如何通过BLE连接ACR1555U读取ISO14443标签ID？

设备BLE服务与特征 #

已获取ACR1555U暴露的自定义服务：

• 服务UUID：00003970-817c-48df-8db2-476a8134ede0

该服务包含以下特征：

#00: Custom Characteristic: (00003971-817c-48df-8db2-476a8134ede0) (Write only)
#01: Response (00003972-817c-48df-8db2-476a8134ede0) (Notify Only)
#02: PICC NOTIFY (00003973-817c-48df-8db2-476a8134ede0) (Notify Only)

标签检测通知正常 #

卡片靠近读卡器时，能收到00003973-817c-48df-8db2-476a8134ede0特征的2字节通知：

十六进制值：50 03

卡片移开时，收到该特征的2字节通知：

十六进制值：50 02

特征订阅功能正常。

写入指令无有效响应 #

无论向#00特征写入什么数据，返回的响应始终无有效内容，示例如下：

BLE: write #00 62 00 00 00 00 00 00 00 00 00
Value changed for 00003972-817c-48df-8db2-476a8134ede0 (19 bytes):
utf8:   U
♣S       ♣ Y?
hex:    55 00 00 0A 00 00 05 53 00 00 00 00 00 00 00 05 00 59 AA

BLE: write #00 FF CA 00 00 00
Value changed for 00003972-817c-48df-8db2-476a8134ede0 (19 bytes):
utf8:   U
S       ♣ ?
hex:    55 00 00 0A 00 00 00 53 00 00 00 00 00 00 00 05 00 5C AA

.NET MAUI实现代码 #

目前用.NET MAUI实现，Windows原生BLE控制台测试也得到相同结果：

ICharacteristic writeCharacteristic;
 
private async Task ProcessBleServicesDiscovered(IDevice device, IReadOnlyList<IService> services)
{
    foreach (var service in services)
    {
        if (service.Id.ToString().ToLower() == "00003970-817c-48df-8db2-476a8134ede0")
        {
            Console.WriteLine($"Service UUID: {service.Id}-Name:{service.Name}");

            var characteristics = await service.GetCharacteristicsAsync();
            foreach (var characteristic in characteristics)
            {
                Console.WriteLine($"Characteristic UUID: {characteristic.Id}-Name:{characteristic.Name}  CanRead:{characteristic.CanRead} CanUpdate:{characteristic.CanUpdate} CanWrite:{characteristic.CanWrite} ");

                if (characteristic.CanUpdate)
                {
                    Console.WriteLine($"Characteristic UUID {characteristic.Id} subscribed to update ");

                    characteristic.ValueUpdated += async (o, args) =>
                    {
                        try
                        {
                            Console.WriteLine($"Characteristic {args.Characteristic.Id}-{characteristic.Name}  updated Value:{(String.Join(',', args.Characteristic.Value))}  ");
                        }
                        catch (Exception ex)
                        {
                            Console.WriteLine("Something went wrong updating value...." + ex.Message);
                        }

                        if (args.Characteristic.Id.ToString() == "00003973-817c-48df-8db2-476a8134ede0")
                        {
                            _ = Task.Run(async () =>
                            {
                                await Task.Delay(500);
                                var result = await writeCharacteristic.WriteAsync(new byte[] { 0xFF ,0xCA ,0x00 ,0x00 ,0x00 });                                     
                            });
                        }
                    };
                    await characteristic.StartUpdatesAsync();
                }

                if (characteristic.CanWrite)
                {                       
                    writeCharacteristic = characteristic;
                }
            }
        }
    }
}

求助解决思路 #

怀疑遗漏了激活流程的某个步骤，或者数据帧格式不完整，但始终无法解决。需求是识别到标签存在后，通过BLE连接获取其ID，尝试过不同数据帧但始终收到类似无效响应，求提供解决方向。

内容的提问来源于stack exchange，提问作者raul garcia