Initial commit: Simple Sensor firmware for Heltec T114 with BME280

- MeshCore-based Simple Sensor firmware
- Heltec T114 without display
- BME280 sensor support (temp/humidity/pressure)
- Radio: 868.856018 MHz, SF7, BW62.5 kHz, CR4/7
- 2-byte path hash
- PlatformIO project

variants/wio-e5-mini/target.h

@@ -0,0 +1,64 @@
+#pragma once
+
+#define RADIOLIB_STATIC_ONLY 1
+#include <RadioLib.h>
+#include <helpers/radiolib/RadioLibWrappers.h>
+#include <helpers/stm32/STM32Board.h>
+#include <helpers/radiolib/CustomSTM32WLxWrapper.h>
+#include <helpers/ArduinoHelpers.h>
+#include <helpers/SensorManager.h>
+#ifdef DISPLAY_CLASS
+  #include "NullDisplayDriver.h"
+#endif
+
+#include <BME280I2C.h>
+#include <Wire.h>
+
+#ifdef DISPLAY_CLASS
+  extern NullDisplayDriver display;
+#endif
+
+class WIOE5Board : public STM32Board {
+public:
+    void begin() override {
+        STM32Board::begin();
+
+        pinMode(LED_RED, OUTPUT);
+        digitalWrite(LED_RED, HIGH);
+        pinMode(USER_BTN, INPUT_PULLUP);
+    }
+
+    const char* getManufacturerName() const override {
+        return "Seeed Wio E5 mini";
+    }
+
+    uint16_t getBattMilliVolts() override {
+        analogReadResolution(12);
+        uint32_t raw = 0;
+        for (int i=0; i<8;i++) {
+            raw += analogRead(PIN_A3);
+        }
+        return ((double)raw) * 1.73 * 5 * 1000 / 8 / 4096;
+    }
+};
+
+class WIOE5SensorManager : public SensorManager {
+    BME280I2C bme;
+    bool has_bme = false;
+
+public:
+    WIOE5SensorManager() {}
+    bool begin() override;
+    bool querySensors(uint8_t requester_permissions, CayenneLPP& telemetry) override;
+};
+
+extern WIOE5Board board;
+extern WRAPPER_CLASS radio_driver;
+extern VolatileRTCClock rtc_clock;
+extern WIOE5SensorManager sensors;
+
+bool radio_init();
+uint32_t radio_get_rng_seed();
+void radio_set_params(float freq, float bw, uint8_t sf, uint8_t cr);
+void radio_set_tx_power(int8_t dbm);
+mesh::LocalIdentity radio_new_identity();