Arduinoカメラで撮影した画像を3G回線でサーバーにアップロードする監視カメラを作りたい

###前提・実現したいこと
10分毎にカメラで撮影しSDカードに保存、その画像を3G回線で
サーバーにアップロードする監視カメラのような装置を作りたいと考えています。
###発生している問題・エラーメッセージ

・ファイル名は変更されていくが、プログラムを立ち上げて一ループ目にに撮影した画像をアップロードし続ける。

・長い時間ループを回すとhttpPOST error1...が出てくる。

・アップロードされた画像にノイズが入る。

###該当のソースコード

// This is a basic snapshot sketch using the VC0706 library.
// On start, the Arduino will find the camera and SD card and
// then snap a photo, saving it to the SD card.
// Public domain.

// If using an Arduino Mega (1280, 2560 or ADK) in conjunction
// with an SD card shield designed for conventional Arduinos
// (Uno, etc.), it's necessary to edit the library file:
//   libraries/SD/utility/Sd2Card.h
// a non-Mega, Uno-style board.

#include <Adafruit_VC0706.h>
#include <SPI.h>
#include <SD.h>

//3GIM header
#include "a3gim2.h"

// comment out this line if using Arduino V23 or earlier
//#include <SoftwareSerial.h>         

// uncomment this line if using Arduino V23 or earlier
// #include <NewSoftSerial.h>       

// SD card chip select line varies among boards/shields:
// Adafruit SD shields and modules: pin 10
// Arduino Ethernet shield: pin 4
// Sparkfun SD shield: pin 8
// Arduino Mega w/hardware SPI: pin 53
// Teensy 2.0: pin 0
// Teensy++ 2.0: pin 20
#define chipSelect 53

//3GIM
#define BODY_BUFFER 950
char body[BODY_BUFFER]; // バッファ
#define IMGEQ "img="

// POST send parameter
const char *server = "**********.jp"; // サーバ名
const char *path = "*******.php"; // PHPファイル
  
// 送信書式
const char *header = "Content-Type: application/x-www-form-urlencoded";
const int port =  80;
  
int IS=strlen(IMGEQ);
char res[100];

// Pins for camera connection are configurable.
// With the Arduino Uno, etc., most pins can be used, except for
// those already in use for the SD card (10 through 13 plus
// chipSelect, if other than pin 10).
// With the Arduino Mega, the choices are a bit more involved:
// 1) You can still use SoftwareSerial and connect the camera to
//    a variety of pins...BUT the selection is limited.  The TX
//    pin from the camera (RX on the Arduino, and the first
//    argument to SoftwareSerial()) MUST be one of: 62, 63, 64,
//    65, 66, 67, 68, or 69.  If MEGA_SOFT_SPI is set (and using
//    a conventional Arduino SD shield), pins 50, 51, 52 and 53
//    are also available.  The RX pin from the camera (TX on
//    Arduino, second argument to SoftwareSerial()) can be any
//    pin, again excepting those used by the SD card.
// 2) You can use any of the additional three hardware UARTs on
//    the Mega board (labeled as RX1/TX1, RX2/TX2, RX3,TX3),
//    but must specifically use the two pins defined by that
//    UART; they are not configurable.  In this case, pass the
//    desired Serial object (rather than a SoftwareSerial
//    object) to the VC0706 constructor.

// Using SoftwareSerial (Arduino 1.0+) or NewSoftSerial (Arduino 0023 & prior):
#if ARDUINO >= 100
// On Uno: camera TX connected to pin 2, camera RX to pin 3:
SoftwareSerial cameraconnection = SoftwareSerial(69, 3);
// On Mega: camera TX connected to pin 69 (A15), camera RX to pin 3:
//SoftwareSerial cameraconnection = SoftwareSerial(69, 3);
//#else
//NewSoftSerial cameraconnection = NewSoftSerial(2, 3);
#endif

Adafruit_VC0706 cam = Adafruit_VC0706(&cameraconnection);

// Using hardware serial on Mega: camera TX conn. to RX1,
// camera RX to TX1, no SoftwareSerial object is required:
//Adafruit_VC0706 cam = Adafruit_VC0706(&Serial1);

 int file_count = 1;
  char filename[16];


void setup() {

  // When using hardware SPI, the SS pin MUST be set to an
  // output (even if not connected or used).  If left as a
  // floating input w/SPI on, this can cause lockuppage.
#if !defined(SOFTWARE_SPI)
#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
  if(chipSelect != 53) pinMode(53, OUTPUT); // SS on Mega
#else
  if(chipSelect != 10) pinMode(10, OUTPUT); // SS on Uno, etc.
#endif
#endif

  Serial.begin(9600);

  //-------------- 3GSA接続 ------------
  Serial.println("-----------------");
  Serial.println("3gsa ready : Wait about 40 sec...");
  while( !(a3gs.start() == 0 && a3gs.begin()==0))
  {
    Serial.print(".");
    delay(1000);
    }
  Serial.println("3gsa connected");
  Serial.println("-----------------");
  Serial.println("VC0706 Camera snapshot ");
  
 
  // see if the card is present and can be initialized:
  if (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
    // don't do anything more:
    return;
  }  
  
 
  // Try to locate the camera
  if (cam.begin()) {
    Serial.println("Camera Found:");
  } else {
    Serial.println("No camera found?");
    return;
  }
  // Print out the camera version information (optional)
  char *reply = cam.getVersion();
  if (reply == 0) {
    Serial.print("Failed to get version");
  } else {
    Serial.println("-----------------");
    Serial.print(reply);
    Serial.println("-----------------");
  }
  

  // Set the picture size - you can choose one of 640x480, 320x240 or 160x120 
  // Remember that bigger pictures take longer to transmit!
  
  //cam.setImageSize(VC0706_640x480);        // biggest
  cam.setImageSize(VC0706_320x240);        // medium
  //cam.setImageSize(VC0706_160x120);          // small

  // You can read the size back from the camera (optional, but maybe useful?)
  uint8_t imgsize = cam.getImageSize();
  Serial.print("Image size: ");
  if (imgsize == VC0706_640x480) Serial.println("640x480");
  if (imgsize == VC0706_320x240) Serial.println("320x240");
  if (imgsize == VC0706_160x120) Serial.println("160x120");

  Serial.println("Snap in 3 secs...");
  delay(3000);

  
   while(1){//-------------- ループ開始 ------------

  if (! cam.takePicture()) 
    Serial.println("Failed to snap!");
  else 
    Serial.println("Picture taken!");
  

 sprintf(filename, "IMG%02d.JPG", file_count++); 

                    
                    if( file_count > 10){
                      file_count = 1; // Overwrite 
                      }
  
  // Open the file for writing
  File imgFile = SD.open(filename, FILE_WRITE| O_TRUNC);

  // Get the size of the image (frame) taken  
  uint16_t jpglen = cam.frameLength();
  Serial.print("Storing ");
  Serial.print(jpglen, DEC);
  Serial.print(" byte image.");

  int32_t time = millis();
  pinMode(8, OUTPUT);
  // Read all the data up to # bytes!
  byte wCount = 0; // For counting # of writes
  while (jpglen > 0) {
    // read 32 bytes at a time;
    uint8_t *buffer;
    uint8_t bytesToRead = min(32, jpglen); // change 32 to 64 for a speedup but may not work with all setups!
    buffer = cam.readPicture(bytesToRead);
    imgFile.write(buffer, bytesToRead);
    if(++wCount >= 64) { // Every 2K, give a little feedback so it doesn't appear locked up
      Serial.print('.');
      wCount = 0;
    }
    //Serial.print("Read ");  Serial.print(bytesToRead, DEC); Serial.println(" bytes");
    jpglen -= bytesToRead;
  }
  imgFile.close();
  
//------------ SDメモリー読込み3GSA書出し --------------
  File fp = SD.open(filename ,FILE_READ| O_TRUNC);
  int len = sizeof(res);
  int i=strlen(IMGEQ);
  sprintf(body,"%s",IMGEQ);//POST引き渡し変数名設定
  uint8_t b;
  
  while(fp.available()) {//------------読み取り可能なbyteがある場合入る --------------
     b = fp.read();
     body[i++] = b/16 + (b/16>9?'A'-10:'0'); // バイナリ―から文字変換（上位）
     body[i++] = b%16 + (b%16>9?'A'-10:'0'); // バイナリ―から文字変換（下位）
     delay(10); 
     //time = millis() - time;
         if( i>=BODY_BUFFER ) {
               if(a3gs.httpPOST(server,port,path,header,body,res,&len,false)!=0)
                    Serial.println("httpPOST error1...");
                    else Serial.print(".");
               i=strlen(IMGEQ);
               sprintf(body,"%s",IMGEQ); //POST引き渡し変数名設定
                     }
      }
fp.close();

if(i>strlen(IMGEQ)) {
  body[IS +i] = 0x00 ; // 残りバッファの3GSA書出し
  if(a3gs.httpPOST(server,port,path,header,body,res,&len,false)!=0)
     Serial.println("httpPOST error2..."); else Serial.print(".");
      }

  sprintf(body,"img=%s",filename); // ファイル名の書出し（php側でファイル名変更）
  
  if(a3gs.httpPOST(server,port,path,header,body,res,&len,false)!=0){
     Serial.println(" file name send error");
     }else {
      Serial.print(" Completed send '"); Serial.print(filename); Serial.println("' file");
      }
     
  Serial.println("done!");
  Serial.print(time); Serial.println(" ms elapsed");

  cam.reset();

  delay(600000);
  }

}

void loop() {
}

###試したこと
・最初はループ関数の中で、写真撮影→SDに保存→サーバーにpostといった流れで
処理させていましたが、サーバーへのpostが上手くいかないようでhttpPOST error1...となりアップロードできませんでした。

・バッファサイズを半分にしたり大きくしたりと試してみましたが、結果は変わりませんでした。

###補足情報(言語/FW/ツール等のバージョンなど)
・マイコン：Arduino mega2560
・カメラ：TTLシリアルJPEGカメラ
・3Gモジュール：3GIM、3Gシールド