Add buzzer feedback on GPS toggle (#5090)

Triple Press on buttons toggles GPS enable/disable.

This enhancement plays a triple-beep so that users of devices with buzzers can get audible feedback about whether they have turned the GPS off or on. This is especially valuable for screenless devices such as the T1000E where it may not be immediately obvious the GPS has been disabled.

src/buzz/buzz.cpp

@@ -55,6 +55,18 @@ void playBeep()
     playTones(melody, sizeof(melody) / sizeof(ToneDuration));
 }
 
+void playGPSEnableBeep()
+{
+    ToneDuration melody[] = {{NOTE_C3, DURATION_1_8}, {NOTE_FS3, DURATION_1_4}, {NOTE_CS4, DURATION_1_4}};
+    playTones(melody, sizeof(melody) / sizeof(ToneDuration));
+}
+
+void playGPSDisableBeep()
+{
+    ToneDuration melody[] = {{NOTE_CS4, DURATION_1_8}, {NOTE_FS3, DURATION_1_4}, {NOTE_C3, DURATION_1_4}};
+    playTones(melody, sizeof(melody) / sizeof(ToneDuration));
+}
+
 void playStartMelody()
 {
     ToneDuration melody[] = {{NOTE_FS3, DURATION_1_8}, {NOTE_AS3, DURATION_1_8}, {NOTE_CS4, DURATION_1_4}};

src/buzz/buzz.h

@@ -3,3 +3,5 @@
 void playBeep();
 void playStartMelody();
 void playShutdownMelody();
+void playGPSEnableBeep();
+void playGPSDisableBeep();

src/gps/GPS.cpp

@@ -7,6 +7,7 @@
 #include "PowerMon.h"
 #include "RTC.h"
 #include "Throttle.h"
+#include "buzz.h"
 #include "meshUtils.h"
 
 #include "main.h" // pmu_found
@@ -1680,6 +1681,7 @@ void GPS::toggleGpsMode()
     if (config.position.gps_mode == meshtastic_Config_PositionConfig_GpsMode_ENABLED) {
         config.position.gps_mode = meshtastic_Config_PositionConfig_GpsMode_DISABLED;
         LOG_INFO("User toggled GpsMode. Now DISABLED.");
+        playGPSDisableBeep();
 #ifdef GNSS_AIROHA
         if (powerState == GPS_ACTIVE) {
             LOG_DEBUG("User power Off GPS");
@@ -1690,7 +1692,8 @@ void GPS::toggleGpsMode()
     } else if (config.position.gps_mode == meshtastic_Config_PositionConfig_GpsMode_DISABLED) {
         config.position.gps_mode = meshtastic_Config_PositionConfig_GpsMode_ENABLED;
         LOG_INFO("User toggled GpsMode. Now ENABLED");
+        playGPSEnableBeep();
         enable();
     }
 }
-#endif // Exclude GPS
+#endif // Exclude GPS