typedef unsigned char byte;


class Comm
{
public:
    enum CommStatus {
        COMM_ERR  = 0,
        COMM_OK   = 1,
        COMM_NULL = 2
    };
    
    int fd;
    
    CommStatus open();
    CommStatus send(const byte *const data, const unsigned len);
    CommStatus recvbyte(byte *const data);
    CommStatus recv(byte* data, int size);
    
     Comm() : fd(-1) {}
    ~Comm() { if (fd != -1) close(fd); fd = -1; }
};