如何从iOS应用中检索蓝牙外围设备中存储的数据

问题描述

我有一个Swift iOS项目，该项目能够检测蓝牙Accu-Chek指南外围设备，获得所需的血糖服务和特征（血糖测量，血糖测量上下文和远程访问控制点），但无法获取数据存储在Accu-Chek设备中。当我写远程访问控制点特征以便检索所有存储的数据时，“ didWriteValueFor特征”委托函数会收到“未知ATT错误”。

这是我通过写入RACP（远程访问控制点特征）来请求数据的方式：

let bytes:[UInt8] = [0x01,0x01]
let myData:Data = Data(bytes: bytes,count: 2)
self.connectedPeripheral?.writeValue(myData,for: self.RACP!,type: .withResponse)

仅在检测到包括RACP在内的特征后，才触发上述代码。通过使用“ diddiscovercharacteristicsFor service”委托方法中的日志，我确定已经发现了所需的特征。

我也确信RACP允许写入响应，因为我已将其记录为真实：

if self.RACP!.properties.contains(.write){
    print("contains write...")
}

这是“ diddiscoverCharacteristicFor服务：”

func peripheral(_ peripheral: CBPeripheral,diddiscovercharacteristicsFor service: CBService,error: Error?) {
        
        if let errorService = error{
            print("error diddiscovercharacteristicsFor \(errorService.localizedDescription)")
            glucoseperipherals = []
            deviceTable.reloadData()
            centralManager.scanForperipherals(withServices: [glucoseServiceCBUUID])
            return
        }

        guard let characteristics = service.characteristics else { return }
        
        // Set notifications for glucose measurement and context
        // 0x2a18 is glucose measurement,0x2a34 is context,0x2a52 is RACP,// 0x2A51 is glucose Feature
        for characteristic in characteristics {

            if (characteristic.uuid == glucoseMeasurementCharacteristicCBUUID ||
               characteristic.uuid == glucoseMeasurementContextCharacteristicCBUUID ||
            characteristic.uuid == recordAccessControlPointCharacteristicCBUUID)
            {
                
                print("diddiscovercharacteristicsFor characteristics.uid ",characteristic.uuid)
                print("diddiscovercharacteristicsFor characteristics ",characteristic)
                
                if characteristic.uuid == glucoseMeasurementCharacteristicCBUUID{
                    self.glucoseMeasurementCharacteristic = characteristic
                }
                if characteristic.uuid == glucoseMeasurementContextCharacteristicCBUUID{
                    self.glucoseMeasurementContextCharacteristic = characteristic
                }

                                
                if characteristic.properties.contains(.read) {
                    dispatchQueue.main.asyncAfter(deadline: .Now() + 0.5) {
                        peripheral.readValue(for: characteristic)
                    }
                }
                if characteristic.properties.contains(.notify) {
                    dispatchQueue.main.asyncAfter(deadline: .Now() + 1.0) {
                        peripheral.setNotifyValue(true,for: characteristic)
                    }
                }
                
                if characteristic.properties.contains(.indicate) {
                    print("value is indicate for characteristics.uid ",characteristic.uuid)
                }
                    
                if characteristic.uuid == recordAccessControlPointCharacteristicCBUUID {
                    self.RACP = characteristic
                }
            }
        }
    }

也许是由于“ didWriteValueFor特性”中的“未知ATT错误”，所以未调用“ didUpdateValueFor特性：”委托方法。

请提供有关错误以及如何检索外围设备中存储的数据的建议。谢谢。

解决方法

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