BLE: Add callback for scan started and stoped.

connectivity/FEATURE_BLE/source/cordio/source/PalGapImpl.cpp

@@ -683,16 +683,34 @@ void PalGap::gap_handler(const wsfMsgHdr_t *msg)
         }   break;
 #endif //  BLE_FEATURE_EXTENDED_ADVERTISING && BLE_ROLE_BROADCASTER
 
-#if BLE_FEATURE_EXTENDED_ADVERTISING && BLE_ROLE_OBSERVER
-        case DM_EXT_SCAN_STOP_IND: {
-            if (!handler) {
+#if BLE_ROLE_OBSERVER
+        case DM_SCAN_START_IND:
+            if (!handler) { break; }
+            handler->on_scan_started(msg->status == HCI_SUCCESS);
             break;
-            }
 
-            //const hciLeScanTimeoutEvt_t *evt = (const hciLeScanTimeoutEvt_t *) msg;
+        case DM_SCAN_STOP_IND:
+            if (!handler) { break; }
+            handler->on_scan_stopped(msg->status == HCI_SUCCESS);
+            break;
+
+#if BLE_FEATURE_EXTENDED_ADVERTISING
+        case DM_EXT_SCAN_START_IND:
+            if (!handler) { break; }
+            handler->on_scan_started(msg->status == HCI_SUCCESS);
+            break;
+
+        case DM_EXT_SCAN_STOP_IND: {
+            if (!handler) { break; }
+
+            if (get_gap().ext_scan_stopping) {
+                get_gap().ext_scan_stopping = false;
+                handler->on_scan_stopped(msg->status == HCI_SUCCESS);
+            } else {
                 handler->on_scan_timeout();
             }
-            break;
+
+        }   break;
 
         case DM_EXT_SCAN_REPORT_IND: {
             if (!handler) {
@@ -718,9 +736,9 @@ void PalGap::gap_handler(const wsfMsgHdr_t *msg)
                 evt->len,
                 evt->pData
             );
-        }
-            break;
-#endif // BLE_FEATURE_EXTENDED_ADVERTISING && BLE_ROLE_OBSERVER
+        }   break;
+#endif // BLE_FEATURE_EXTENDED_ADVERTISING
+#endif // BLE_ROLE_OBSERVER
 
 #if BLE_ROLE_CENTRAL || BLE_ROLE_PERIPHERAL
         case DM_REM_CONN_PARAM_REQ_IND: {
@@ -1243,6 +1261,7 @@ ble_error_t PalGap::extended_scan_enable(
     if (enable) {
         uint32_t duration_ms = duration * 10;
 
+
         DmScanStart(
             scanning_phys.value(),
             DM_DISC_MODE_NONE,
@@ -1253,6 +1272,7 @@ ble_error_t PalGap::extended_scan_enable(
         );
     } else {
         DmScanStop();
+        ext_scan_stopping = true;
     }
 
     return BLE_ERROR_NONE;

connectivity/FEATURE_BLE/source/cordio/source/PalGapImpl.h

@@ -535,6 +535,7 @@ private:
     uint8_t extended_scan_type[3];
     phy_set_t scanning_phys;
     direct_adv_cb_t direct_adv_cb[DM_NUM_ADV_SETS];
+    bool ext_scan_stopping = false;
 
     /**
      * Callback called when an event is emitted by the LE subsystem.

connectivity/FEATURE_BLE/source/generic/GapImpl.cpp

@@ -1051,6 +1051,14 @@ Gap::GapShutdownCallbackChain_t &Gap::onShutdown()
     return shutdownCallChain;
 }
 
+void Gap::on_scan_started(bool success)
+{
+}
+
+void Gap::on_scan_stopped(bool success)
+{
+}
+
 
 void Gap::on_scan_timeout()
 {

connectivity/FEATURE_BLE/source/generic/GapImpl.h

@@ -525,6 +525,10 @@ private:
         uint16_t supervision_timeout
     ) override;
 
+    void on_scan_started(bool success) override;
+
+    void on_scan_stopped(bool success) override;
+
     void on_scan_timeout() override;
 
     void process_legacy_scan_timeout();

connectivity/FEATURE_BLE/source/pal/PalGap.h

@@ -194,6 +194,17 @@ public:
         sync_handle_t sync_handle
      ) = 0;
 
+    /**
+     * Called when scanning start
+     */
+    virtual void on_scan_started(bool success) = 0;
+
+    /**
+     * Called when scanning stop
+     */
+    virtual void on_scan_stopped(bool success) = 0;
+
+
     /** Called when scanning times out.
      */
     virtual void on_scan_timeout( ) = 0;