Repeater and other power optimizations (#2999)

* End wire if we find no i2c devices

* Set tx-power to 0 on nrf bluetooth shutdown

* Change polling interval of PowerFSM to 100ms instead of 10ms

* Guard 3v3

src/PowerFSMThread.h

@@ -33,7 +33,7 @@ class PowerFSMThread : public OSThread
             powerFSM.trigger(EVENT_SHUTDOWN);
         }
 
-        return 10;
+        return 100;
     }
 };
 

src/main.cpp

@@ -432,6 +432,10 @@ void setup()
     auto i2cCount = i2cScanner->countDevices();
     if (i2cCount == 0) {
         LOG_INFO("No I2C devices found\n");
+        Wire.end();
+#ifdef I2C_SDA1
+        Wire1.end();
+#endif
     } else {
         LOG_INFO("%i I2C devices found\n", i2cCount);
     }
@@ -576,10 +580,13 @@ void setup()
     // but we need to do this after main cpu init (esp32setup), because we need the random seed set
     nodeDB.init();
 
-    // If we're taking on the repeater role, use flood router
-    if (config.device.role == meshtastic_Config_DeviceConfig_Role_REPEATER)
+    // If we're taking on the repeater role, use flood router and turn off 3V3_S rail because peripherals are not needed
+    if (config.device.role == meshtastic_Config_DeviceConfig_Role_REPEATER) {
         router = new FloodingRouter();
-    else
+#ifdef PIN_3V3_EN
+        digitalWrite(PIN_3V3_EN, LOW);
+#endif
+    } else
         router = new ReliableRouter();
 
 #if HAS_BUTTON || defined(ARCH_RASPBERRY_PI)
@@ -653,7 +660,10 @@ void setup()
 
     readFromRTC(); // read the main CPU RTC at first (in case we can't get GPS time)
 
-    gps = GPS::createGps();
+    // If we're taking on the repeater role, ignore GPS
+    if (config.device.role != meshtastic_Config_DeviceConfig_Role_REPEATER) {
+        gps = GPS::createGps();
+    }
     if (gps) {
         gpsStatus->observe(&gps->newStatus);
     } else {
@@ -941,4 +951,4 @@ void loop()
         mainDelay.delay(delayMsec);
     }
     // if (didWake) LOG_DEBUG("wake!\n");
-}
+}

src/platform/nrf52/NRF52Bluetooth.cpp

@@ -211,6 +211,7 @@ void NRF52Bluetooth::shutdown()
     // Shutdown bluetooth for minimum power draw
     LOG_INFO("Disable NRF52 bluetooth\n");
     Bluefruit.Advertising.stop();
+    Bluefruit.setTxPower(0); // Minimum power
 }
 
 bool NRF52Bluetooth::isConnected()
@@ -333,4 +334,4 @@ void NRF52Bluetooth::onPairingCompleted(uint16_t conn_handle, uint8_t auth_statu
         LOG_INFO("BLE pairing failed\n");
 
     screen->stopBluetoothPinScreen();
-}
+}