xbee経由で受けとった温度データをarduinoが読みとり、Railsに上げる

ConnectRails.ino

#include <Ethernet.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

byte mac[] = { 0x00, 0x50, 0xC2, 0x97, 0x21, 0xBD };
byte ip[] = { 192, 168, 0, 112 };
byte gateway[] = { 192, 168, 0, 1 };
byte subnet[] = { 255, 255, 255, 0 };
byte server[] = { 192, 168, 0, 111 };
byte  buf[30];

//SoftwareSerial mySerial =  SoftwareSerial(rxPin, txPin);
int flg=0;
int strn=0;

Client client(server, 3000);

void setup()
{
  Ethernet.begin(mac, ip, gateway, subnet);
  Serial.begin(9600);
//  pinMode(13,OUTPUT);
//  digitalWrite(13,LOW);
  
  delay(1000);
  Serial.flush();
  Serial.println("connecting...");
}

void loop(){
  int c,buf[200];
  int i,j;
  int imax=20;
  long data;
  
  if(Serial.available()>imax-1){
    i=0;
    do{
      c = Serial.read();
      buf[i] = c;
      i++;
    }while(c != -1);
    i--;
    data = 0;
    for(j=0;j<3;j++){
      data += 256*(3-j) * buf[15+j];
    }
    data += buf[18];
    
    Serial.println(data);
    data_post(data);
//    Serial.flush();
  }

  delay(1000);
}

void data_post(long buf)
{
  char str[100];
  
  if(client.connect()){
    Serial.println("connected");
    
    sprintf(str,"%d",buf);
    
    client.print("GET /push/push?id=");
    client.print(str);
    client.println(" HTTP/1.0");
    client.stop();
  }
  else{
    Serial.println("connection failed");
    client.stop();
  }
  return;
}