To support lightsleep for Heltec V3/v4 repeater to achieve 9mA power consumption

examples/simple_repeater/main.cpp

@@ -19,6 +19,11 @@ void halt() {
 
 static char command[160];
 
+#ifdef POWERSAVING_MODE
+  unsigned long lastActive = millis();   // mark last active time
+  unsigned long nextSleepinSecs = 120;   // next sleep in seconds. First time is 2m to send advert and do repeater setup.
+#endif
+
 void setup() {
   Serial.begin(115200);
   delay(1000);
@@ -117,4 +122,12 @@ void loop() {
   ui_task.loop();
 #endif
   rtc_clock.tick();
+
+#ifdef POWERSAVING_MODE
+  if (millis() - lastActive > nextSleepinSecs * 1000) {
+    board.sleep(1800); // To sleep. Wake up after 30 minutes or when receiving a LoRa packet
+    lastActive = millis();
+    nextSleepinSecs = 5; // Default: To work for 5s and sleep again
+  }
+#endif
 }

src/MeshCore.h

@@ -47,6 +47,7 @@ class MainBoard {
   virtual void onAfterTransmit() { }
   virtual void reboot() = 0;
   virtual void powerOff() { /* no op */ }
+  virtual void sleep(uint32_t secs)  { /* no op */ }
   virtual uint32_t getGpio() { return 0; }
   virtual void setGpio(uint32_t values) {}
   virtual uint8_t getStartupReason() const = 0;
@@ -86,4 +87,4 @@ class RTCClock {
   }
 };
 
-}
+}

src/helpers/ESP32Board.h

@@ -8,6 +8,7 @@
 #include <rom/rtc.h>
 #include <sys/time.h>
 #include <Wire.h>
+#include <WiFi.h>
 
 class ESP32Board : public mesh::MainBoard {
 protected:
@@ -42,6 +43,23 @@ class ESP32Board : public mesh::MainBoard {
   #endif
   }
 
+  void enterLightSleep (uint32_t secs) {
+    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
+  }
+
+  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)
@@ -78,6 +96,8 @@ class ESP32Board : public mesh::MainBoard {
   #endif
   }
 
+
+
   const char* getManufacturerName() const override {
     return "Generic ESP32";
   }

variants/heltec_v3/platformio.ini

@@ -48,6 +48,7 @@ build_flags =
   -D MAX_NEIGHBOURS=50
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
+  -D POWERSAVING_MODE=1
 build_src_filter = ${Heltec_lora32_v3.build_src_filter}
   +<helpers/ui/SSD1306Display.cpp>
   +<../examples/simple_repeater>

variants/heltec_v4/platformio.ini

@@ -59,6 +59,7 @@ build_flags =
   -D MAX_NEIGHBOURS=50
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
+  -D POWERSAVING_MODE=1
 build_src_filter = ${Heltec_lora32_v4.build_src_filter}
   +<helpers/ui/SSD1306Display.cpp>
   +<../examples/simple_repeater>

variants/xiao_s3_wio/platformio.ini

@@ -40,6 +40,7 @@ build_flags =
   -D MAX_NEIGHBOURS=50
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
+  -D POWERSAVING_MODE=1
 lib_deps =
   ${Xiao_S3_WIO.lib_deps}
   ${esp32_ota.lib_deps}