how to keep socket connection alive in android

Establishing a TCP connection first requires a . How about saving the world? I've created a Closed callback to try and detect when the socket goes away: We noticed that while you have a Veritas Account, you aren't yet registered to manage cases and use chat. How can I keep a socket connection alive in the background in React Native? Not the answer you're looking for? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. For the Username field, use {iotHub-hostname}/{device-id}/?api-version=2021-04-12, where {iotHub-hostname} is the full CName of the IoT hub. Generic Doubly-Linked-Lists C implementation. If they are set lower than normal TCP data retransmission settings, and there is packet loss, then decreasing the TCP keepalive interval may expose connections to an increased risk of connection drop due to failure to receive at least one TCP keepalive acknowledgement. In reality, the SDK sends a ping request four times per keep-alive duration set. If this number is above 255, then it is adjusted to 255. not closed as before, but kept open after sending the response. ("Socket keep alive: "+ sock.getKeepAlive()); . How to combine several legends in one frame? The Keep-Alive general header allows the sender to hint about how the connection may be used to set a timeout and a maximum amount of requests. b. What exactly does a "persistent connection" mean? To query the status of this socket option, call the getsockopt function. The default number of keep-alive probes varies based on the version of Windows. If authenticating with username and password, set the username to .azure-devices.net/{device_id}/{module_id}/?api-version=2021-04-12 and use the SAS token associated with the module identity as your password. This error is returned if the socket descriptor passed in the, Windows2000 Professional [desktop apps only]. The SO_KEEPALIVE option for a socket is disabled (set to FALSE) by default. You can find this certificate in the Azure-iot-sdk-c repository. For TCP, the default keep-alive timeout is 2 hours and the keep-alive interval is 1 second. In Java InetSocketAddress creates a socket address from a hostname and a port number.We call it as server socket in Java. The number of keep-alive probes is set to the larger of the two registry key values. By using service you can achieve this, move all your network connection code into service, for all activities that want to use socket connection, bind your network service in onCreate () then after finish unbind it in onDestory () Share. Most of the rest of Internet client-server protocols (HTTP, Telnet, SSH, SMTP) are layered on top of TCP. how to set power manager wake lock with the following rules. Using the bindService () you can bind your Activities in onResume () or onStart () and let your service close the connection and stop itself when there is no client bound on it. Connect and share knowledge within a single location that is structured and easy to search. How to detect when an Android app goes to the background and come back to the foreground. If this number is 0, then keep-alive probes will not be sent. Internet is often called "TCP/IP" network. Code Review Stack Exchange is a question and answer site for peer programmer code reviews. Find centralized, trusted content and collaborate around the technologies you use most. 230 seconds later, the device misses the keep-alive ping because it's offline. ], ack 5549, win 335, length 015:52:24.408861 IP 192.168.1.12.1556 > 192.168.1.15.48070: Flags [. rev2023.4.21.43403. Did the Golden Gate Bridge 'flatten' under the weight of 300,000 people in 1987? Parabolic, suborbital and ballistic trajectories all follow elliptic paths. ], ack 5737, win 357, length 015:53:39.578808 IP 192.168.1.12.1556 > 192.168.1.15.54052: Flags [. ServerEventArgs Event args class holding server details, MyTcpClient class is shown below, which will do following tasks, a. Expose methods to start and stop communication with server. 1.0 and 1.1: HTTP 1.0 The HTTP 1.0 specification does not really delve into how As JakeGould suggested you can try Server Fault or. in java, I can set the power manager to keep a socket connection alive like following PowerManager.WakeLock newWakeLock = ( (PowerManager) getSystemService ("power")).newWakeLock (1, "Socket:WakeLock"); also with wifi WifiManager.WifiLock createWifiLock = ( (WifiManager). Thu Jul 7 15:51:40 CDT 2022tcp 0 0 192.168.1.15:48070 192.168.1.12:1556 ESTABLISHED 11826/vnetd keepalive (43.23/0/0)tcp 1 0 192.168.1.15:54052 192.168.1.12:1556 CLOSE_WAIT 20056/bptestbpcd keepalive (43.23/0/0)tcp 0 0 192.168.1.15:54336 192.168.1.12:1556 ESTABLISHED 11826/vnetd keepalive (43.23/0/0)Thu Jul 7 15:51:51 CDT 2022tcp 0 0 192.168.1.15:48070 192.168.1.12:1556 ESTABLISHED 11826/vnetd keepalive (33.19/0/0)tcp 1 0 192.168.1.15:54052 192.168.1.12:1556 CLOSE_WAIT 20056/bptestbpcd keepalive (33.19/0/0)tcp 0 0 192.168.1.15:54336 192.168.1.12:1556 ESTABLISHED 11826/vnetd keepalive (33.19/0/0)Thu Jul 7 15:52:01 CDT 2022tcp 0 0 192.168.1.15:48070 192.168.1.12:1556 ESTABLISHED 11826/vnetd keepalive (23.16/0/0)tcp 1 0 192.168.1.15:54052 192.168.1.12:1556 CLOSE_WAIT 20056/bptestbpcd keepalive (23.16/0/0)tcp 0 0 192.168.1.15:54336 192.168.1.12:1556 ESTABLISHED 11826/vnetd keepalive (23.16/0/0)Thu Jul 7 15:52:11 CDT 2022tcp 0 0 192.168.1.15:48070 192.168.1.12:1556 ESTABLISHED 11826/vnetd keepalive (13.13/0/0)tcp 1 0 192.168.1.15:54052 192.168.1.12:1556 CLOSE_WAIT 20056/bptestbpcd keepalive (13.13/0/0)tcp 0 0 192.168.1.15:54336 192.168.1.12:1556 ESTABLISHED 11826/vnetd keepalive (13.13/0/0)Thu Jul 7 15:52:21 CDT 2022tcp 0 0 192.168.1.15:48070 192.168.1.12:1556 ESTABLISHED 11826/vnetd keepalive (3.09/0/0)tcp 1 0 192.168.1.15:54052 192.168.1.12:1556 CLOSE_WAIT 20056/bptestbpcd keepalive (3.09/0/0)tcp 0 0 192.168.1.15:54336 192.168.1.12:1556 ESTABLISHED 11826/vnetd keepalive (3.09/0/0). Control data (like the phone number) must transit over the network. When the app is in foreground, every thing works fine but when the app state changes to background/inactive, location is being tracked but the socket disconnects after some time & I am not able to reconnect it again. Send TCP Keepalives more frequently and detect loss of the remote endpoint within 15 minutes. {property-bag} contains url-encoded key/value pairs of message properties. The twin GET and PATCH topics are identical for modules and devices. keeping connection alive for long times. overhead of rapidly creating and closing socket connections for each Overview Guides Reference Samples Design & Quality. When With keep-alive, the above becomes. Then the timer elapsed event will fire again though the first elapsed event is not yet finished. Note: Decreasing the TCP Keepalive interval sufficiently will also prevent idle socket timeout. For example, if the name of your IoT hub is contoso.azure-devices.net and if the name of your device is MyDevice01, the full Username field should contain: contoso.azure-devices.net/MyDevice01/?api-version=2021-04-12. Basically, browsers that support Keep-Alive The requestConnection method gets from the manager a pool of connections for a specific route to connect to. Most NetBackup tasks complete within seconds, most jobs within a few minutes or perhaps an hour. If the connect function was called asynchronously, then this requires waiting for the connection completion before trying to set the SO_KEEPALIVE socket option. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? For example: As for property updates, null values mean that the JSON object member is being deleted. Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. How about saving the world? We can then open a socket in the OS API to represent that connection, and we can treat that socket as a file descriptor (literally an FD in Unix, very similar to file HANDLE in Windows). Chrome and Use MathJax to format equations. For example: @good_evening That's an old question, back than such question were okay. Dialog throwing "Unable to add window token null is not for an application with getApplication() as context, TCP loopback connection vs Unix Domain Socket performance. Use devices/{device-id}/modules/{module-id}/# as a topic for receiving messages. Content-Length: in HTTP). How do I debug error ECONNRESET in Node.js? For higher android versions, I couldn't find a way to keep the socket connection alive for as long as I want. If a device app publishes a message with QoS 2, IoT Hub closes the network connection. ], ack 5549, win 335, length 0Above, the last two TCP segments containing application data (length >0) and the TCP ACK for each of them.Here, all connections are idle for tcp_keepalive_time = 75 seconds.Below, the local TCP sends a TCP Keepalive on each connection and the remote TCP replies with a TCP ACK.15:52:24.314806 IP 192.168.1.15.54052 > 192.168.1.12.1556: Flags [. Did the Golden Gate Bridge 'flatten' under the weight of 300,000 people in 1987? The IoT MQTT Sample repository, contains C/C++, Python, and CLI samples that show you how to send telemetry messages, receive cloud-to-device messages, and use device twins without using the Azure device SDKs. I'm calling Connect() for the first time I connect, I am then checking if the connection is still connected every 10 seconds if it is not connected it attempts to re-connect. I feel that what I have coded above could be improved a lot. The twin status topic is identical for modules and devices. Client on Node.js: Uncaught ReferenceError: require is not defined. In order to ensure a client/IoT Hub connection stays alive, both the service and the client regularly send a keep-alive ping to each other. In cloud-to-device messages, values in the property bag are represented as in the following table: The following example shows a property bag that contains three application properties: prop1 with a value of null; prop2, an empty string (""); and prop3 with a value of "a string". Keep-Alive should work. In order to avoid this stop the timer in the begin of Connect() and start the timer in end of Connect(). ], ack 3943, win 192, length 015:53:39.578847 IP 192.168.1.15.54336 > 192.168.1.12.1556: Flags [. By using service you can achieve this, move all your network connection code into service, for all activities that want to use socket connection, bind your network service in onCreate() then after finish unbind it in onDestory(). wildcards for filtering of subtopics. I don't get who ultimately decides when the connection closes. in HTTP/2 and So I must be missing something and this answer offers no insight into the required machanics. I suppose another example would be that you log into a website and it saves your credentials so you don't have to keep logging in every time you go to it. If you're using the device SDKs, switching from using AMQP to MQTT requires changing the protocol parameter in the client initialization, as stated previously. @TechnikEmpire: please read the HTTP spec, particularly, Thanks, yes, I understand this. Looking for job perks? The advantage of KeepAlive is that establishing a connection is expensive. Note: Set the Connection header to "keep-alive" for this header to have any effect. Bottom line,, no 'need' to use a service if you're only on one Activity (although it's always good to separate your business logic from Activities), Android Socket.IO best practices for keeping connection alive, https://developer.android.com/guide/components/bound-services. Was Aristarchus the first to propose heliocentrism? Run regedit to edit the Windows Registry key located in the path HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Tcpip\Parameters. To learn how to specify the MQTT and MQTT over WebSockets protocols when using the Azure IoT SDKs, see Using the device SDKs. Socket library with Non blocking IO and Simple IO is a very big topic. Keep alive means you don't hang up the phone and either of you just talk whenever you have something to talk about. Is it safe to publish research papers in cooperation with Russian academics? The confusion arises from distinction between packet-oriented and stream-oriented connections. This time though, it executed the USER_TIMEOUT code path, which decided to terminate the connection immediately. You can also specify MQTT over WebSockets in the client protocol parameter. the client sends another request, it reuses the same connection. Can my creature spell be countered if I cast a split second spell after it? I think it's appropriate, similar questions have been asked before. Any environment that is experiencing network connection drops.Older (pre-6.5)versions of NetBackup with clustered media servers may experience this problem if there is a hardware or software fault and the cluster fails over to the passive node. Backup generates Status 40 in Activity Monitor and Status 150 on the client. Asking for help, clarification, or responding to other answers. Alternatively, the server may send a delimiter to specify the end of the response - it all depends on the protocol above TCP. I have a kind of tracking app, which tracks the users for 8-10 hours depending on their shift so I am not able to make a stable socket connection for that long or not even able to reconnect when got disconnected in background. Does a password policy with a restriction of repeated characters increase security? For more information about the format of the property bag, see Sending device-to-cloud messages. If the TCP keepalive retry configuration is set too low/short, additional failure symptoms are possible such as status 13, status 14, status 24, status 42, status 44, or status 636. Not the answer you're looking for? Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. In the CONNECT packet, the device should use the following values: For the ClientId field, use the deviceId. ], ack 4530, win 259, length 0Here, all connections are again idle for tcp_keepalive_time = 75 seconds.15:53:39.578785 IP 192.168.1.15.54052 > 192.168.1.12.1556: Flags [. Why does Acts not mention the deaths of Peter and Paul? Visit Mozilla Corporations not-for-profit parent, the Mozilla Foundation.Portions of this content are 19982023 by individual mozilla.org contributors. How a top-ranked engineering school reimagined CS curriculum (Ep. At the low level (IP, Internet Protocol) the Internet is packet-oriented. As a result your exception handling logic might require some changes. Typically the application program at each end of the network connection should be setting the SO_KEEPALIVE option on the socket, so the operating system on each host should be sending TCP Keepalives at the configured interval. It only takes a minute to sign up. I think the best approach is to use a bound Service that autostarts. In order to establish a TLS connection, you may need to download and reference the DigiCert Baltimore Root Certificate. Can you still use Commanders Strike if the only attack available to forego is an attack against an ally? What does "Smote their breasts" signify in Luke 23:48? Socket needs to stay open/connected when app is open, There is one exception where socket needs to stay open while app is not open. How to stop EditText from gaining focus when an activity starts in Android? This parameter should point to buffer equal to or larger than the size of a DWORD value. Without a keep-alive, every HTTP request has to establish a new TCP connection, and then close the connection once the response has been sent/received. For more information, see. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? The message has the iothub-MessageType property with a value of Will assigned to it. You can create this file by copying the certificate information from certs.c in the Azure IoT SDK for C. Include the lines -----BEGIN CERTIFICATE----- and -----END CERTIFICATE-----, remove the " marks at the beginning and end of every line, and remove the \r\n characters at the end of every line. Firefox ignore them in HTTP/2 responses, but Safari conforms to the HTTP/2 The fewer times you have to perform those steps between a given client/server pair, the faster HTTP requests can be sent and responded to. Since it's tcp-keep alive, I never get nor send an EOF. @HyopeR No, It doesn't last longer in some devices, but in android 8 and lower, socket connection doesn't break. After a subscription has been established, the device receives cloud-to-device messages that were sent to it after the time of the subscription. Would you ever say "eat pig" instead of "eat pork"? Keep-alive exemplifies The Law of Leaky Abstractions. If the operation completes successfully, setsockopt returns zero. The Keep-Alive general header allows the sender to hint about how the connection may be used to set a timeout and a maximum amount of requests. * Caution: When decreasing the TCP Keepalive interval, be sure to review the keepalive retry interval and retry count; the latter may need to be increased. Has the cause of a rocket failure ever been mis-identified, such that another launch failed due to the same problem? ], ack 5737, win 357, length 015:52:24.314830 IP 192.168.1.12.1556 > 192.168.1.15.54052: Flags [. The default system-wide value of the keep-alive interval is controllable through the KeepAliveInterval registry setting which takes a value in milliseconds. In situations like those above, NetBackup has a controlling process and connection waiting for return status while other processes and connections on other hosts complete the tasks for the job. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. If a device sends a message with the RETAIN flag set to 1, IoT Hub adds the mqtt-retain application property to the message. TCP Keepalive Best Practices - detecting network drops and preventing idle socket timeout. Connect and share knowledge within a single location that is structured and easy to search. Looking for job perks? Making statements based on opinion; back them up with references or personal experience. Typically the application program at each end of the network connection should be setting the SO_KEEPALIVE option on the socket, so the operating system on each host should be sending TCP Keepalives at the configured interval. Looking into old unanswered questions and found this one. It's recommended to include api-version in the field. How a top-ranked engineering school reimagined CS curriculum (Ep. For a tutorial on using MQTT directly, see Use MQTT to develop an IoT device client without using a device SDK. That is what makes the connection "persistent". According to what I understood, if I spend more time . To subscribe to this RSS feed, copy and paste this URL into your RSS reader. However, on top of IP we have TCP (Transmission Control Protocol). In other words, the SDK sends a keep-alive ping once every 75 seconds. The device doesn't receive any messages from IoT Hub until it has successfully subscribed to its device-specific endpoint, represented by the devices/{device-id}/messages/devicebound/# topic filter. This works fine for desktop browsers, But on all mobile browsers, whenever user's page is not in focus, i.e if a user minimizes the browser, opens a new app, or goto select file upload screen, socket io times out after 30 seconds or sometimes even faster then this. New clients and servers can keep it open. To learn more, see our tips on writing great answers. For more information, see the System properties section of IoT Hub message routing query syntax. The client may then re-use the same TCP connection to send its next request. What should be the architecture to send real-time alerts/locations from a mobile app in every app state to the backend nodejs server? That's what I didn't quite understand, why TCP connection is difficult to create. MyTCPWrapper class is show below, which will do the following. In this case, instead of persisting the retain message, IoT Hub passes it to the backend app. Counting and finding real solutions of an equation, Generic Doubly-Linked-Lists C implementation. The multi-level wildcard # in the Topic Filter is used only to allow the device to receive more properties in the topic name. Looking for job perks? This is a very simple free Java Utility which tells you if you could establish a socket connection to different hosts on specific ports. @JakeGould: Thanks for edit. Looking for job perks? The size, in bytes, of the optval buffer. The device app should use devices/{device-id}/messages/events/ or devices/{device-id}/messages/events/{property-bag} as the Will topic name to define Will messages to be forwarded as a telemetry message. Sorted by: 1. Above, the second field in the keepalive counters did not increment from 0 to 1.This indicate thatTCP replies werereceived and the connections are still connected host-to-host.If not connected, replies would not have been received, and the retransmit fields would have incremented.If max retransmissions are sent without receiving a reply, the connection is dropped/reset by the kernel. The slight disadvantage may be that the server now has to tell the client where the response ends. Device SDKs that support the MQTT protocol are available for Java, Node.js, C, C#, and Python. I am using the nRf8001 and successfully connecting to an android device, but I still have some doubts related to the BLE protocol itself, specifically to the connection interval.
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how to keep socket connection alive in android 2023