protected override async Task RunContinuouslyAsync(IMqttClient client, TimeSpan delay, CancellationToken stoppingToken)
{
var bme280 = new BME280("/dev/i2c-1", 0x76);
var settings = new bme280_settings
{
osr_h = BME280_OVERSAMPLING_1X,
osr_p = BME280_OVERSAMPLING_1X,
osr_t = BME280_OVERSAMPLING_1X,
filter = BME280_FILTER_COEFF_OFF
};
bme280.SetSensorSettings(ref settings, BME280_OSR_HUM_SEL | BME280_OSR_PRESS_SEL | BME280_OSR_TEMP_SEL);
var oldData = new bme280_data();
var nextReportTime = DateTimeOffset.MinValue;
while (!stoppingToken.IsCancellationRequested)
{
bme280.SetSensorMode(BME280_FORCED_MODE);
await Task.Delay(100, stoppingToken).ConfigureAwait(false);
var data = bme280.GetSensorData(BME280_ALL);
var now = DateTimeOffset.UtcNow;
if ((now > nextReportTime) || ShouldReport(ref oldData, ref data))
{
await SendReading(client, data, stoppingToken);
oldData = data;
nextReportTime = now.AddSeconds(60);
}
await Task.Delay(delay, stoppingToken);
}
}
private Task SendReading(IMqttClient client, bme280_data sensorData, CancellationToken stoppingToken)
{
var data = new
{
humidity = sensorData.HumidityPercent,
pressure = sensorData.PressureHPa,
temperature = sensorData.TemperatureCentigrade
};
return(SendState(client, data, stoppingToken));
}
private bool ShouldReport(ref bme280_data oldData, ref bme280_data newData)
{
if (Math.Abs(oldData.TemperatureCentigrade - newData.TemperatureCentigrade) > 0.5)
{
return(true);
}
if (Math.Abs(oldData.PressureHPa - newData.PressureHPa) > 1)
{
return(true);
}
if (Math.Abs(oldData.HumidityPercent - newData.HumidityPercent) > 1)
{
return(true);
}
return(false);
}
