如果I readValue，则iOS BLE外围设备writeValue不起作用

DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) {
    // 在这里执行writeValue操作
}

func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
    guard let services = peripheral.services else { return }
    for service in services {
        peripheral.discoverCharacteristics(nil, for: service)
    }
}

func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
    guard let characteristics = service.characteristics else { return }
    for characteristic in characteristics {
        if characteristic.properties.contains(.write) {
            // 在这里执行writeValue操作
        }
    }
}

let writeCharacteristic = CBMutableCharacteristic(type: CBUUID(string: "YOUR_CHARACTERISTIC_UUID"), properties: [.write], value: nil, permissions: [.writeable])