#define SCCRQ 1
#define SCCRP 2
#define SCCCN 3
#define StopCCN 4
#define Hello 6
#define OCRQ 7
#define OCRP 8
#define OCCN 9
#define ICRQ 10
#define ICRP 11
#define ICCN 12
#define CDN 14
#define WEN 15
#define SLI 16
#define MAX_MSG 16
#define TBIT 0x8000
#define LBIT 0x4000
#define RBIT 0x2000
#define FBIT 0x0800