我正在尝试使用 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，但随后它立即关闭。为什么TCP连接总是关闭？
设置：
阿尔杜伊诺乌诺
MacBook
Seed Studio GPRS v2.0
att 电话 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 扩展板
Arduino Uno
MacBook
为了向扩展板发送 AT 命令，我使用以下代码设置了串行继电器：
//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，我输入命令并使用 CoolTerm 监控串行通信。
这对我有用：
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
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