从传感器到Arduino Mega 2560的XBee数据没有改变+错误

Question

我试图通过XBee S2获取传感器值到另一个连接到Arduino Mega 2560的XBee S2并将数据发送到Web服务。在这段代码中我发送一个常量数据（10,0,0），但我想发送传感器数据，直到现在我都无法获得。这是代码：

#include <SoftwareSerial.h>
SoftwareSerial gprsSerial(7, 8);
SoftwareSerial xbee(0, 1);

unsigned long int avgValue; //Store the average value of the sensor feedback
float b;
int buf[10], temp;

void setup() {
  gprsSerial.begin(9600);
  Serial.begin(9600);
  xbee.begin(9600);

  Serial.println("Config SIM900...");
  delay(2000);
  Serial.println("Done!...");
  gprsSerial.flush(); //Waits for the transmission of outgoing serial data to complete.

  // Attach or detach from GPRS service
  gprsSerial.println("AT+CGATT=1");
  delay(100);
  toSerial();


  // Bearer settings
  gprsSerial.println("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"");
  delay(2000);
  toSerial();

  // Bearer settings
  gprsSerial.println("AT+SAPBR=3,1,\"APN\",\"zain\"");
  delay(2000);
  toSerial();

  // bearer settings
  gprsSerial.println("AT+SAPBR=1,1");
  delay(2000);
  toSerial();
};

void loop() {
  if (xbee.available() >= 0) {
    for (int i = 1; i < 19; i++) {
      byte discardByte = xbee.read();
    }

    int analogMSB = xbee.read();
    int analogLSB = xbee.read();
    int analogReading = analogLSB + (analogMSB * 256);
    float phValue=(float)analogReading * 5.0 / 1024 / 6; //Convert the analog into millivolt
    phValue=-35.3*phValue;                               //Convert the millivolt into pH value
    Serial.print("    pH:");
    Serial.print(phValue,2);
    Serial.println(" ");

    // Initialize HTTP service
    gprsSerial.println("AT+HTTPINIT");
    delay(2000);
    toSerial();

    // Set HTTP parameter value
    gprsSerial.println("AT+HTTPPARA= \"URL\" ,\"http://ar.ahu.edu.jo/sensor.aspx?Sens1=10&Sens2=0&Sens3=0\"");
    delay(2000);
    toSerial();

    // Set HTTP action type 0 = GET, 1 = POST, 2 = HEAD
    gprsSerial.println("AT+HTTPACTION=0");
    delay(6000);
    toSerial();

    // Read server response
    gprsSerial.println("AT+HTTPREAD");
    delay(1000);
    toSerial();

    gprsSerial.println("");
    gprsSerial.println("AT+HTTPTERM");
    toSerial();
    delay(300);

    gprsSerial.println("");
    delay(10000);
  }
}

void toSerial()
{
  while(gprsSerial.available()!=0)
  {
    Serial.println(gprsSerial.read());
  }
}