File content as of revision 0:e35dac7e4c95:

#include "mbed.h"
#include "SDFileSystem.h"
#include "EthernetInterface.h"
#include "FTPClient.h"
#include <string.h>
#include <stdio.h>
#define FTP_SERVER_PORT     21
 static char buf[256];
static char ID[]={"user"};                   //Set FTPServer Login ID
static char PASSWORD[]={"1234"};             //Set FTPServer Login Password
FTPClient FTP(PB_3, PB_2, PB_1, PB_0, "sd"); // WIZwiki-W7500 
Serial pc(USBTX, USBRX);
int main() {
     pc.baud(9600);
    
    pc.printf("------------------------------FTP Client Example-------------------------------------------!\r\n"); 
      
  
    char ftpServer_control_ip_addr[] = "demo.wftpserver.com"; // FTP Server location
    char* userid = "demo-user"; //FTP Server User ID
    char* password = "demo-user"; //FTP Server Password
      EthernetInterface eth;
      uint8_t mac_addr[6] = {0x00, 0x08, 0xdc, 0x12, 0x34, 0x45};
      char IP_Addr[] = "192.168.0.100";
char IP_Subnet[] = "255.255.255.0";
char IP_Gateway[] = "192.168.0.1";
    eth.init(mac_addr, IP_Addr, IP_Subnet, IP_Gateway); //Use Static
    eth.connect();
    pc.printf("The IP address of the client is %s\r\n",eth.getIPAddress());
    
    while(1) {
       char Msg_c = pc.getc();
            
    if(Msg_c==0x31){
               
                    pc.printf("Connecting...FTPServer\r\nIP:%s, PORT:%d\r\n", ftpServer_control_ip_addr, FTP_SERVER_PORT);
                   int n  = FTP.open("demo.wftpserver.com", 21,"demo-user","demo-user");
                    pc.printf("%d\r\n",n);
                     wait(10);
                    printf("The Files and folders available in the server are :\r\n");
                    FTP.ls();
                    printf("\r\n");
                     wait(10);
                    printf("The Files in upload folder are :\r\n");
                    FTP.cd("/upload");
                    FTP.ls();
                    wait(10);
                    printf("The Files in download folder are :\r\n");
                    FTP.cd("/download");
                    FTP.ls();
                    printf("\r\n");
                   wait(10);
                     
            }    

             
     }    
            

}