SLCAN_EFF_ID_LEN
cf->len = sl->rbuff[SLCAN_CMD_LEN + SLCAN_EFF_ID_LEN];
sl->rbuff[SLCAN_CMD_LEN + SLCAN_EFF_ID_LEN] = 0;
cmd += SLCAN_CMD_LEN + SLCAN_EFF_ID_LEN + 1;
endpos = pos + SLCAN_EFF_ID_LEN;
SLCAN_EFF_ID_LEN : SLCAN_SFF_ID_LEN;