cJSON *MAC_arry     = cJSON_GetObjectItem( clientlist, "Maclist");

if( MAC_arry != NULL ){

    int  array_size   = cJSON_GetArraySize ( MAC_arry );

    for( iCnt =  ; iCnt < array_size ; iCnt ++ ){

        cJSON * pSub = cJSON_GetArrayItem(MAC_arry, iCnt);

        if(NULL == pSub ){ continue ; }

        char * ivalue = pSub->valuestring ;

        printf("Maclist[%d] : %s",iCnt,ivalue);

    }

}