Post SecureSessionEstablished event when secure session is established (

#34051)

* Post SecureSessionEstablished event when secure session is established

* initialized the node id and fabric index of event data for PASE session

* add local session id to the event data

src/include/platform/CHIPDeviceEvent.h

@@ -250,6 +250,11 @@ enum PublicEventTypes
      * Signals that BLE is deinitialized.
      */
     kBLEDeinitialized,
+
+    /**
+     * Signals that secure session is established.
+     */
+    kSecureSessionEstablished,
 };
 
 /**
@@ -533,6 +538,15 @@ struct ChipDeviceEvent final
         {
             OtaState newState;
         } OtaStateChanged;
+
+        struct
+        {
+            uint64_t PeerNodeId;
+            uint8_t FabricIndex;
+            uint8_t SecureSessionType;
+            uint8_t TransportType;
+            uint16_t LocalSessionId;
+        } SecureSessionEstablished;
     };
 
     bool IsPublic() const { return DeviceEventType::IsPublic(Type); }

src/protocols/secure_channel/PairingSession.cpp

@@ -22,6 +22,9 @@
 #include <lib/core/CHIPConfig.h>
 #include <lib/core/TLVTypes.h>
 #include <lib/support/SafeInt.h>
+#include <lib/support/TypeTraits.h>
+#include <platform/CHIPDeviceEvent.h>
+#include <platform/PlatformManager.h>
 #include <transport/SessionManager.h>
 
 namespace chip {
@@ -78,6 +81,18 @@ void PairingSession::Finish()
     if (err == CHIP_NO_ERROR)
     {
         VerifyOrDie(mSecureSessionHolder);
+        DeviceLayer::ChipDeviceEvent event;
+        event.Type                                   = DeviceLayer::DeviceEventType::kSecureSessionEstablished;
+        event.SecureSessionEstablished.TransportType = to_underlying(address.GetTransportType());
+        event.SecureSessionEstablished.SecureSessionType =
+            to_underlying(mSecureSessionHolder->AsSecureSession()->GetSecureSessionType());
+        event.SecureSessionEstablished.LocalSessionId = mSecureSessionHolder->AsSecureSession()->GetLocalSessionId();
+        event.SecureSessionEstablished.PeerNodeId     = mSecureSessionHolder->GetPeer().GetNodeId();
+        event.SecureSessionEstablished.FabricIndex    = mSecureSessionHolder->GetPeer().GetFabricIndex();
+        if (DeviceLayer::PlatformMgr().PostEvent(&event) != CHIP_NO_ERROR)
+        {
+            ChipLogError(SecureChannel, "Failed to post Secure Session established event");
+        }
         // Make sure to null out mDelegate so we don't send it any other
         // notifications.
         auto * delegate = mDelegate;