Added powersaving to all ESP32 boards with RTC-supported DIO1

Added CLI to enable/disable powersaving

src/helpers/ESP32Board.h

@@ -8,6 +8,8 @@
 #include <rom/rtc.h>
 #include <sys/time.h>
 #include <Wire.h>
+#include <WiFi.h>
+#include "driver/rtc_io.h"
 
 class ESP32Board : public mesh::MainBoard {
 protected:
@@ -47,6 +49,27 @@ public:
     return temperatureRead();
   }
 
+  void enterLightSleep(uint32_t secs) {
+#if defined(CONFIG_IDF_TARGET_ESP32S3) // Supported ESP32 variants
+    if (rtc_gpio_is_valid_gpio((gpio_num_t)P_LORA_DIO_1)) { // Only enter sleep mode if P_LORA_DIO_1 is RTC pin
+      esp_sleep_pd_config(ESP_PD_DOMAIN_RTC_PERIPH, ESP_PD_OPTION_ON);
+      esp_sleep_enable_ext1_wakeup((1L << P_LORA_DIO_1), ESP_EXT1_WAKEUP_ANY_HIGH); // To wake up when receiving a LoRa packet
+
+      if (secs > 0) {
+        esp_sleep_enable_timer_wakeup(secs * 1000000); // To wake up every hour to do periodically jobs
+      }
+
+      esp_light_sleep_start(); // CPU enters light sleep
+    }
+#endif
+  }
+
+  void sleep(uint32_t secs) override {
+    if (WiFi.getMode() == WIFI_MODE_NULL) { // WiFi is off ~ No active OTA, safe to go to sleep
+      enterLightSleep(secs);                // To wake up after "secs" seconds or when receiving a LoRa packet
+    }
+  }
+
   uint8_t getStartupReason() const override { return startup_reason; }
 
 #if defined(P_LORA_TX_LED)