为什么在使用AT命令从Adruino GPRS连接到xively时，TCP连接一直关闭

Question

我正试图使用AT命令将数据从蜂窝连接的arduino温度传感器发送到xively.com。我可以打开TCP连接，但它会立即关闭为什么TCP连接一直处于关闭状态

设置：arduino unomackbook参见研究gprs v2.0att-gophone sim卡

这是我的终端读数：

Call Ready
AT
OK
AT+CPIN?
+CPIN: READY
OK
AT+CGATT?
+CGATT: 1
OK
AT+CIPSHUT
SHUT OK
AT+CIPSTATUS
OK
STATE: IP INITIAL
AT+CIPMUX=0
OK
AT+CSTT="wap.cingular"
OK
AT+CIICR
OK
AT+CIFSR
10.52.49.206
AT+CIPSTART="TCP","api.xively.com","80"
OK
STATE: TCP CLOSED

我的设置：SEEEDStudio GPRS屏蔽微控制器macbook

为了向酋长发送AT命令，我使用以下代码设置了一个串行继电器：

//Serial Relay - Arduino will patch a 
//serial link between the computer and the GPRS Shield
//at 19200 bps 8-N-1
//Computer is connected to Hardware UART
//GPRS Shield is connected to the Software UART 
#include <SoftwareSerial.h>
SoftwareSerial GPRS(7, 8);
unsigned char buffer[64]; // buffer array for data recieve over serial port
int count=0;     // counter for buffer array 
void setup()
{
  GPRS.begin(19200);               // the GPRS baud rate   
  Serial.begin(19200);             // the Serial port of Arduino baud rate.
}
void loop()
{
  if (GPRS.available())              // if date is comming from softwareserial port ==> data is comming from gprs shield
  {
    while(GPRS.available())          // reading data into char array 
    {
      buffer[count++]=GPRS.read();     // writing data into array
      if(count == 64)break;
  }
    Serial.write(buffer,count);            // if no data transmission ends, write buffer to hardware serial port
    clearBufferArray();              // call clearBufferArray function to clear the storaged data from the array
    count = 0;                       // set counter of while loop to zero

  }
  if (Serial.available())            // if data is available on hardwareserial port ==> data is comming from PC or notebook
    GPRS.write(Serial.read());       // write it to the GPRS shield
}
void clearBufferArray()              // function to clear buffer array
{
  for (int i=0; i<count;i++)
    { buffer[i]=NULL;}                  // clear all index of array with command NULL
}

然后，我输入命令并监控与CoolTerm的串行通信。

Answer 1

这对我有效：

send AT+CGREG? until you get +CGREG: 0,1
send AT+CGATT? response +CGATT: 1
send AT+CSTT="internet","","" response OK
send AT+CIICR response OK
send AT+CIFSR response IP address
send AT+CIPSTART="TCP","api.xively.com","80" response CONNECT OK