Introduction

#include "mbed.h"
#include "USBHostMSD.h"
#include "LM75B.h"
#include "EthernetInterface.h"
#include "NTPClient.h"
#include "SimpleSMTPClient.h"
#include "TextLCD.h"

#define DOMAIN "comcast.net"
#define SERVER "smtp.comcast.net"
#define PORT "587" //25 or 587,465(OutBound Port25 Blocking )
#define USER "username"
#define PWD "password"
#define FROM_ADDRESS "username@comcast.net"

DigitalOut led(LED1);
LM75B tmp(p28,p27);

// TO_ADDRESS (Of some address is possible.)
// to-user1@domain, to-user2@domain, to-user3@domain ....
// The TO_ADDRESS are less than 128 characters.
#define TO_ADDRESS "username@comcast.net" 

#define SUBJECT "Sensor Data in USB"

TextLCD lcd(p24, p26, p27, p28, p29, p30);

void msd_task(void const *) {
    USBHostMSD msd("usb");
    int i = 0;
    static long filesize;
    static long last_filesize = 0;
    #define MAX_FILESIZE 1000000L
   while(1) {
        
        // try to connect a MSD device
        while(!msd.connect()) {
            Thread::wait(500);
            printf("waiting\n");
        }
        
        // in a loop, append a file
        // if the device is disconnected, we try to connect it again
        while(1) {
            
            // append a file
            // Check Last file size before appending
            if( last_filesize >= MAX_FILESIZE )
            {
                FILE * fp = fopen("/usb/text1.txt", "w"); // Create of make sure it is new. 
            }
            else
            {
                FILE * fp = fopen("/usb/text1.txt", "a");
            }
            // Get current file size
            FILE * fp = fopen("/usb/text1.txt", "a");
            fseek(fp,0,SEEK_END);
            filesize=ftell(fp);
            printf("the file's length is %1dB\n",filesize);*/
        
            if (fp != NULL) {
                fprintf(fp, "Hello fun SD Card World: %d!\r\n", i++);
                fprintf(fp, "C=%.2f  \tF=%.2f\n",tmp.read(),(1.8)*tmp.read()+32);
                printf("Goodbye World!\r\n");
                fseek(fp,0,SEEK_END);
                filesize=ftell(fp);
                printf("the file's length is %1dB\n",filesize);
                last_filesize = filesize;
                fclose(fp);
            } else {
                printf("FILE == NULL\r\n");
            }
            
            Thread::wait(500);
        
            // if device disconnected, try to connect again
            if (!msd.connected())
                break;
        }
     // }      
    }
}


int main() {
    Thread msdTask(msd_task, NULL, osPriorityNormal, 1024 * 4);
    unsigned char c;
    long length;
    EthernetInterface eth;
    char strTimeMsg[16];
    lcd.cls();
    printf("\n\n/* SimpleMTPClient library demonstration */\n");

    printf("Setting up ...\n");
    eth.init();
    eth.connect();
    printf("Connected OK\r\n");
    
    // IP Address 
    printf("IP Address is %s\r\n", eth.getIPAddress());
    lcd.locate(0,1);
    lcd.printf("%s", eth.getIPAddress());
    
    // NTP Client
    printf("NTP setTime...\r\n");
    NTPClient ntp;
    ntp.setTime("pool.ntp.org");
    
    time_t ctTime = time(NULL)- 25200; // PST
    printf("\nTime is now (PST): %d %s\r\n", ctTime, ctime(&ctTime));
    strftime(strTimeMsg,16,"%y/%m/%d %H:%M",localtime(&ctTime));
    
    lcd.locate(0,0);
    lcd.printf("[%s]",strTimeMsg);
    
    SimpleSMTPClient smtp;
    int ret;
    char msg[]="USB Sensor Data";
    smtp.setFromAddress(FROM_ADDRESS);
    smtp.setToAddress(TO_ADDRESS);
    smtp.setMessage(SUBJECT,msg);
    smtp.addMessage("TEST TEST TEST\r\n");
    FILE * fp = fopen("/usb/text1.txt", "r");
    if(fp==NULL) {
      printf("file not found!\n");
    }
    else 
    {
      fseek(fp,0,SEEK_END);
      length=ftell(fp);
      printf("the file's length is %1dB\n",length);
    }
    fseek(fp,0,SEEK_SET); // Seek back to beginning of ile in case ftell moved the file pointer to the end?
    char *emailtextbuffer = (char*) malloc(sizeof(char)*(length+1)); // Adding one to include the NULL character at the end.
    while (!feof(fp)){                        // while not end of file
           c=fgetc(fp);
           *emailtextbuffer++ = c;      // save char into buffer
           //emailtextbuffer++;
           //printf("Read from file %02x\n\r",c);
    }
    *emailtextbuffer = NULL;
    fclose(fp);
    smtp.addMessage(emailtextbuffer);
    //smtp.addMessage("C=%.2f  \tF=%.2f\n",tmp.read(),(1.8)*tmp.read()+32);
  
    ret = smtp.sendmail(SERVER, USER, PWD, DOMAIN,PORT,SMTP_AUTH_PLAIN);
 
    if (ret) {
        printf("E-mail Transmission Error\r\n");
    } else {
        printf("E-mail Transmission OK\r\n");
    }
   
   
   while(1) {
        led=!led;
        Thread::wait(500);
    }
    free(emailtextbuffer);
}