如何从使用 SWIFT 3 的 iOS 应用程序中的测量特征 UUID：AND BLE WS 的 2A9D 获取实际测量值？

Question

我正在尝试使用 swift 在 iOS 应用中从 AND BLE 体重秤型号的测量特征 UUID 同步实际测量值：A&D_UC-352BLE_011E17。该应用程序正在从 BLE WS 读取测量特征 UUID 和 10 字节值，但是当它试图从 NSData 读取实际测量值时，它正在同步并在应用程序中显示错误值，例如实际重量 59.2 KG应用程序的值为 11860.0。

我已经实现了从这个 BLE WS 配对和同步数据所需的所有相关方法，很可能该应用程序还从 BLE WS 获取体重秤测量服务 UUID：181D 和测量特征 UUID：2A9D，因为我在 Xcode 调试控制台中看到了这些值。

在那种情况下，我认为主要问题在于reading/converting测量特征UUID值与double类型的实际测量值。下面给出了我的didUpdateCharacteristicValue方法，请教我如何从测量特征UUID中获取实际测量值？

func didUpdateCharacteristicValue(_ characteristic: CBCharacteristic){
communicating = true

    let charUUID = ANDWeightScaleBTManager.measurementWeightCharacteristicUUID

    print("did update value for characteristic")

    print("charUUID:", charUUID)

    print("charValue is", characteristic.value!)

    print("value is:" + (characteristic.value?.base64EncodedString())!)

    if (charUUID == ANDWeightScaleBTManager.measurementWeightCharacteristicUUID) 

    {
        NSLog("Got Weight Scale Measurement char")

        var weightData: NSData

        weightData = characteristic.value! as NSData

        //var data: NSData

        //weightData = NSData.init(data: characteristic.value!)//if (bpmData.length <= 12) {

        let flag = weightData.subdata(with: NSRange.init(location: 0, length: 1))

        let unit : UInt16 = readInteger(data: weightData, start: 0)

        let weight : UInt16 = readInteger(data: weightData, start: 1)

        print("weight: \(weight)")//print the output

        var message: String

        var image: UIImage

        var data = [MeasurementType: Double]()

        message = "Completed measurement."

        image = UIImage(named: "Success")!

        data = [.weight: Double(weight)]

        shouldEnd = true

        update(data, message, image, shouldEnd)

    } 
}

Answer 1

如果您参考 documentation for the characteristic，您会看到公制 (SI) 值的单位是 0.005 千克。

如果将您拥有的值 11860 乘以 0.005，您将得到 59.3 公斤。

let kg = Double(weight) * 0.005

如何从使用 SWIFT 3 的 iOS 应用程序中的测量特征 UUID：AND BLE WS 的 2A9D 获取实际测量值？

How to get the actual measurement value from measurement chracteristic UUID: 2A9D of AND BLE WS in an iOS app using SWIFT 3?

ios

swift3