M2M_STATUS_BUF_SHIFT
#define M2M_STATUS_BUF_NO (0 << M2M_STATUS_BUF_SHIFT)
#define M2M_STATUS_BUF_ON (1 << M2M_STATUS_BUF_SHIFT)
#define M2M_STATUS_BUF_NEXT (2 << M2M_STATUS_BUF_SHIFT)
#define M2M_STATUS_BUF_MASK (3 << M2M_STATUS_BUF_SHIFT)