sensecap solar: add poweroff command and board power/LED parity

variants/sensecap_solar/SenseCapSolarBoard.h

@@ -5,6 +5,11 @@
 #include <helpers/NRF52Board.h>
 
 class SenseCapSolarBoard : public NRF52BoardDCDC {
+protected:
+#ifdef NRF52_POWER_MANAGEMENT
+  void initiateShutdown(uint8_t reason) override;
+#endif
+
 public:
   SenseCapSolarBoard() : NRF52Board("SENSECAP_SOLAR_OTA") {}
   void begin();
@@ -31,4 +36,23 @@ public:
   const char* getManufacturerName() const override {
     return "Seeed SenseCap Solar";
   }
+
+  void powerOff() override {
+    digitalWrite(LED_GREEN, LOW);
+    digitalWrite(LED_BLUE, LOW);
+
+#ifdef PIN_USER_BTN
+    while (digitalRead(PIN_USER_BTN) == LOW);
+    nrf_gpio_cfg_sense_input(digitalPinToInterrupt(g_ADigitalPinMap[PIN_USER_BTN]), NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_SENSE_LOW);
+#elif defined(PIN_BUTTON1)
+    while (digitalRead(PIN_BUTTON1) == LOW);
+    nrf_gpio_cfg_sense_input(digitalPinToInterrupt(g_ADigitalPinMap[PIN_BUTTON1]), NRF_GPIO_PIN_NOPULL, NRF_GPIO_PIN_SENSE_LOW);
+#endif
+
+#ifdef NRF52_POWER_MANAGEMENT
+    initiateShutdown(SHUTDOWN_REASON_USER);
+#else
+    sd_power_system_off();
+#endif
+  }
 };