firmware/src/modules/Telemetry/Sensor/BME680Sensor.cpp

#include "BME680Sensor.h"
#include "../mesh/generated/meshtastic/telemetry.pb.h"
#include "FSCommon.h"
#include "TelemetrySensor.h"
#include "configuration.h"

BME680Sensor::BME680Sensor() : TelemetrySensor(meshtastic_TelemetrySensorType_BME680, "BME680") {}

int32_t BME680Sensor::runOnce()
{
    LOG_INFO("Init sensor: %s\n", sensorName);
    if (!hasSensor()) {
        return DEFAULT_SENSOR_MINIMUM_WAIT_TIME_BETWEEN_READS;
    }
    bme680.begin(nodeTelemetrySensorsMap[sensorType], Wire);
    if (bme680.bsecStatus == BSEC_OK) {
        bme680.setConfig(bsec_config_iaq);
        loadState();
        bme680.updateSubscription(sensorList, 13, BSEC_SAMPLE_RATE_LP);
        status = 1;
    } else {
        status = 0;
    }

    return initI2CSensor();
}

void BME680Sensor::setup() {}

bool BME680Sensor::getMetrics(meshtastic_Telemetry *measurement)
{
    bme680.run();
    measurement->variant.environment_metrics.temperature = bme680.temperature;
    measurement->variant.environment_metrics.relative_humidity = bme680.humidity;
    measurement->variant.environment_metrics.barometric_pressure = bme680.pressure / 100.0F;
    measurement->variant.environment_metrics.gas_resistance = bme680.gasResistance / 1000.0;
    updateState();

    // Check if we need to save state to filesystem (every STATE_SAVE_PERIOD ms)

    return true;
}

void BME680Sensor::loadState()
{
#ifdef FSCom
    if (File file = FSCom.open(bsecConfigFileName, FILE_O_READ)) {
        file.read((uint8_t *)&bsecState, BSEC_MAX_STATE_BLOB_SIZE);
        file.close();
        bme680.setState(bsecState);
    } else {
        FSCom.remove(bsecConfigFileName);
    }
#endif
}

void BME680Sensor::updateState()
{
#ifdef FSCom
    bool update = false;
    if (stateUpdateCounter == 0) {
        /* First state update when IAQ accuracy is >= 3 */
        if (bme680.iaqAccuracy >= 3) {
            update = true;
            stateUpdateCounter++;
        }
    } else {
        /* Update every STATE_SAVE_PERIOD minutes */
        if ((stateUpdateCounter * STATE_SAVE_PERIOD) < millis()) {
            update = true;
            stateUpdateCounter++;
        }
    }

    if (update) {
        bme680.getState(bsecState);
        if (File file = FSCom.open(bsecConfigFileName, FILE_O_WRITE)) {
            file.write((uint8_t *)&bsecState, BSEC_MAX_STATE_BLOB_SIZE);
            file.flush();
            file.close();
        }
    }
#endif
}