[英]RxAndroidBle waiting for response from peripheral when write on it (not long write) in Kotlin
我正在嘗試使用 RxAndroidBle 寫入 Android Kotlin中的外圍設備。 應用程序向外設寫入,如果此寫入請求成功,則外設響應,即根據對發送給外設的信息所做的評估,如果是預期的信息,則外設向應用程序發送響應,如果不是預期的信息,然后外設以不同的響應響應; 綜上所述,這是一個非常類似於通過POST請求HTTP的場景,發送信息,如果信息滿足要求,服務器響應一個狀態。 我已經設法完美連接並通過以下方式從外圍設備讀取信息:
override fun connectDeviceToGetInfoHardwareByBle(mac: String): Observable<Resource<HardwareInfoResponse>> {
val device: RxBleDevice = bleClient.getBleDevice(mac)
return Observable.defer {
device.bluetoothDevice.createBond()// it is a blocking function
device.establishConnection(false) // return Observable<RxBleConnection>
}
.delay(5, TimeUnit.SECONDS)
.flatMapSingle { connection ->
connection.requestMtu(515)
.flatMap {
Single.just(connection)
}
}
.flatMapSingle {
it.readCharacteristic(UUID.fromString(GET_HARDWARE_INFORMATION_CHARACTERISTIC))
.map { byteArray ->
evaluateHardwareInfoResponse(byteArray = byteArray)
}
}
.map {
Resource.success(data = it)
}
.take(1)
.onErrorReturn {
Timber.i("Rointe Ble* Error getting ble information. {$it}")
Resource.error(data = null, message = it.message.toString())
}
.doOnError {
Timber.i("Rointe Ble*","Error getting ble information."+it)
}
.subscribeOn(ioScheduler)
.observeOn(uiScheduler)
}
如您所見,外圍設備需要MTU,它滿足了我的需求。 在該響應之后,我關閉了 BLE 連接,應用程序在 .network (HTTP) 上執行另一項獨立工作。 然后需要再次連接,但這次需要向外設寫入 JSON 信息,設備會分析 JSON 並給出我需要的一些答案作為回報; 如何實現寫入等待外圍設備的響應? 是否有必要為 JSON 進行長寫,因為我在連接上分配了 MTU? 我在 Kotlin 中在 Repository 模式下開發這個。
發送的JSON是這樣的:
{
"data": {
"id_hardware": "[ID_HARDWARE]",
"product_brand": <value>,
"product_type": <value>,
"product_model": <value>,
"nominal_power": <value>,
"industrialization_process_date": <value>,
"platform_api_path": "[Host_API_REST]",
"platform_streaming_path": "[Host_STREAMING]",
"updates_main_path": "[Host_UPDATES]",
"updates_alternative_path": "[Host_ALTERNATIVE_UPDATES]",
"check_updates_time": <value>,
"check_updates_day": <value>,
"auth_main_path": "[Host_AUTHORIZATION]",
"auth_alternative_path": "[Host_BACKUP_AUTHORIZATION]",
"analytics_path": "[Host_ANALYTICS]",
"idToken": "[ID_TOKEN]",
"refreshToken": "[REFRESH_TOKEN]",
"expiresIn": "3600",
"apiKey": "[API_KEY]",
"factory_wifi_ssid": "[FACTORY_WIFI_SSID]",
"factory_wifi_security_type": "[FACTORY_WIFI_TYPE]",
"factory_wifi_passphrase": "[FACTORY_WIFI_PASS]",
"factory_wifi_dhcp": 1,
"factory_wifi_device_ip": "[IPv4]",
"factory_wifi_subnet_mask": "[SubNetMask_IPv4]",
"factory_wifi_gateway": "[IPv4]"
},
"factory_version": 1,
"crc": ""
}
外設解析JSON,根據發來的JSON給我一些答案。
現在,我嘗試編寫期望響應的方式是這樣的:
private fun setupNotifications(connection: RxBleConnection): Observable<Observable<ByteArray>> =
connection.setupNotification(UUID.fromString(SET_FACTORY_SETTINGS_CHARACTERISTIC))
private fun performWrite(connection: RxBleConnection, notifications: Observable<ByteArray>, data: ByteArray): Observable<ByteArray> {
return connection.writeCharacteristic(UUID.fromString(SET_FACTORY_SETTINGS_CHARACTERISTIC), data).toObservable()
}
override fun connectDeviceToWriteFactorySettingsByBle(mac: String, data: ByteArray): Observable<Resource<HardwareInfoResponse>> {
val device: RxBleDevice = bleClient.getBleDevice(mac)
return Observable.defer {
//device.bluetoothDevice.createBond()// it is a blocking function
device.establishConnection(false) // return Observable<RxBleConnection>
}
.delay(5, TimeUnit.SECONDS)
.flatMapSingle { connection ->
connection.requestMtu(515)
.flatMap {
Single.just(connection)
}
}
.flatMap(
{ connection -> setupNotifications(connection).delay(5, TimeUnit.SECONDS) },
{ connection, deviceCallbacks -> performWrite(connection, deviceCallbacks, data) }
)
.flatMap {
it
}
//.take(1) // after the successful write we are no longer interested in the connection so it will be released
.map {
Timber.i("Rointe Ble: Result write: ok ->{${it.toHex()}}")
Resource.success(data = evaluateHardwareInfoResponse(it))
}
//.take(1)
.onErrorReturn {
Timber.i("Rointe Ble: Result write: failed ->{${it.message.toString()}}")
Resource.error(data = HardwareInfoResponse.NULL_HARDWARE_INFO_RESPONSE, message = "Error write on device.")
}
.doOnError {
Timber.i("Rointe Ble*","Error getting ble information."+it)
}
//.subscribeOn(ioScheduler)
.observeOn(uiScheduler)
}
可以看出,MTU 協商為最大值並發送單個數據包(顯示的 json 文件)。
當我運行我的代碼時,它連接但顯示此錯誤:
com.polidea.rxandroidble2.exceptions.BleCannotSetCharacteristicNotificationException:找不到具有特征 UUID 4f4a4554-4520-4341-4c4f-520001000002 的客戶端特征配置描述符(代碼 2)
Kotlin 有幫助嗎?
非常感謝!!
當我運行我的代碼時,它連接但顯示此錯誤:
com.polidea.rxandroidble2.exceptions.BleCannotSetCharacteristicNotificationException:找不到具有特征 UUID 4f4a4554-4520-4341-4c4f-520001000002 的客戶端特征配置描述符(代碼 2)
您可以通過兩種方式解決此問題:
COMPAT
模式如何清理UUID的特征緩存? 發生的事情是庫在緩存中記住可能是最后注冊的 UUID。 我如何清理這個緩存?
可以使用BluetoothGatt#refresh
清除緩存,然后獲取一組新的服務,這將允許繞過庫UUID
幫助程序——您需要使用接受BluetoothGattCharacteristic
而不是UUID
的函數。
刷新BluetoothGatt
的代碼:
RxBleCustomOperation<Void> bluetoothGattRefreshCustomOp = (bluetoothGatt, rxBleGattCallback, scheduler) -> {
try {
Method bluetoothGattRefreshFunction = bluetoothGatt.getClass().getMethod("refresh");
boolean success = (Boolean) bluetoothGattRefreshFunction.invoke(bluetoothGatt);
if (!success) return Observable.error(new RuntimeException("BluetoothGatt.refresh() returned false"));
return Observable.<Void>empty().delay(500, TimeUnit.MILLISECONDS);
} catch (NoSuchMethodException e) {
return Observable.error(e);
} catch (IllegalAccessException e) {
return Observable.error(e);
} catch (InvocationTargetException e) {
return Observable.error(e);
}
};
繞過庫緩存發現服務的代碼:
RxBleCustomOperation<List<BluetoothGattService>> discoverServicesCustomOp = (bluetoothGatt, rxBleGattCallback, scheduler) -> {
boolean success = bluetoothGatt.discoverServices();
if (!success) return Observable.error(new RuntimeException("BluetoothGatt.discoverServices() returned false"));
return rxBleGattCallback.getOnServicesDiscovered()
.take(1) // so this RxBleCustomOperation will complete after the first result from BluetoothGattCallback.onServicesDiscovered()
.map(RxBleDeviceServices::getBluetoothGattServices);
};
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