func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
            switch characteristic.uuid {
case derivedMeasurements2CharacteristicsCBUUID:
                var dewpoint: Int16 = 0
                _ = withUnsafeMutableBytes(of: &dewpoint) {characteristic.value!.copyBytes(to: $0, from: 0...1)}

                var dew = Double(dewpoint) / 100.0
                dew = (dew * 9/5) + 32
                weatherReading.dewPoint = dew
}