Add support for the Bosch BME280 environmental sensor

devices/example-bme280/Impl.cpp

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+#include "../features/BME280.h"
+#include "Device.h"
+
+
+constexpr const char BME280_NAME[] = "bme280";
+const uint8_t BME280_I2C_ADDR = 0x76;
+
+class Bme280Device : public Device {
+public:
+    Bme280Device() :
+            bme280(this)
+    {
+        this->add(&(this->bme280));
+    }
+
+private:
+    BME280<BME280_NAME, BME280_I2C_ADDR> bme280;
+};
+
+
+Device* createDevice() {
+    return new Bme280Device();
+}
+
+

devices/example-bme280/Readme.md

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+An example device featuring the [Bosch BME280](https://www.bosch-sensortec.com/bst/products/all_products/bme280) environmental sensor.
+
+It provides data on:
+ - barometric pressure
+ - relative humidity
+ - temperature

framework/features/BME280.h

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+#ifndef BME280_SENSOR_H
+#define BME280_SENSOR_H
+
+#include "Feature.h"
+#include <Libraries/Adafruit_BME280_Library/Adafruit_BME280.h>
+
+#define SEALEVELPRESSURE_HPA (1013.25)
+
+template<const char* const name, uint8_t addr>
+class BME280 : public Feature<name> {
+
+protected:
+    using Feature<name>::LOG;
+    Adafruit_BME280 bme280;
+
+public:
+
+    BME280(Device* device) :
+            Feature<name>(device) {
+
+            bool status;
+            status = bme280.begin(addr);
+            if (!status) {
+                Serial.println("Could not detect a BME280 sensor, check wiring!");
+                while (1);
+            }
+
+            delay(100); // wait for the sensor to boot up
+
+            this->updateTimer.initializeMs(15000, TimerDelegate(&BME280::publishCurrentState, this));
+            this->updateTimer.start(true);
+        }
+
+protected:
+    virtual void publishCurrentState() {
+        long pressure = bme280.readPressure();
+        LOG.log("Pressure:", pressure);
+        this->publish("pressure", String(pressure));
+
+        float temperature = bme280.readTemperature();
+        LOG.log("Temperature:", temperature);
+        this->publish("temperature", String(temperature));
+
+        float humidity = bme280.readHumidity();
+        LOG.log("Humidity", humidity);
+        this->publish("humidity", String(humidity));
+    }
+
+private:
+    Timer updateTimer;
+
+};
+
+
+#endif