爲什麼TCP連接在使用AT命令從Adruino GPRS連接到xively時保持關閉狀態？

我試圖使用AT命令將蜂窩連接的arduino溫度傳感器的數據發送到xively.com。我可以打開TCP連接，但它會立即關閉。 爲什麼TCP連接繼續關閉？爲什麼TCP連接在使用AT命令從Adruino GPRS連接到xively時保持關閉狀態？

設置：的Arduino UNO mackbook seeedstudio GPRS V2.0 ATT gophone SIM卡

這裏是我的終端讀出：

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

我的設置： SEEEDStudio GPRS屏蔽 Arduino的烏諾 macbook

發送AT命令S到sheild，我已經設置了一個串行中繼使用以下代碼：

//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 
}

我然後輸入命令和監視與CoolTerm串行通信。

來源

2014-09-03 Goodword

這個工作對我來說：

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

來源

2014-09-09 05:19:09

你能夠保持TCP連接開放？ – Goodword 2014-10-29 13:28:24

只要我記得，我能夠保持連接打開，但肯定不會永遠:)。 – 2014-10-30 13:34:48

爲什麼TCP連接在使用AT命令從Adruino GPRS連接到xively時保持關閉狀態？

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