scan方法支持在不添加任何过滤器时，返回扫描到的所有蓝牙设备

components/ble/nrf_ble_scan/nrf_ble_scan.c

@@ -916,7 +916,7 @@ static void nrf_ble_scan_on_adv_report(nrf_ble_scan_t           const * const p_
 #endif
 
     scan_evt.params.filter_match.p_adv_report = p_adv_report;
-
+    if(filter_cnt==0)is_filter_matched= true;
     // In the multifilter mode, the number of the active filters must equal the number of the filters matched to generate the notification.
     if (all_filter_mode && (filter_match_cnt == filter_cnt))
     {