#define EOS_OK                  0
#define EOS_ERR                 -1
#define EOS_ERR_TIMEOUT         -2
#define EOS_ERR_BUSY            -3

#define EOS_ERR_FULL            -10
#define EOS_ERR_EMPTY           -11
#define EOS_ERR_NOTFOUND        -12

#define EOS_ERR_NET             -20

void eos_init(void);