sockets | blocking TCP socket layer , with event-driven server | Socket library

 by   vapor-community Swift Version: 2.2.3 License: MIT

kandi X-RAY | sockets Summary

kandi X-RAY | sockets Summary

sockets is a Swift library typically used in Networking, Socket applications. sockets has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

At the request of the original authors, we ask you to please help us make the community a better place by abiding to this Code of Conduct during your interactions surrounding this project.
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              sockets has a low active ecosystem.
              It has 564 star(s) with 52 fork(s). There are 31 watchers for this library.
              OutlinedDot
              It had no major release in the last 12 months.
              There are 4 open issues and 50 have been closed. On average issues are closed in 98 days. There are no pull requests.
              It has a neutral sentiment in the developer community.
              The latest version of sockets is 2.2.3

            kandi-Quality Quality

              sockets has no bugs reported.

            kandi-Security Security

              sockets has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              sockets is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              sockets releases are available to install and integrate.

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            sockets Key Features

            No Key Features are available at this moment for sockets.

            sockets Examples and Code Snippets

            Can also create web sockets:
            mavendot img1Lines of Code : 23dot img1no licencesLicense : No License
            copy iconCopy
            AsyncHttpClient.getDefaultInstance().websocket(get, "my-protocol", new WebSocketConnectCallback() {
                @Override
                public void onCompleted(Exception ex, WebSocket webSocket) {
                    if (ex != null) {
                        ex.printStackTrace();
                         
            UNIX Domain Sockets
            npmdot img2Lines of Code : 2dot img2no licencesLicense : No License
            copy iconCopy
            /* Pattern */ 'http://unix:SOCKET:PATH'
            /* Example */ request.get('http://unix:/absolute/path/to/unix.socket:/request/path')
            
              

            Community Discussions

            QUESTION

            SLURM and Python multiprocessing pool on a cluster
            Asked 2021-Jun-15 at 13:42

            I am trying to run a simple parallel program on a SLURM cluster (4x raspberry Pi 3) but I have no success. I have been reading about it, but I just cannot get it to work. The problem is as follows:

            I have a Python program named remove_duplicates_in_scraped_data.py. This program is executed on a single node (node=1xraspberry pi) and inside the program there is a multiprocessing loop section that looks something like:

            ...

            ANSWER

            Answered 2021-Jun-15 at 06:17

            Pythons multiprocessing package is limited to shared memory parallelization. It spawns new processes that all have access to the main memory of a single machine.

            You cannot simply scale out such a software onto multiple nodes. As the different machines do not have a shared memory that they can access.

            To run your program on multiple nodes at once, you should have a look into MPI (Message Passing Interface). There is also a python package for that.

            Depending on your task, it may also be suitable to run the program 4 times (so one job per node) and have it work on a subset of the data. It is often the simpler approach, but not always possible.

            Source https://stackoverflow.com/questions/67975328

            QUESTION

            Send data using over bluetooth using different protocols
            Asked 2021-Jun-14 at 18:48

            I have an app that communicates with a bluetooth device, and I'm trying to replace that app with some code.

            I tried using C# InTheHand nuget, Microsoft's Bluetooth LE Explorer, python's sockets and others to send data and see what happens.

            But there's something I still don't understand - in each way using different libraries I saw in wireshark a different protocol: ATT, RFCOMM, L2CAP...

            When I sniffed my bluetooth traffic from my phone using the app mentioned before, I saw mostly HCI_CMD protocol traffic.

            How can I choose the protocol I want to send? Is there a simple package for that? something to read?

            Do I need to build the packet myself? including headers and such?

            Thank you!

            Update: Using Microsoft's Bluetooth LE Explorer I was able to send a packet that lit up my lamp, starting with 02010e10000c00040012(data)
            Using bleak I was able to send a packet starting with 02010e10000c00040052(data)
            the difference makes the lamp not ligh up and I'm not sure if I can change it via bleak as it's not part of the data I send

            ...

            ANSWER

            Answered 2021-Jun-14 at 18:48

            I think what you are showing is that bleak does a write without response while MS BLE Explorer does a write_with_response.

            Looking at the Bleak documentation for write_gatt_char that seems to be consistent as response is False by default

            write_gatt_char Parameters:

            • char_specifier (BleakGATTCharacteristic, int, str or UUID). The characteristic to write to, specified by either integer handle, UUID or directly by the BleakGATTCharacteristic object representing it.

            • data (bytes or bytearray) – The data to send.

            • response (bool) – If write-with-response operation should be done. Defaults to False.

            I would expect the following to have the desired effect:

            Source https://stackoverflow.com/questions/67961476

            QUESTION

            IO Completion port returning NULL Completion Key
            Asked 2021-Jun-14 at 14:36

            First time using IO Completion Ports. I'm having an issue where the GetQueuedCompletionStatus returns a Null for the Completion Key, which I am using to pass a data struct with handles for other portions of the code. The GetQueuedCompletionStatus seems to be triggering off messages received just fine otherwise.

            I tried to include just the code involving the IO Completion ports:

            The Data Structs:

            ...

            ANSWER

            Answered 2021-Jun-14 at 14:36

            Any Ideas why the IOCP is not passing the Completion Key?

            of course it passing back exactly what you pass to CreateIoCompletionPort and I/O in place pointer to OVERLAPPED

            but at first

            Source https://stackoverflow.com/questions/67964718

            QUESTION

            C# Winform : Error while trying to launch TCP client application
            Asked 2021-Jun-14 at 12:37

            I have a C# Winform application trying to launch a node server.

            However the code for this is written in a different cs file, Class1.cs rather than in Form.cs itself. I need to keep this separated in different files. Below is my Class1.cs file:

            ...

            ANSWER

            Answered 2021-Jun-12 at 20:11

            You should not mix direct member initialisation and constructor logic. This makes it hard to understand the code flow.

            This line declares a variable and initializes it:

            Source https://stackoverflow.com/questions/67949893

            QUESTION

            s.bind((hostIPAddress,22)) OSError: 99
            Asked 2021-Jun-14 at 12:25

            I am trying to get my robot to communicate with my PC via sockets by using local IP addresses on my own home network (not devices outside my network). The robot is acting as the server and my own PC is acting as the client/host. I don't really know what ports are open on my robot but I do definitely know that port 22 on the robot is open (which is the SSH port). The robot is a lego EV3 robot apart from it has had some ev3python software put onto it. When I run my program I am getting the following error on the server (my robot):

            ...

            ANSWER

            Answered 2021-Jun-14 at 12:24
            hostIPAddress = "xx.xx.xx.xx" #the local IP address of my PC on my home network 
            backlog = 1
            size = 1024
            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            s.bind((hostIPAddress,22))#22 is the port number I am using. (THIS IS ALSO THE LINE WHERE THE ERROR IS COMING FROM) 
            s.listen(backlog)
            

            Source https://stackoverflow.com/questions/67969893

            QUESTION

            Laravel Websockets reverse proxy port Nginx config to Apache virtual host
            Asked 2021-Jun-14 at 09:59

            I'm trying to deploy my Laravel Websockets application as part of my Laravel 8 API project. Everything works locally, but after deploying I'm unable to connect to port 6001 on my website's domain, which is a sub-domain.

            I'm using a Cent OS 8 server with Apache and already have port 80 open to my website on https://api.example.com/, and in order for my site on https://site.example.com/ I've gone ahead and created a sub-domain called https://api-socket.example.com/ and need to proxy this through to port 6001.

            The config for a Nginx server I've tried to replace as a virtual host but when I restart httpd I get a 521 error with Cloudflare, my config is:

            /etc/httpd/sites-available/api-socket.example.com.conf

            ...

            ANSWER

            Answered 2021-Jun-14 at 09:59

            Can you please give it a try without ssl to ensure the configuration works or not. Make sure following modules are enabled

            Source https://stackoverflow.com/questions/67967674

            QUESTION

            No visible @interface for ***** declares *****
            Asked 2021-Jun-12 at 18:25

            I am new to Objective-c. I am using swiftui to make my app. But need to implant objective-c code for BLE. all work until I get this code

            in .h file

            ...

            ANSWER

            Answered 2021-Jun-11 at 22:36

            Search your code for where the @interface for ESPTaskParameter is defined, that will be in some .h file. Then, make sure the .m file #imports that header file. If it doesn’t the there would indeed be no visible interface defining the selector you want to call to the .m file that is trying to call it

            And check that the interface .h does indeed declare a public setter for broadcast.

            Source https://stackoverflow.com/questions/67942671

            QUESTION

            NodeJS is running one script into another one
            Asked 2021-Jun-11 at 21:53

            I created a TCP server for receiving information from some devices, and I wanted to created an API out from this server, and I exported two variables in order to use them in the API. When I do that, my server starts in my other process, making that they execute at the same time, I don't know why this happens

            ...

            ANSWER

            Answered 2021-Jun-11 at 21:53

            Well socket objects in nodejs belong to a particular process. You can't just share them with another process easily. If you want one process to cause data to be sent on a socket the other process owns, then send the data itself to the other process using a different server and send some identifier with the data that the receiving process can use to figure out which socket the data should be sent to and it will then send the data over the socket it has. But, this whole thing sounds like a really confusing way to do things.

            For example, let's say you have serverTCP (the plain TCP server from your server.js) and serverAPI (an Express server from your other file) each in separate processes. Put a separate Express server in serverTCP running on a local port, not open to the outside world. When serverAPI receives some data for some socketID, it then makes an http request to serverTCP and sends the data and the socketID. serverTCP receives that http request, gets the socketID and the data out of that request and sends it out over the appropriate socket it has a connection to.

            FYI, this is generically known as a proxy where your API is somewhat serving as a proxy for the real socket connection. There are all sorts of modules in NPM that implement actual proxies too.

            Source https://stackoverflow.com/questions/67943001

            QUESTION

            Winsock2 c sokcet to a Javascript Websocket server
            Asked 2021-Jun-11 at 13:32

            I'm trying trying to send data from a c file using winsock2 compiled with Visual Studio to a WebSocket server in Javascript. But I didn't succeed in making them communicate on windows. As I'm not a c visual studio and socket expert, I don't understand why the C client does not send any data to my JS WebSocket server.

            Here are the two following "code" that I'm using. If you have some tips or a good ideas. Feel free to answer.

            C code

            ...

            ANSWER

            Answered 2021-Jun-11 at 13:32

            I found the problem! This javascript websocket was not adequate to the C socket. Thus, I tried the following Javascript code and it is workings as wanted !

            Source https://stackoverflow.com/questions/67886750

            QUESTION

            When to cleanup after socket deletion
            Asked 2021-Jun-10 at 16:01

            I am writing a small TCP sockets "library", and I ran into much trouble.

            When something happens to the socket that causes it to be instantly closed and freed (regardless of background lingering, talking about user space here), which is only done within a locked mutex since the application I'm writing is multi-threaded, I need a way to tell all the other (potentially) waiting threads (on the same mutex) that want to do something with the socket: "I'm terribly sorry, but the socket has been destroyed and you cannot access it" so that they don't cause any segmentation fault or such.

            The idea I had was: the mutex was part of the socket (socket = a structure that contains multiple things, including a mutex and a file descriptor) so I couldn't quite free the socket if other threads were waiting for it (undefined behavior), so the possible solution is to allocate the mutex, free the socket but not the mutex, set some flag (in the allocated memory) saying that the socket has been closed, and a counter so that the last thread waking up and getting notified that it cannot use the socket unlocks and destroys the mutex and frees the memory allocated. The mutex can still be accessed without segfault if we just store its pointer before acquiring the mutex (and the pointer won't ever change).

            This solution has a fundamental problem though - what if between unlocking the mutex and freeing it by the last holder, the thread gets preempted and another one locks the mutex again (since you NEED to check socket-related stuff after you acquire the lock, so no way of knowing it got destroyed, unless you maybe use an atomic variable but then again, checking the atomic variable and locking the mutex as a whole are not an atomic operation). Or if you try to access the mutex on the already-freed socket. Undefined behavior emerges.

            Any ideas how to solve this problem? I.e. how to destroy a socket so that other threads know about it to quit safely, and there are no race conditions? By quitting I mean aborting the socket function they were in, not cancelling or stopping the threads themselves.

            ...

            ANSWER

            Answered 2021-Jun-10 at 16:01

            I could not find a feasible solution of "auto-detecting" when the resources aren't in use (either some kind of a garbage collection, or a timeout since the last call made for that socket, e.g. if the application doesn't do anything with the socket for a minute after it closed, release its resources). That is why I decided to have some reference, look at other things dealing with the problem.

            The first very obvious was the kernel itself. If the socket closes, the kernel informs the application of it happening, but only cleans up the socket once the application calls close(). I think it really is the best way of dealing with this problem, nonetheless it adds some additional responsibility to the application.

            Source https://stackoverflow.com/questions/67889925

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network

            Vulnerabilities

            No vulnerabilities reported

            Install sockets

            You can download it from GitHub.

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