Refactor listening mode handling and wake word detection configuration

- Replace direct mode setting logic with a new GetDefaultListeningMode method for improved clarity and maintainability.
- Update HandleToggleChatEvent, HandleWakeWordDetectedEvent, and ContinueWakeWordInvoke to utilize the new method for determining listening mode.
- Introduce Kconfig option WAKE_WORD_DETECTION_IN_LISTENING to enable or disable wake word detection during listening mode, enhancing configurability.

main/Kconfig.projbuild

@@ -680,6 +680,16 @@ config SEND_WAKE_WORD_DATA
     help
         Send wake word data to the server as the first message of the conversation and wait for response
 
+config WAKE_WORD_DETECTION_IN_LISTENING
+    bool "Enable Wake Word Detection in Listening Mode"
+    default n
+    depends on USE_AFE_WAKE_WORD || USE_CUSTOM_WAKE_WORD
+    help
+        Enable wake word detection while in listening mode.
+        When enabled, the device can detect wake word during listening,
+        which allows interrupting the current conversation.
+        When disabled (default), wake word detection is turned off during listening.
+
 config USE_AUDIO_PROCESSOR
     bool "Enable Audio Noise Reduction"
     default y

main/application.cc

@@ -691,7 +691,7 @@ void Application::HandleToggleChatEvent() {
     }
 
     if (state == kDeviceStateIdle) {
-        ListeningMode mode = aec_mode_ == kAecOff ? kListeningModeAutoStop : kListeningModeRealtime;
+        ListeningMode mode = GetDefaultListeningMode();
         if (!protocol_->IsAudioChannelOpened()) {
             SetDeviceState(kDeviceStateConnecting);
             // Schedule to let the state change be processed first (UI update)
@@ -801,8 +801,7 @@ void Application::HandleWakeWordDetectedEvent() {
         while (audio_service_.PopPacketFromSendQueue());
 
         if (state == kDeviceStateListening) {
-            auto mode = aec_mode_ == kAecOff ? kListeningModeAutoStop : kListeningModeRealtime;
-            protocol_->SendStartListening(mode);
+            protocol_->SendStartListening(GetDefaultListeningMode());
             audio_service_.ResetDecoder();
             audio_service_.PlaySound(Lang::Sounds::OGG_POPUP);
             // Re-enable wake word detection as it was stopped by the detection itself
@@ -810,7 +809,7 @@ void Application::HandleWakeWordDetectedEvent() {
         } else {
             // Play popup sound and start listening again
             play_popup_on_listening_ = true;
-            SetListeningMode(aec_mode_ == kAecOff ? kListeningModeAutoStop : kListeningModeRealtime);
+            SetListeningMode(GetDefaultListeningMode());
         }
     } else if (state == kDeviceStateActivating) {
         // Restart the activation check if the wake word is detected during activation
@@ -842,12 +841,12 @@ void Application::ContinueWakeWordInvoke(const std::string& wake_word) {
 
     // Set flag to play popup sound after state changes to listening
     play_popup_on_listening_ = true;
-    SetListeningMode(aec_mode_ == kAecOff ? kListeningModeAutoStop : kListeningModeRealtime);
+    SetListeningMode(GetDefaultListeningMode());
 #else
     // Set flag to play popup sound after state changes to listening
     // (PlaySound here would be cleared by ResetDecoder in EnableVoiceProcessing)
     play_popup_on_listening_ = true;
-    SetListeningMode(aec_mode_ == kAecOff ? kListeningModeAutoStop : kListeningModeRealtime);
+    SetListeningMode(GetDefaultListeningMode());
 #endif
 }
 
@@ -891,11 +890,13 @@ void Application::HandleStateChangedEvent() {
                 audio_service_.EnableVoiceProcessing(true);
             }
 
-            // TODO: Should use a Kconfig option to enable/disable wake word detection in listening mode
-            if (true) {
-                // Always ensure wake word detection state in listening
-                audio_service_.EnableWakeWordDetection(audio_service_.IsAfeWakeWord());
-            }
+#ifdef CONFIG_WAKE_WORD_DETECTION_IN_LISTENING
+            // Enable wake word detection in listening mode (configured via Kconfig)
+            audio_service_.EnableWakeWordDetection(audio_service_.IsAfeWakeWord());
+#else
+            // Disable wake word detection in listening mode
+            audio_service_.EnableWakeWordDetection(false);
+#endif
             
             // Play popup sound after ResetDecoder (in EnableVoiceProcessing) has been called
             if (play_popup_on_listening_) {
@@ -944,6 +945,10 @@ void Application::SetListeningMode(ListeningMode mode) {
     SetDeviceState(kDeviceStateListening);
 }
 
+ListeningMode Application::GetDefaultListeningMode() const {
+    return aec_mode_ == kAecOff ? kListeningModeAutoStop : kListeningModeRealtime;
+}
+
 void Application::Reboot() {
     ESP_LOGI(TAG, "Rebooting...");
     // Disconnect the audio channel

main/application.h

@@ -165,6 +165,7 @@ private:
     void InitializeProtocol();
     void ShowActivationCode(const std::string& code, const std::string& message);
     void SetListeningMode(ListeningMode mode);
+    ListeningMode GetDefaultListeningMode() const;
     
     // State change handler called by state machine
     void OnStateChanged(DeviceState old_state, DeviceState new_state);