIFFS
#define STORAGE_LITTLEFS 	7 	// LITTLEFS
#define STORAGE_SEEED_SD 	8 	// Seeed_SD library
#define STORAGE_FFAT  		9 	// ESP32 FFAT
#define STORAGE_SD_MMC		10 	// SD_MMC library

#define NETWORK_ESP8266_ASYNC 	(1)
#define NETWORK_ESP8266 		(2) 	// Standard ESP8266WiFi
#define NETWORK_ESP8266_242 	(3) 	// ESP8266WiFi before 2.4.2 core
#define NETWORK_W5100 			(4)		// Standard Arduino Ethernet library
#define NETWORK_ETHERNET		(4)		// Standard Arduino Ethernet library
#define NETWORK_ENC28J60 		(5) 	// UIPEthernet library
#define NETWORK_ESP32 			(6) 	// Standard WiFi library
#define NETWORK_RP2040_WIFI		(15) 	// Raspberry Pi Pico W standard WiFi library
#define NETWORK_ESP32_ETH 		(7)		// Standard ETH library
#define NETWORK_WiFiNINA 		(8)		// Standard WiFiNINA library
#define NETWORK_SEEED_RTL8720DN (9) 	// Standard SEED WiFi library
#define NETWORK_ETHERNET_LARGE 	(10)
#define NETWORK_ETHERNET_ENC 	(11)	// EthernetENC library (evolution of UIPEthernet
#define NETWORK_ETHERNET_STM 	(12)
#define NETWORK_UIPETHERNET 	(13)	// UIPEthernet library same of NETWORK_ENC28J60
#define NETWORK_ETHERNET_GENERIC	(14)	// Ethernet generic

// esp8266 configuration
#ifndef DEFAULT_FTP_SERVER_NETWORK_TYPE_ESP8266
	#define DEFAULT_FTP_SERVER_NETWORK_TYPE_ESP8266 	NETWORK_ESP8266
	#define DEFAULT_STORAGE_TYPE_ESP8266 				STORAGE_LITTLEFS
#endif
// esp32 configuration
#ifndef DEFAULT_FTP_SERVER_NETWORK_TYPE_ESP32
	#define DEFAULT_FTP_SERVER_NETWORK_TYPE_ESP32 		NETWORK_ESP32
	#define DEFAULT_STORAGE_TYPE_ESP32 					STORAGE_FFAT
	/**
To use Ethernet.h with esp32 fix would be to change in Ethernet.h the line
class EthernetServer : public Server {
to
class EthernetServer : public Stream {

or

in \esp32\2.0.6\cores\esp32\Server.h
A workaround is to change line 28 of the ESP32 core's Server.h from:
    virtual void begin(uint16_t port=0) =0;
to
    virtual void begin() =0;
However, the last one, that will break anything that uses the ESP32 WiFi library's WebServer class.

https://github.com/arduino-libraries/Ethernet/issues/193
https://github.com/arduino-libraries/Ethernet/issues/88
	 *
	 */
#endif
// Standard AVR Arduino configuration
#ifndef DEFAULT_FTP_SERVER_NETWORK_TYPE_ARDUINO
	#define DEFAULT_FTP_SERVER_NETWORK_TYPE_ARDUINO 	NETWORK_W5100
	#define DEFAULT_STORAGE_TYPE_ARDUINO 				STORAGE_SD
#endif
// STM32 configuration
#ifndef DEFAULT_FTP_SERVER_NETWORK_TYPE_STM32
	#define DEFAULT_FTP_SERVER_NETWORK_TYPE_STM32 		NETWORK_W5100
	#define DEFAULT_STORAGE_TYPE_STM32 					STORAGE_SDFAT2
#endif
// Raspberry Pi Pico (rp2040) configuration
#ifndef DEFAULT_FTP_SERVER_NETWORK_TYPE_RP2040
    #define DEFAULT_FTP_SERVER_NETWORK_TYPE_RP2040 		NETWORK_RP2040_WIFI
	#define DEFAULT_STORAGE_TYPE_RP2040					STORAGE_LITTLEFS
#endif

// Arduino SAMD21 like Arduino MKR Nano 33 IoT or Wio Terminal
#ifndef DEFAULT_FTP_SERVER_NETWORK_TYPE_ARDUINO_SAMD
// Wio Terminal
//	#define DEFAULT_FTP_SERVER_NETWORK_TYPE_SAMD NETWORK_SEEED_RTL8720DN
//	#define DEFAULT_STORAGE_TYPE_SAMD STORAGE_SEEED_SD

// Arduino SAMD
	#define DEFAULT_FTP_SERVER_NETWORK_TYPE_SAMD 		NETWORK_WiFiNINA
	#define DEFAULT_STORAGE_TYPE_SAMD 					STORAGE_SD
#endif

#define UTF8_SUPPORT

//#define SD_CS_PIN 4
// Disconnect client after 5 minutes of inactivity (expressed in seconds)
#ifndef FTP_TIME_OUT
	#define FTP_TIME_OUT  5 * 60
#endif


// Wait for authentication for 10 seconds (expressed in seconds)
#ifndef FTP_AUTH_TIME_OUT
	#define FTP_AUTH_TIME_OUT 10
#endif


// Size of file buffer for read/write
// Transfer speed depends of this value
// Best value depends on many factors: SD card, client side OS, ... 
// But it can be reduced to 512 if memory usage is critical.
#ifndef FTP_BUF_SIZE
	#define FTP_BUF_SIZE 1024 //2048 //1024 // 512
#endif
// Define the maximum number of concurrent sessions
#ifndef FTP_MAX_SESSIONS
    #define FTP_MAX_SESSIONS 2
#endif

#endif // FTP_SERVER_CONFIG_H

Adjust these definitions to match your hardware setup.

For example the ESP32 section

#ifndef DEFAULT_FTP_SERVER_NETWORK_TYPE_ESP32
	#define DEFAULT_FTP_SERVER_NETWORK_TYPE_ESP32 		NETWORK_ESP32
	#define DEFAULT_STORAGE_TYPE_ESP32 					STORAGE_FFAT
#endif

Allow to define the network by changing the value by changing the value of this line.

	#define DEFAULT_FTP_SERVER_NETWORK_TYPE_ESP32 		NETWORK_ESP32

There are a large set of values, but only some are allowed for a specified microcontroller family.

#define NETWORK_ESP8266_ASYNC 	(1)
#define NETWORK_ESP8266 		(2) 	// Standard ESP8266WiFi
#define NETWORK_ESP8266_242 	(3) 	// ESP8266WiFi before 2.4.2 core
#define NETWORK_W5100 			(4)		// Standard Arduino Ethernet library
#define NETWORK_ETHERNET		(4)		// Standard Arduino Ethernet library
#define NETWORK_ENC28J60 		(5) 	// UIPEthernet library
#define NETWORK_ESP32 			(6) 	// Standard WiFi library
#define NETWORK_RP2040_WIFI		(15) 	// Raspberry Pi Pico W standard WiFi library
#define NETWORK_ESP32_ETH 		(7)		// Standard ETH library
#define NETWORK_WiFiNINA 		(8)		// Standard WiFiNINA library
#define NETWORK_SEEED_RTL8720DN (9) 	// Standard SEED WiFi library
#define NETWORK_ETHERNET_LARGE 	(10)
#define NETWORK_ETHERNET_ENC 	(11)	// EthernetENC library (evolution of UIPEthernet
#define NETWORK_ETHERNET_STM 	(12)
#define NETWORK_UIPETHERNET 	(13)	// UIPEthernet library same of NETWORK_ENC28J60
#define NETWORK_ETHERNET_GENERIC	(14)	// Ethernet generic

Samething for the reference filesystem.

	#define DEFAULT_STORAGE_TYPE_ESP32 					STORAGE_FFAT

By default the value is FFAT, but you can chose from this list some other values.

#define STORAGE_SDFAT1 		1 	// Library SdFat version 1.4.x
#define STORAGE_SDFAT2 		2 	// Library SdFat version >= 2.0.2
#define STORAGE_SPIFM  		3 	// Libraries Adafruit_SPIFlash and SdFat-Adafruit-Fork
#define STORAGE_FATFS  		4 	// Library FatFs
#define STORAGE_SD 			5 	// Standard SD library (suitable for Arduino esp8266 and esp32
#define STORAGE_SPIFFS 		6 	// SPIFFS
#define STORAGE_LITTLEFS 	7 	// LITTLEFS
#define STORAGE_SEEED_SD 	8 	// Seeed_SD library
#define STORAGE_FFAT  		9 	// ESP32 FFAT
#define STORAGE_SD_MMC		10 	// SD_MMC library

The most used alternatives for ESP32 are LittleFS, SPIFFS (standard for the old core), and naturally SD.

Features in Detail

Multi-Session Support

To enable multiple sessions, configure the FTP_MAX_SESSIONS parameter in the configuration:

    #define FTP_MAX_SESSIONS 2

This allows two concurrent FTP sessions.

Debugging

Enable debugging to print detailed logs:

#define FTP_SERVER_DEBUG
#define FTP_ADDITIONAL_DEBUG

Debug messages are printed to Serial. You can change the debug output by redefining DEBUG_PRINTER:

#define DEBUG_PRINTER Serial

Buffer Size

The buffer size determines transfer speed and memory usage. Configure it in the configuration file:

#define FTP_BUF_SIZE 1024

Authentication Timeout

Set the timeout for user authentication:

#define FTP_AUTH_TIME_OUT 10

Session Timeout

Set the timeout for inactive sessions:

#define FTP_TIME_OUT 300

UTF-8 Filename Support

UTF-8 filenames are supported by default. Ensure UTF8_SUPPORT is defined in the configuration file.

#define UTF8_SUPPORT

Examples

The default configuration for ESP32 uses the FFat filesystem, and here is an example of an FTP server.

/*
 * Simple FTP Server Example with FFat on ESP32
 *
 * AUTHOR: Renzo Mischianti
 * URL: https://www.mischianti.org
 *
 * DESCRIPTION:
 * This example demonstrates the use of the MultiFTPServer library
 * with the FFat file system on an ESP32. The sketch connects to a WiFi network,
 * initializes the FFat file system, and sets up an FTP server for file management.
 */

#include <Arduino.h>
#include <FS.h>
#include <FFat.h>
#include <WiFi.h>
#include <MultiFTPServer.h>

// WiFi credentials
const char* WIFI_SSID = "reef-casa-sopra";    // Replace with your WiFi SSID
const char* WIFI_PASSWORD = "aabbccdd77";     // Replace with your WiFi password

// FTP server instance
FtpServer ftpServer;

void setup() {
  // Initialize Serial Monitor
  Serial.begin(115200);
  Serial.println("Initializing...");

  // Connect to WiFi network
  Serial.printf("Connecting to WiFi: %s\n", WIFI_SSID);
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);

  // Wait for WiFi connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected!");
  Serial.printf("Connected to: %s\n", WIFI_SSID);
  Serial.printf("IP Address: %s\n", WiFi.localIP().toString().c_str());

  // Initialize FFat file system
  Serial.println("Initializing FFat file system...");
  if (FFat.begin(true)) { // Auto-format FFat if not already formatted
    Serial.println("FFat initialized successfully!");
    Serial.println("Formatting FFat...");
    FFat.format(); // Optional: Format FFat (use only if needed)
  } else {
    Serial.println("Failed to initialize FFat!");
    return; // Stop further execution if FFat initialization fails
  }

  // Start FTP server
  ftpServer.begin("user", "password"); // Set FTP username and password
  Serial.println("FTP server started!");
  Serial.println("You can now access the FFat file system via FTP.");
}

void loop() {
  // Handle FTP server requests
  ftpServer.handleFTP(); // Continuously process FTP requests
}

FTP Server on ESP32 and SD card

Here is a little sketch to manage the SD card FTP Server with ESP32

To put on work you must change configuration like so.

#ifndef DEFAULT_FTP_SERVER_NETWORK_TYPE_ESP32
	#define DEFAULT_FTP_SERVER_NETWORK_TYPE_ESP32 		NETWORK_ESP32
	#define DEFAULT_STORAGE_TYPE_ESP32 					STORAGE_SD
#endif

And here the code.

/*
 * Simple FTP Server Example with SD Card on ESP32
 *
 * AUTHOR: Renzo Mischianti
 * URL: https://www.mischianti.org
 *
 * DESCRIPTION:
 * This example demonstrates how to use the MultiFTPServer library
 * with an ESP32 and an SD card module. The ESP32 connects to a WiFi network
 * and initializes an FTP server for file transfers.
 *
 * FEATURES:
 * - WiFi connection to local network
 * - SD card initialization for file storage
 * - FTP server setup for file uploads and downloads
 */

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

// WiFi credentials
const char* WIFI_SSID = "<YOUR-SSID>";    // Replace with your WiFi SSID
const char* WIFI_PASSWORD = "<YOUR-PASSWD>";     // Replace with your WiFi password

// SD card chip select pin
const int CHIP_SELECT_PIN = SS;               // Default SS pin for SPI

// FTP server instance
FtpServer ftpServer;

void setup() {
  // Initialize Serial Monitor
  Serial.begin(9600);
  while (!Serial) {
    // Wait for serial port to connect (required for native USB ports)
  }

  // Connect to WiFi network
  Serial.println("Connecting to WiFi...");
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected!");
  Serial.printf("Connected to: %s\n", WIFI_SSID);
  Serial.printf("IP Address: %s\n", WiFi.localIP().toString().c_str());

  // Wait for a short delay before initializing SD card
  delay(1000);

  // Initialize SD card
  Serial.print("Initializing SD card...");
  while (!SD.begin(CHIP_SELECT_PIN)) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nSD card initialized successfully!");

  // Start FTP server with username and password
  ftpServer.begin("user", "password"); // Replace with your desired FTP credentials
  Serial.println("FTP server started!");
}

void loop() {
  // Handle FTP server operations
  ftpServer.handleFTP(); // Continuously process FTP requests
}

Add a status callback to your FTP Server

The library offer the opportunity to add some callback to check the state of connection or transfer.

The signs of the functions are:

  void (*_callback)(FtpOperation ftpOperation, unsigned int freeSpace, unsigned int totalSpace){};
  void (*_transferCallback)(FtpTransferOperation ftpOperation, const char* name, unsigned int transferredSize){};

Main callback

The first is called when one of these operation is executed:

FTP_CONNECT: a connection is established;
FTP_DISCONNECT: client is disconnected;
FTP_FREE_SPACE_CHANGE: free space is changed.

The other parameters are:

freeSpace: space available on SD;
totalSpace: total space of SD.

Transfer callback

The second one when these operation are executed:

FTP_UPLOAD_START: when an upload is started;
FTP_UPLOAD: when an upload is in course;
FTP_DOWNLOAD_START: when download is started;
FTP_DOWNLOAD: when a download is in course;
FTP_DOWNLOAD_STOP or FTP_TRANSFER_STOP: when download is finished;
FTP_UPLOAD_STOP or FTP_TRANSFER_STOP: when upload is finished;
FTP_DOWNLOAD_ERROR or FTP_TRANSFER_ERROR: when a download error is occured;
FTP_UPLOAD_ERROR or FTP_TRANSFER_ERROR: when an upload error is occured.

The other parameters are:

name: the name of the file;
transferredSize: the size transferred.

Example sketch with callback

The resulting code with callbacks can be:

/*
 * FtpServer with ESP32 and FFat File System
 *
 * AUTHOR: Renzo Mischianti
 *
 * This code sets up an FTP server on an ESP32 using the FFat file system.
 * The server provides basic FTP functionalities, such as uploading and downloading files,
 * with callback functions to monitor connection and transfer events.
 *
 * For detailed information, visit:
 * https://www.mischianti.org/2020/02/08/ftp-server-on-esp8266-and-esp32
 */

#include "FS.h"
#include "FFat.h"
#include <WiFi.h>
#include <MultiFTPServer.h>

// WiFi credentials
const char* ssid = "reef-casa-sopra";
const char* password = "aabbccdd77";

// FTP server instance
FtpServer ftpSrv;

/**
 * Callback function for FTP operations.
 * Provides status updates for FTP connection events.
 */
void ftpOperationCallback(FtpOperation ftpOperation, unsigned int freeSpace, unsigned int totalSpace) {
  switch (ftpOperation) {
    case FTP_CONNECT:
      Serial.println(F("FTP: Client connected!"));
      break;
    case FTP_DISCONNECT:
      Serial.println(F("FTP: Client disconnected!"));
      break;
    case FTP_FREE_SPACE_CHANGE:
      Serial.printf("FTP: Free space changed. Free: %u bytes, Total: %u bytes.\n", freeSpace, totalSpace);
      break;
    default:
      break;
  }
}

/**
 * Callback function for FTP transfers.
 * Provides status updates for file upload and download events.
 */
void ftpTransferCallback(FtpTransferOperation ftpOperation, const char* fileName, unsigned int transferredSize) {
  switch (ftpOperation) {
    case FTP_UPLOAD_START:
      Serial.printf("FTP: Started uploading file: %s\n", fileName);
      break;
    case FTP_UPLOAD:
      Serial.printf("FTP: Uploading file: %s, Transferred: %u bytes\n", fileName, transferredSize);
      break;
    case FTP_DOWNLOAD_START:
      Serial.printf("FTP: Started downloading file: %s\n", fileName);
      break;
    case FTP_DOWNLOAD:
      Serial.printf("FTP: Downloading file: %s, Transferred: %u bytes\n", fileName, transferredSize);
      break;
    case FTP_TRANSFER_STOP:
      Serial.println(F("FTP: Transfer completed successfully."));
      break;
    case FTP_TRANSFER_ERROR:
      Serial.println(F("FTP: Error during file transfer!"));
      break;
    default:
      break;
  }
}

void setup() {
  // Initialize serial communication
  Serial.begin(115200);

  // Connect to WiFi
  Serial.println(F("Connecting to WiFi..."));
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected!");
  Serial.print(F("IP Address: "));
  Serial.println(WiFi.localIP());

  // Initialize FFat file system
  Serial.print(F("Initializing FFat filesystem..."));
  if (FFat.begin(true)) {
    Serial.println(F("done."));
  } else {
    Serial.println(F("failed! Please check FFat setup."));
    while (true) { delay(1000); }
  }

  // Set FTP server callbacks
  ftpSrv.setCallback(ftpOperationCallback);
  ftpSrv.setTransferCallback(ftpTransferCallback);

  // Start FTP server with username and password
  Serial.println(F("Starting FTP server..."));
  ftpSrv.begin("user", "password"); // Username: "user", Password: "password"
}

void loop() {
  // Handle FTP server operations
  ftpSrv.handleFTP();
}

Here the serial output of upload a file and delete 2 files:

Connecting to WiFi...
.....
WiFi connected!
IP Address: 192.168.1.57
Initializing FFat filesystem...done.
Starting FTP server...
FTP: Client connected!
FTP: Started uploading file: api-82.jar
FTP: Uploading file: api-82.jar, Transferred: 1024 bytes
FTP: Uploading file: api-82.jar, Transferred: 2048 bytes
FTP: Uploading file: api-82.jar, Transferred: 3072 bytes
FTP: Uploading file: api-82.jar, Transferred: 4096 bytes
FTP: Uploading file: api-82.jar, Transferred: 5120 bytes
FTP: Uploading file: api-82.jar, Transferred: 6144 bytes
FTP: Uploading file: api-82.jar, Transferred: 7168 bytes
FTP: Uploading file: api-82.jar, Transferred: 8192 bytes
FTP: Uploading file: api-82.jar, Transferred: 9216 bytes
FTP: Uploading file: api-82.jar, Transferred: 10240 bytes
FTP: Uploading file: api-82.jar, Transferred: 11264 bytes
FTP: Uploading file: api-82.jar, Transferred: 12288 bytes
FTP: Uploading file: api-82.jar, Transferred: 13312 bytes
FTP: Uploading file: api-82.jar, Transferred: 14336 bytes
FTP: Uploading file: api-82.jar, Transferred: 15360 bytes
FTP: Uploading file: api-82.jar, Transferred: 16384 bytes
FTP: Uploading file: api-82.jar, Transferred: 17408 bytes
FTP: Uploading file: api-82.jar, Transferred: 18432 bytes
FTP: Uploading file: api-82.jar, Transferred: 19456 bytes
FTP: Uploading file: api-82.jar, Transferred: 20480 bytes
FTP: Uploading file: api-82.jar, Transferred: 21504 bytes
FTP: Uploading file: api-82.jar, Transferred: 22528 bytes
FTP: Uploading file: api-82.jar, Transferred: 23552 bytes
FTP: Uploading file: api-82.jar, Transferred: 24576 bytes
FTP: Uploading file: api-82.jar, Transferred: 25478 bytes
FTP: Transfer completed successfully. 
FTP: Free space changed. Free: 1261568 bytes, Total: 10240000 bytes.
FTP: Free space changed. Free: 3510272 bytes, Total: 10240000 bytes.
FTP: Free space changed. Free: 10211328 bytes, Total: 10240000 bytes.

We are going to analize the output:

line 7: identify the connection of the client;
from 8 to 35: at line 8, start upload transfer from 8 to 33, transfer in the course at line 34, finish transfer;
line 37 and 38: free space changed by delete file;

Supported Platforms

The MultiFTPServer library supports the following platforms:

Platform	Network Type	Default Storage
ESP8266	WiFi, Ethernet	SPIFFS, SPIflash, LittleFS and SD
ESP32	WiFi, Ethernet	SPIFFS, SPI Flash, LittleFS, FFat and SD
Arduino	Ethernet, WiFiNINA, WiFi, External WiFi	SD, SPI Flash, SdFat1 and SdFat2
STM32	Ethernet, External WiFi	SPI Flash, SdFat2
Raspberry Pi Pico	Ethernet, WiFi (RP2040) and External WiFi	LittleFS, SPI Flash, SdFat2 and SD

Configure client

When you configure your client, pay attention to the “Maximun number of connections:” that must be the same as the number specified in the library.

I use FileZilla as client, you can download It here, It quite simple to use and configure.

Filezilla configuration for access esp8266, select plain FTP on Manage Site

First you must go on Manage site --> New site and now set this parameter:

Select FTP as protocol;
Select Use plain FTP (insecure);
Set you login and password (you choice that in sketch);
Than on Trasfer settings select Maximun number of connection equal 1;
Now connect to your device.

Filezilla configuration for access esp8266, select max num connections

If you want to transfer big file, you must extend timeout time.

Thanks

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