TCP conecction with A7 GSM/GPRS/GPS

Hardware Arduino GSM Shield
2

What is wrong with this code for A7 Elecrow shield ?

/*

  • Created by Island
  • Modified by keen
  • Date: 17/03/2017
    */
    #define S1debug true
    #define S_debug true

void setup()
{
Serial1.begin(115200); // the GPRS baud rate
Serial.begin(115200); // the GPRS baud rate

}

void loop()
{
/*

  • After start up the program, you can using terminal to connect the serial of gprs shield,
  • If you input 't' in the terminal, the program will execute SendTextMessage(), it will show how to send a sms message,
  • If input 'd' in the terminal, it will execute DialVoiceCall(), etc.
    */
    delay(500);
    if (Serial.available()){
    switch(Serial.read()){
    case 't':
    SendTextMessage();
    break;
    case 'd':
    DialVoiceCall();
    break;
    case 'h':
    SubmitHttpRequest();
    break;
    case 'q':
    GetSignalQuality();
    break;
    }
    }
    RecData();
    }

/*

  • SendTextMessage()
  • This function is to send a sms message
    */
    void SendTextMessage()
    {
    SendData("",2000,S1debug);
    SendData("AT+CMGF=1",2000,S1debug);//Because we want to send the SMS in text mode
    delay(100);
    SendData("AT+CMGS=+46706015317",2000,S1debug);//send sms message, be careful need to add a country code before the cellphone number
    delay(100);
    SendData("GSM test message!",2000,S1debug);//the content of the message
    delay(100);
    Serial1.println((char)26);//the ASCII code of the ctrl+z is 26
    delay(100);
    }

/*

  • DialVoiceCall
  • This function is to dial a voice call
    */
    void DialVoiceCall()
    {
    SendData("AT+SNFS=0",2000,S1debug);
    delay(100);
    SendData("ATD+86137xxxxxx",2000,S1debug);// "ATD+86137xxxxxxxx"dial the number
    delay(100);
    }

/*

  • SubmitHttpRequest()
  • This function is submit a HTTP request
  • attention:the time of delay is very important, it must be set enough
    */
    void SubmitHttpRequest(){
    SendData("AT+CREG?",1000,S1debug); //Query network registration
    delay(100);

SendData("AT+CGATT=1",2000,S1debug);
delay(100);

SendData("AT+CGDCONT=1,"IP","CMNET"",2000,S1debug);//setting PDP parameter
delay(100);

SendData("AT+CGACT=1,1",2000,S1debug); //Activate PDP, open Internet service
delay(100);

SendData("AT+CIPSTART="TCP","www.baidu.com",80",5000,S1debug); //Establish TCP connection
delay(100);

SendData("AT+CIPSEND=10,"asdfg12345"",2000,S1debug); //Send string "asdfg12345" and the length of string is 10
delay(100);

SendData("AT+CIPCLOSE",2000,S1debug); //Close TCP
delay(100);
}

void GetSignalQuality(){
Serial_Print("Getting the sinal quality...",S_debug);
SendData("AT+CSQ",1000,S1debug);
Serial_Print("Tips:+CSQ: XX,QQ : It means the Signal Quality poorly when the XX less then 10!",S_debug);
}

void SendData(String command, const int timeout, boolean debug){
String response = "";
Serial1.println(command);
delay(5);
if(debug){
long int time = millis();
while( (time+timeout) > millis()){
while(Serial1.available()){
response += char(Serial1.read());
}
}
Serial.print(response);
}
}

void Serial_Print(String data, boolean debug){
if(debug){
Serial.println(data);
}
}

void RecData(){
String response = "";
while(Serial1.available()){
response += char(Serial1.read());
}
Serial.print(response);
}