For TCP, the SO_KEEPALIVE socket option should be set either before the connect function (connect, ConnectEx, WSAConnect, WSAConnectByList, or WSAConnectByName) is called, or after the connection request is actually completed. Difference between Session, HTTP Connection? You can find more information here https://developer.android.com/guide/components/bound-services. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. MQTT v3.1.1 over WebSocket on TCP port 443. Socket library with Non blocking IO and Simple IO is a very big topic. If your back-end app needs to receive a response from the device app, consider using direct methods. 1 Answer. In the side bar, expand the Devices node under the Azure IoT Hub section. For example, a device using the Java SDK sends the keep-alive ping, then loses network connectivity. How about saving the world? The format of these attributes are protocol-specific. Here is the method I use to determine if the socket is fully connected to the server. So I must be missing something and this answer offers no insight into the required machanics. For more information about routing messages either based on message properties or message body, see the IoT Hub message routing query syntax documentation. A persistent connection also reduces the number of TCP and SSL/TLS connection requests, leading to a drop in round trip time (RTT). English version of Russian proverb "The hedgehogs got pricked, cried, but continued to eat the cactus". IoT Hub only supports one active MQTT connection per device. The level at which the option is defined. Once the master server O/S detects the socket is no longer valid, an error indication is provided to nbjm, the job fails and become eligible for retry. A device sends a message that contains the device twin update to the $iothub/twin/PATCH/properties/reported/?$rid={request-id} topic. A minor scale definition: am I missing something? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Note that the Ws2def.h header file is automatically included in Winsock2.h, and should never be used directly. For the Password field, use a SAS token. ], ack 4530, win 259, length 0repeat every 75 seconds until the application either sends data or closes the connections. As a result your exception handling logic might require some changes. Are HTTP keep-alive connections possible without content-length headers? If the device connects with CleanSession flag set to 0, the subscription is persisted across different sessions.
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