feat: option to automatically power off radio after inactivity (#3414)

radio/src/edgetx.cpp

@@ -40,6 +40,7 @@
 #include "switches.h"
 #include "inactivity_timer.h"
 #include "input_mapping.h"
+#include "trainer.h"
 
 #include "tasks.h"
 #include "tasks/mixer_task.h"
@@ -1648,6 +1649,25 @@ uint32_t pwrPressedDuration()
 inline tmr10ms_t getTicks() { return g_tmr10ms; }
 #endif
 
+bool pwrOffDueToInactivity()
+{
+  uint8_t inactivityLimit = g_eeGeneral.pwrOffIfInactive;
+  static tmr10ms_t lastConnectedTime = 0;
+
+  tmr10ms_t currentTime = get_tmr10ms();
+
+  if (TELEMETRY_STREAMING() ||
+      (usbPlugged() && getSelectedUsbMode() != USB_UNSELECTED_MODE) ||
+      isTrainerValid())
+    lastConnectedTime = currentTime;
+
+  bool inactivityShutdown =
+      inactivityLimit && inactivity.counter > 60u * inactivityLimit &&
+      (currentTime - lastConnectedTime) / 100u > 60u * inactivityLimit;
+
+  return inactivityShutdown;
+}
+
 uint32_t pwrCheck()
 {
   const char * message = nullptr;
@@ -1660,11 +1680,14 @@ uint32_t pwrCheck()
 
   static uint8_t pwr_check_state = PWR_CHECK_ON;
 
+  bool inactivityShutdown = pwrOffDueToInactivity();
+  
   if (pwr_check_state == PWR_CHECK_OFF) {
     return e_power_off;
   }
-  else if (pwrPressed()) {
-    inactivityTimerReset(ActivitySource::Keys);
+  else if (pwrPressed() || inactivityShutdown) {
+    if (!inactivityShutdown)
+      inactivityTimerReset(ActivitySource::Keys);
 
     if (TELEMETRY_STREAMING()) {
       message = STR_MODEL_STILL_POWERED;