在这里，我们试图从J1939 SAE总线设备读取数据，但似乎它没有与iOS读取，我们正在与Core bluetooth连接，我们已经在Android和Android中完成了工作，但相同的设备没有与iOS读取可以任何一个请帮助我。
这里我附上我的代码片段
将Bluetooth设备连接为SEA J1939

var manager:CBCentralManager! 
manager.connect(connectPeripheral, options: nil) 
connectPeripheral.delegate = self

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蓝牙连接成功

func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
         print("Connected!")
         self.showAlertOneButton(withTitle: "", with: key.KBluetoothConnect, firstButton: key.KOk) { (UIAlertAction) in
             self.navigationItem.rightBarButtonItem?.tintColor = UIColor.blue
             self.vwBLTSub.removeFromSuperview()
             //all services
             self.connectPeripheral.discoverServices(nil)
         }
     }

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从设备读取数据

func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService,
                    error: Error?) {
        guard let characteristics = service.characteristics else { return }

        for characteristic in characteristics {
            print(characteristic)
            if characteristic.properties.contains(.read) {
                print("\(characteristic.uuid): properties contains .read")

                peripheral.readValue(for: characteristic)
            }
            if characteristic.properties.contains(.notify) {
                print("\(characteristic.uuid): properties contains .notify")

            }
        }
    }

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