void get_advance1() {
        system("clear");
        printf("Welcome to advance GET mode, type ? for help.\n");
        printf("get> ");
        scanf("%s", get_adv_val);
        while (get_adv_val != "0" || get_adv_val != "quit"){
        pdu = snmp_pdu_create(SNMP_MSG_GET);
        get_node(get_adv_val, id_oid, &id_len);
        snmp_add_null_var(pdu, id_oid, id_len);
        status = snmp_synch_response(sess_handle, pdu, &response);
        for(vars = response->variables; vars; vars = vars->next_variable)
        print_value(vars->name, vars->name_length, vars);
        printf("get> ");
        scanf("%s", get_adv_val);
        }

}