iot

My both publisher and subscriber are both connected to mosquitto (paho) broker with QOS=2 and maintaining persistent session by clean_session=false. When i publish message with subscriber connected to broker, it successfully received by subscriber, now if I disconnect the subscriber , then again publish message and connect subscriber after, I will be able to retrieve message those messages when my subscriber was offline. My question is -- Is there any storage in the broker which stores all the messages when subscriber is offline. If yes, how much long or how many message it can store. Is this

I am working on BLE Applications, I have tested with different devices like Nexus, Moto, Samsung, LG. I am getting the GATT Error 133 in Samsung Devices alone(Samsung A5 2016). Trying to connect 10 times it gets connected only 2 or 3 times.Please Help me out. 来源： https://stackoverflow.com/questions/40465373/android-ble-gatt-error-133-getting-often-with-samsung-devices

In our scenario, we have a bunch of devices that communicate locally with a gateway. The gateway is responsible to aggregate events from the devices and send it to the cloud. It should also receive device configuration changes from the the cloud and transport it to the specific device. Based on my reading I would think that this is actually a typical IoT Hub scenario. And we would very much like to use the device management, messaging and maybe even twins that IoT Hub provides. However, the way the devices communicate is already implemented and shall not be changed. That means the devices

I connect to a BLE device with the connectGatt() method in Android. This works great. When I disconnect I use the following: private void disconnectDevice() { gatt.disconnect(); } When I receive the callback I do a close. private BluetoothGattCallback gattCallback = new BluetoothGattCallback() { @Override public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) { switch (newState) { case BluetoothProfile.STATE_CONNECTED: Log.d("BLED-GATT", "STATE_CONNECTED"); setUIConnectionStatus("Discover services on device...", Color.YELLOW); checkEnableAddButton(simpleTrackEditText

https://qiita.com/sparkgene/items/425d310c1d6c9158f896 前回の記事では、Jetson Nano上でAWS IoT Greengrassを動かしました。 Jetson Nano Developer KitでAWS IoT Greengrassを動かしてみる 今回は、Jetson Nano上でMLの推論を試してみます。 Greengrassは事前に生成したMLのモデルを使って推論を実行する事が可能です。 AWS IoT Greengrass ML Inference 推論で使うモデルが必要になるので、今回はこちらの「 AWS マネジメントコンソール を使用して Machine Learning Inference を設定する方法 」を参考にしながら作業を進めます。 MXNetのインストール AWSのドキュメントではJetson TX2向けの手順やライブラリが有るのですが、Jetson NanoはCUDA10の為、そのまま使えません。 で、ソースからインストールやら色々ハマった結果、公式のフォーラムで解決策が提供されていたので、それを参考にインストールしました。 I was unable to compile and install MXNET on the jetson nano，Is there an official

I'm currently using ThingsBoard as an IoT broker to capture and display telemetry data from several sensors to a dashboard. I would like to add the capability of displaying a live video feed from a iPhone camera or webcam, and I'm wondering if anyone here knows if ThingsBoard supports any sort of video data stream (either live or timed screen capture based)? Ideally, I'd like to mount the phone/camera to a servo-controlled mount which I can used to position the camera using controls on the dashboard. 来源： https://stackoverflow.com/questions/54678942/video-feed-to-thingsboard-dashboard