Find client by handle during disconnect event.

If the peer has RPA enabled, searching by address fails due to address
resolution.
If this occurs, attempt to find the client by connection handle.

Author: gkoh

src/NimBLEClient.cpp

@@ -940,6 +940,11 @@ int NimBLEClient::handleGapEvent(struct ble_gap_event* event, void* arg) {
                 pClient = NimBLEDevice::getClientByPeerAddress(event->disconnect.conn.peer_id_addr);
             }
 
+            // try by connection handle
+            if (pClient == nullptr) {
+                pClient = NimBLEDevice::getClientByHandle(event->disconnect.conn.conn_handle);
+            }
+
             if (pClient == nullptr) {
                 NIMBLE_LOGE(LOG_TAG, "Disconnected client not found, conn_handle=%d",
                             event->disconnect.conn.conn_handle);