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社区首页 >问答首页 >通知有时在RxAndroidBle可观察的通知/写入中不被调用

问通知有时在RxAndroidBle可观察的通知/写入中不被调用
EN

Stack Overflow用户
提问于 2017-02-23 08:10:39
回答 1查看 578关注 0票数 1

我目前正在使用RxAndroidBle编写一个固件到蓝牙设备。按照它的工作方式，我必须将数据块(每块580字节)发送到一个WRITE_CHARACTERISTIC_UUID上的蓝牙设备，然后在LISTEN_CHARACTERISTIC_UUID上侦听结果，以检查蓝牙设备是否成功地确认了该块。

理想情况下，我希望这个写和通知链是一个操作，所以我使用来自类似堆栈溢出问题(https://stackoverflow.com/a/41140523/734385)的代码：

代码语言：javascript
复制
private byte[] writeData(byte[] _payload) {
    return mBleConnection
            .flatMap( // when the connection is available...
                    rxBleConnection -> rxBleConnection.setupNotification(LISTEN_UUID), // ... setup the notification...
                    (rxBleConnection, apScanDataNotificationObservable) -> Observable.combineLatest( // ... when the notification is setup...
                            rxBleConnection.createNewLongWriteBuilder().setBytes(_payload).setCharacteristicUuid(WRITE_UUID).setMaxBatchSize(20).build(),
                            apScanDataNotificationObservable.first(), // ... and observe for the first notification on the AP_SCAN_DATA
                            (writtenBytes, responseBytes) -> responseBytes // ... when both will appear return just the response bytes...
                    )
            )
            .flatMap(observable -> observable) // ... flatMap the result as it is Observable<byte[]>...
            .toBlocking()
            .first(); // ... and finish after first response is received to cleanup notifications
}

问题是，这只工作了前几次，然后写操作成功，但我从来没有得到通知。这是在停止之前的最后几块日志：

代码语言：javascript
复制
02-23 08:46:33.765 2864-5256/com.company.android.ble I/BLE_FW_WRITE: [FW_CHUNK_24] starting
02-23 08:46:33.772 2864-4250/com.company.android.ble D/RxBle#Radio:   QUEUED RxBleRadioOperationDescriptorWrite(182789785)
02-23 08:46:33.772 2864-3150/com.company.android.ble D/RxBle#Radio:  STARTED RxBleRadioOperationDescriptorWrite(182789785)
02-23 08:46:33.773 2864-5256/com.company.android.ble D/BluetoothGatt: setCharacteristicNotification() - uuid: 69af0004-f994-3a57-749b-0e0aad3fca18 enable: true
02-23 08:46:33.777 2864-5256/com.company.android.ble D/RxBle#Radio:   QUEUED RxBleRadioOperationDescriptorWrite(22527736)
02-23 08:46:33.910 2864-2888/com.company.android.ble D/RxBle#BluetoothGatt: onDescriptorWrite descriptor=00002902-0000-1000-8000-00805f9b34fb status=0
02-23 08:46:33.912 2864-3150/com.company.android.ble D/RxBle#Radio: FINISHED RxBleRadioOperationDescriptorWrite(182789785)
02-23 08:46:33.912 2864-3150/com.company.android.ble D/RxBle#Radio:  STARTED RxBleRadioOperationDescriptorWrite(22527736)
02-23 08:46:34.055 2864-3032/com.company.android.ble D/RxBle#BluetoothGatt: onDescriptorWrite descriptor=00002902-0000-1000-8000-00805f9b34fb status=0
02-23 08:46:34.059 2864-4250/com.company.android.ble D/RxBle#Radio:   QUEUED RxBleRadioOperationCharacteristicLongWrite(71420405)
02-23 08:46:34.063 2864-3150/com.company.android.ble D/RxBle#Radio: FINISHED RxBleRadioOperationDescriptorWrite(22527736)
02-23 08:46:34.063 2864-3150/com.company.android.ble D/RxBle#Radio:  STARTED RxBleRadioOperationCharacteristicLongWrite(71420405)
02-23 08:46:34.067 2864-3093/com.company.android.ble D/RxBle#BluetoothGatt: onCharacteristicWrite characteristic=69af0003-f994-3a57-749b-0e0aad3fca18 status=0
<more onCharacteristicWrites here, but omitted due to max post length>
02-23 08:46:34.204 2864-3032/com.company.android.ble D/RxBle#BluetoothGatt: onCharacteristicWrite characteristic=69af0003-f994-3a57-749b-0e0aad3fca18 status=0
02-23 08:46:34.207 2864-3150/com.company.android.ble D/RxBle#Radio: FINISHED RxBleRadioOperationCharacteristicLongWrite(71420405)
02-23 08:46:35.041 2864-3093/com.company.android.ble D/RxBle#BluetoothGatt: onCharacteristicChanged characteristic=69af0004-f994-3a57-749b-0e0aad3fca18
02-23 08:46:35.044 2864-5256/com.company.android.ble I/BLE_FW_WRITE: [FW_CHUNK_25] starting
02-23 08:46:35.044 2864-4250/com.company.android.ble D/BluetoothGatt: setCharacteristicNotification() - uuid: 69af0004-f994-3a57-749b-0e0aad3fca18 enable: false
02-23 08:46:35.048 2864-4250/com.company.android.ble D/RxBle#Radio:   QUEUED RxBleRadioOperationDescriptorWrite(183984640)
02-23 08:46:35.049 2864-3150/com.company.android.ble D/RxBle#Radio:  STARTED RxBleRadioOperationDescriptorWrite(183984640)
02-23 08:46:35.053 2864-5256/com.company.android.ble D/BluetoothGatt: setCharacteristicNotification() - uuid: 69af0004-f994-3a57-749b-0e0aad3fca18 enable: true
02-23 08:46:35.060 2864-5256/com.company.android.ble D/RxBle#Radio:   QUEUED RxBleRadioOperationDescriptorWrite(71847163)
02-23 08:46:35.185 2864-3073/com.company.android.ble D/RxBle#BluetoothGatt: onDescriptorWrite descriptor=00002902-0000-1000-8000-00805f9b34fb status=0
02-23 08:46:35.188 2864-3150/com.company.android.ble D/RxBle#Radio: FINISHED RxBleRadioOperationDescriptorWrite(183984640)
02-23 08:46:35.189 2864-3150/com.company.android.ble D/RxBle#Radio:  STARTED RxBleRadioOperationDescriptorWrite(71847163)
02-23 08:46:35.276 2864-2887/com.company.android.ble D/RxBle#BluetoothGatt: onDescriptorWrite descriptor=00002902-0000-1000-8000-00805f9b34fb status=0
02-23 08:46:35.281 2864-4250/com.company.android.ble D/RxBle#Radio:   QUEUED RxBleRadioOperationCharacteristicLongWrite(66222734)
02-23 08:46:35.283 2864-3150/com.company.android.ble D/RxBle#Radio: FINISHED RxBleRadioOperationDescriptorWrite(71847163)
02-23 08:46:35.283 2864-3150/com.company.android.ble D/RxBle#Radio:  STARTED RxBleRadioOperationCharacteristicLongWrite(66222734)
02-23 08:46:35.287 2864-3032/com.company.android.ble D/RxBle#BluetoothGatt: onCharacteristicWrite characteristic=69af0003-f994-3a57-749b-0e0aad3fca18 status=0
<more onCharacteristicWrites here, but omitted due to max post length>
02-23 08:46:35.441 2864-3032/com.company.android.ble D/RxBle#BluetoothGatt: onCharacteristicWrite characteristic=69af0003-f994-3a57-749b-0e0aad3fca18 status=0
02-23 08:46:35.447 2864-3150/com.company.android.ble D/RxBle#Radio: FINISHED RxBleRadioOperationCharacteristicLongWrite(66222734)
02-23 08:46:36.298 2864-2975/com.company.android.ble D/RxBle#BluetoothGatt: onCharacteristicChanged characteristic=69af0004-f994-3a57-749b-0e0aad3fca18
02-23 08:46:36.301 2864-4250/com.company.android.ble I/BLE_FW_WRITE: combine data for FW_CHUNK_25
02-23 08:46:36.303 2864-4250/com.company.android.ble D/BluetoothGatt: setCharacteristicNotification() - uuid: 69af0004-f994-3a57-749b-0e0aad3fca18 enable: false
02-23 08:46:36.303 2864-5256/com.company.android.ble D/SFlashRawWrite: msg length (total): 20, payload length: 3
02-23 08:46:36.303 2864-5256/com.company.android.ble D/SFlashRawWrite: msgId: -128
02-23 08:46:36.304 2864-5256/com.company.android.ble D/SFlashRawWrite: acked msg: 17 result: 1
02-23 08:46:36.304 2864-5256/com.company.android.ble I/BLE_TIMING: chunk 25 took 1260 ms
02-23 08:46:36.304 2864-5256/com.company.android.ble I/BLE_FW_WRITE: [FW_CHUNK_26] starting
02-23 08:46:36.313 2864-4250/com.company.android.ble D/RxBle#Radio:   QUEUED RxBleRadioOperationDescriptorWrite(248228237)
02-23 08:46:36.317 2864-5256/com.company.android.ble D/BluetoothGatt: setCharacteristicNotification() - uuid: 69af0004-f994-3a57-749b-0e0aad3fca18 enable: true
02-23 08:46:36.319 2864-3150/com.company.android.ble D/RxBle#Radio:  STARTED RxBleRadioOperationDescriptorWrite(248228237)
02-23 08:46:36.321 2864-5256/com.company.android.ble D/RxBle#Radio:   QUEUED RxBleRadioOperationDescriptorWrite(164719036)
02-23 08:46:36.452 2864-2888/com.company.android.ble D/RxBle#BluetoothGatt: onDescriptorWrite descriptor=00002902-0000-1000-8000-00805f9b34fb status=0
02-23 08:46:36.455 2864-3150/com.company.android.ble D/RxBle#Radio: FINISHED RxBleRadioOperationDescriptorWrite(248228237)
02-23 08:46:36.456 2864-3150/com.company.android.ble D/RxBle#Radio:  STARTED RxBleRadioOperationDescriptorWrite(164719036)
02-23 08:46:36.602 2864-3032/com.company.android.ble D/RxBle#BluetoothGatt: onDescriptorWrite descriptor=00002902-0000-1000-8000-00805f9b34fb status=0
02-23 08:46:36.616 2864-4250/com.company.android.ble D/RxBle#Radio:   QUEUED RxBleRadioOperationCharacteristicLongWrite(227542569)
02-23 08:46:36.623 2864-3150/com.company.android.ble D/RxBle#Radio: FINISHED RxBleRadioOperationDescriptorWrite(164719036)
02-23 08:46:36.624 2864-3150/com.company.android.ble D/RxBle#Radio:  STARTED RxBleRadioOperationCharacteristicLongWrite(227542569)
02-23 08:46:36.632 2864-2975/com.company.android.ble D/RxBle#BluetoothGatt: onCharacteristicWrite characteristic=69af0003-f994-3a57-749b-0e0aad3fca18 status=0
<more onCharacteristicWrites here, but omitted due to max post length>
02-23 08:46:36.897 2864-2975/com.company.android.ble D/RxBle#BluetoothGatt: onCharacteristicWrite characteristic=69af0003-f994-3a57-749b-0e0aad3fca18 status=0
02-23 08:46:36.902 2864-3150/com.company.android.ble D/RxBle#Radio: FINISHED RxBleRadioOperationCharacteristicLongWrite(227542569)
02-23 08:46:37.563 2864-3093/com.company.android.ble D/RxBle#BluetoothGatt: onCharacteristicChanged characteristic=69af0004-f994-3a57-749b-0e0aad3fca18
02-23 08:46:37.566 2864-5256/com.company.android.ble I/BLE_FW_WRITE: [FW_CHUNK_27] starting
02-23 08:46:37.567 2864-4250/com.company.android.ble D/BluetoothGatt: setCharacteristicNotification() - uuid: 69af0004-f994-3a57-749b-0e0aad3fca18 enable: false
02-23 08:46:37.569 2864-5256/com.company.android.ble D/BluetoothGatt: setCharacteristicNotification() - uuid: 69af0004-f994-3a57-749b-0e0aad3fca18 enable: true
02-23 08:46:37.572 2864-5256/com.company.android.ble D/RxBle#Radio:   QUEUED RxBleRadioOperationDescriptorWrite(150502697)
02-23 08:46:37.573 2864-3150/com.company.android.ble D/RxBle#Radio:  STARTED RxBleRadioOperationDescriptorWrite(150502697)
02-23 08:46:37.574 2864-4250/com.company.android.ble D/RxBle#Radio:   QUEUED RxBleRadioOperationDescriptorWrite(128172508)
02-23 08:46:37.711 2864-2888/com.company.android.ble D/RxBle#BluetoothGatt: onDescriptorWrite descriptor=00002902-0000-1000-8000-00805f9b34fb status=0
02-23 08:46:37.715 2864-4250/com.company.android.ble D/RxBle#Radio:   QUEUED RxBleRadioOperationCharacteristicLongWrite(58981097)
02-23 08:46:37.730 2864-3150/com.company.android.ble D/RxBle#Radio: FINISHED RxBleRadioOperationDescriptorWrite(150502697)
02-23 08:46:37.730 2864-3150/com.company.android.ble D/RxBle#Radio:  STARTED RxBleRadioOperationDescriptorWrite(128172508)
02-23 08:46:37.871 2864-3093/com.company.android.ble D/RxBle#BluetoothGatt: onDescriptorWrite descriptor=00002902-0000-1000-8000-00805f9b34fb status=0
02-23 08:46:37.876 2864-3150/com.company.android.ble D/RxBle#Radio: FINISHED RxBleRadioOperationDescriptorWrite(128172508)
02-23 08:46:37.879 2864-3150/com.company.android.ble D/RxBle#Radio:  STARTED RxBleRadioOperationCharacteristicLongWrite(58981097)
02-23 08:46:37.891 2864-3073/com.company.android.ble D/RxBle#BluetoothGatt: onCharacteristicWrite characteristic=69af0003-f994-3a57-749b-0e0aad3fca18 status=0
<more onCharacteristicWrites here, but omitted due to max post length>
02-23 08:46:38.126 2864-3073/com.company.android.ble D/RxBle#BluetoothGatt: onCharacteristicWrite characteristic=69af0003-f994-3a57-749b-0e0aad3fca18 status=0
02-23 08:46:38.128 2864-3150/com.company.android.ble D/RxBle#Radio: FINISHED RxBleRadioOperationCharacteristicLongWrite(58981097)

正如你所看到的，在最后我没有得到

代码语言：javascript
复制
onCharacteristicChanged characteristic=69af0004-f994-3a57-749b-0e0aad3fca18

在最后。

注意: writeData在Scheduler.io()线程中运行，I正在使用库中的最新主提交(https://github.com/Polidea/RxAndroidBle/commit/37ecef5c270c792bcb9193f6dd76b8711642e0ff) (因为我需要新的LongWriteBuilder)

有趣的是，如果我启动了一个额外的“虚拟”通知，可以观察到它什么也不做：

代码语言：javascript
复制
mBleConnection
            .flatMap(rxBleConnection -> rxBleConnection.setupNotification(LISTEN_UUID))
            .flatMap(notificationObservable -> notificationObservable)
            .subscribe(Actions.empty(), Actions.empty())

以上可观察到的作品，我收到每一个通知。

我怀疑我在设置通知时做错了什么，或者我在某个地方错过了一个延迟。

android
bluetooth-lowenergy
android-bluetooth
rx-android
rxandroidble
EN

回答 1

Stack Overflow用户

回答已采纳

发布于 2017-02-23 09:59:43

有两件事：

  • 不能保证收到通知-指示是
  • 从没有调用BluetoothGattCallback.onCharacteristicChanged()的日志上判断，安卓操作系统似乎无法反复设置通知。

潜在的解决方案是在第一个writeData(byte[] _payload)开始之前设置通知，并同时传递_payload和Observable<byte[]>，这样看起来就像writeData(byte[] _payload, Observable<byte[]> listenCharacteristicNotifications)。然后，您可以在LISTEN_CHARACTERISTIC_UUID上设置一次通知，并将其用于每次写入。

票数 1
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/42410228

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