#include <SoftwareSerial.h>

// long data receive
 // fixed data size = 32bytes
 // 2014.6.29
 // created by ERMINE Corp.
 //


const long originatorID = 0x04002E02;  // このマグネットセンサ固体のID

 const byte u8CRC8Table[256] = { 
 0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15, 
 0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d, 
 0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65, 
 0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d, 
 0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5, 
 0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd, 
 0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85, 
 0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd, 
 0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2, 
 0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea, 
 0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2, 
 0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a, 
 0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32, 
 0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a, 
 0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42, 
 0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a, 
 0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c, 
 0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4, 
 0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec, 
 0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4, 
 0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c, 
 0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44, 
 0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c, 
 0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34, 
 0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b, 
 0x76, 0x71, 0x78, 0x7f, 0x6A, 0x6d, 0x64, 0x63, 
 0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b, 
 0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13, 
 0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb, 
 0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8D, 0x84, 0x83, 
 0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb, 
 0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3 
 }; 

 unsigned int data_length = 0;
 byte optional_length = 0;

 byte u8CRC = 0; 

 int i;
 int incomingByte = 0;
 long tempID = 0;
 
 int intCom;
 int intState = 2;  //0 as Close, 1 as open, 2 as non-state
 String strOpenMsg = "{\"message\":\"\",\"msnumber\":1,\"action\":2,\"critical\":0}";
 SoftwareSerial mySerial(7,8);
 

 void setup() {
  Serial.begin(57600);
  mySerial.begin(14400);
  delay(10000);
 }

 void loop(){
  if (Serial.available() > 0){
    incomingByte = Serial.read(); // pick up the first byte of the buffer
    if(incomingByte == 0x55){      // status chaging process
      while(Serial.available() <= 5){}; // fill buffer with header size
      data_length = Serial.read(); // data length(upper)
      incomingByte = Serial.read(); // data length(lower)
      data_length = data_length * 256 + incomingByte; // data length(2bytes)
      optional_length = Serial.read(); // optional length
      incomingByte = Serial.read(); // packet type
      
      if (incomingByte == 0x0A){ // packet type 10:RADIO_ADVANCED
        incomingByte = Serial.read(); // skip CRC
        while(Serial.available() <= (data_length + optional_length)){}; // fill buffer with data size
        incomingByte = Serial.read(); // skip header, must be 0x26
        tempID = 0;    // extract originator ID
        for (int i=0; i<4; i++){ 
          incomingByte = Serial.read();
          tempID = tempID * 256 + incomingByte;
        };
        
        if (tempID == originatorID) {
          for (int i=0; i<(data_length - 6); i++){
            incomingByte = Serial.read();
            intCom = incomingByte;
            if (intCom == 8){
              if(intState != 0){
                mySerial.println(strOpenMsg);
                Serial.println(strOpenMsg);
                intState = 0; 
              }
            }else{
              if(intState != 1){
                intState = 1;
              }
            }
          }
        }
      }
    }
  }
 }