Power saving repeater

src/main.cpp

@@ -553,7 +553,10 @@ void setup()
 
     readFromRTC(); // read the main CPU RTC at first (in case we can't get GPS time)
 
-    gps = GPS::createGps();
+    if (config.device.role != meshtastic_Config_DeviceConfig_Role_REPEATER) {
+        gps = GPS::createGps();
+    }
+
     if (gps) {
         gpsStatus->observe(&gps->newStatus);
     } else {
@@ -738,6 +741,10 @@ void setup()
     powerFSMthread = new PowerFSMThread();
 
     setCPUFast(false); // 80MHz is fine for our slow peripherals
+    // Power saving Repeaters turn pretty much everything off except the radio and CPU
+    if (config.device.role == meshtastic_Config_DeviceConfig_Role_REPEATER && config.power.is_power_saving) {
+        setCpuLowPower();
+    }
 }
 
 uint32_t rebootAtMsec;   // If not zero we will reboot at this time (used to reboot shortly after the update completes)

src/platform/nrf52/main-nrf52.cpp

@@ -210,4 +210,33 @@ void clearBonds()
         nrf52Bluetooth->setup();
     }
     nrf52Bluetooth->clearBonds();
+}
+
+void setCpuLowPower()
+{
+    LOG_DEBUG("Setting CPU to LOW power\n");
+    // This may cause crashes as debug messages continue to flow.
+    Serial.end();
+
+#ifdef PIN_SERIAL_RX1
+    Serial1.end();
+#endif
+    setBluetoothEnable(false);
+
+#ifdef RAK4630
+#ifdef PIN_3V3_EN
+    digitalWrite(PIN_3V3_EN, LOW);
+#endif
+#ifndef USE_EINK
+    // RAK-12039 set pin for Air quality sensor
+    digitalWrite(AQ_SET_PIN, LOW);
+#endif
+#endif
+    sd_power_mode_set(NRF_POWER_MODE_LOWPWR);
+}
+
+void setCpuHighPower()
+{
+    LOG_DEBUG("Setting CPU to HIGH power\n");
+    sd_power_mode_set(NRF_POWER_MODE_CONSTLAT);
 }

src/target_specific.h

@@ -7,4 +7,8 @@
 // Enable/disable bluetooth.
 void setBluetoothEnable(bool on);
 
-void getMacAddr(uint8_t *dmac);
+void getMacAddr(uint8_t *dmac);
+
+void setCpuHighPower();
+
+void setCpuLowPower();