MediaCupPacket1_3
Version 1.3

I) Changes 
to 1.2: state is now 1 byte
to 1.1: packet end byte: 192


II) packet format

[0]  syncronizing character 0, at least 1x
 l   length of packet, including this byte, without sync and CRC
 a1  4 adress bytes IPv4 / only a1 is used by WebVis 
 a2
 a3
 a4
 [ ... data bytes]
 CRC checksum
 192 end byte

III) Escaping
The len byte does not consider extra byte from the escaping function 

Escaping:

The following characters are escaped:
0   with 219,1
219 with 219,220
192 with 219,193


IV) CRC-Algorithm:

CRC-calculation including the l byte. CRC-calculation takes place before escaping

CRC8 must be preset to 0.

unsigned int crc_bestimmen( unsigned int wert)
{
unsigned int i, f;

  for (i = 0; i < 8; ++i)
  {
        f = (wert ^ CRC8) & 1;
        CRC8 >>= 1;
        wert >>= 1;
        if (f) CRC8 ^= 0x8c;
  }
  return CRC8;
}


V) Data format

Set of 2 or 3 byte packets, depending of the data that should be send. Lo byte is first with 2 byte 
data.

Description		    Bytecode	followed by data:
#define temp_data               1      // 2 Byte data, signed short int
#define temp_data_b	        2      // 1 Byte data, signed char
#define accel_actual 	       10      // 2 Byte data, V1.2, not V1.3 Cup
#define accel_avg 	       11      // 2 Byte data, V1.2, not V1.3 Cup 
#define accel_max              12      // 2 Byte data, V1.2, not V1.3 Cup
#define accel_min              13      // 2 Byte data, V1.2, not V1.3 Cup
#define accel_delta	       14      // 2 Byte data, V1.2, not V1.3 Cup
#define accel_sum	       15      // 2 Byte data, V1.2, not V1.3 Cup
#define state		       16      // 1 Byte data, unsigned char
#define accel_delta_b	       17      // 1 Byte data, V1.2, not V1.3 Cup
#define accel_actual_b         18      // 1 Byte data, V1.2, not V1.3 Cup
#define switch                 20      // 1 Byte data, unsigned char

temp_data  : value in Grad Celsius *10
temp_data_b: value in Grad Celsius
state     :
     #define desk          1
     #define drink         2
     #define play          3
     #define dont know     4

switch     : Meaning (Bit set means switch closed)
    Bit 7  : bottom switch
    Bit 6-3: reserved
    Bit 2  : inclination switch near IR diode 
    Bit 1  : inclination switch near Pic
    Bit 0  : inclination switch near power switch