Transmission Control Protocol (TCP) is a transport layer protocol that provides a connection-oriented data stream service with guaranteed, in-order delivery.

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Server connection handler in Python

I am working on a server for a smart house. This part of code is responsible for communication with client (separate application), sending requested data and ensuring everything is safe. I've decided ...
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Python 3 NetScanner Daemon

I’m pretty new to programming and python in particular. This is a simple ICMP/TCP scanner that dumps output to a terminal and/or csv file. My goal was to make a daemon that could do simple scanning ...
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Modbus connection over TCP and Serial port

I want to improve my code. In this code I don't like my contructor, but without it I keep getting an error while trying to connect NullPointerException.Any ...
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TCP client and server supporting six simple commands

For a class, I was given an assignment to code a simple TCP connection between a server and a client. Once the TCP handshake is done, the client sends inquiries to the server. It's a 2 second ...
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Common client server implementation

I have created a common C file for a basic client server. It works fine on my Linux setup. Please provide your comments/suggestions on how the code can be optimized/enhanced. After compiling we need ...
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Java NIO server Selector loop

I have a server that uses Java NIO in non-blocking mode. Right now I'm using a single thread for the selector, and four worker threads to process the bytes after ...
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MultiThreaded TCP Server with high CPU usage

I wrote simple C# TCP Server application and my program use a lot of cup, i was wondering anyone can review my code and would be grateful for any hints and suggestion. This is my code. ...
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Basic Server/Client Model built around ASIO

For this project, I'm using the non-Boost version of the ASIO library. The basic idea is that it is a relatively simple stand-alone class capable of functioning either as a server or client depending ...
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Adds digital signature to outgoing TCP packet

The code connects multiple clients to a server using TCP sockets asynchronously. I have added code to attach a digital signature to the outgoing messages from the server, to authenticate the message ...
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Aync await TCP Server for concurrent connection [closed]

I have to write asynchronous TCP Server on to which multiple GPS Devices will be connecting simultaneously (Count :- 1000 Approx) and will push some data of size less than 1 Kb on server, In the ...
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73 views

TCP connection pool

I am looking for any feedback on my connection pool implementation (I removed the documentation so this post isn't so bloated). The pool times-out idle connections after a certain timeout interval ...
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Reading and Writing Messages from a Socket

This is code from my android client which communicates over wifi to a small server program (not coded in java). This is my first time playing around with sockets, so I'm sure there are lots of little ...
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Probe for open application on a TCP port

I need to examine an application port to see if it opens and I need to put the retry count as a parameter. Since I'm new to Node I wanted to get your feedback on it for improvements. ...
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Simple TCP client-server solution

I have implemented a simple client-server solution using Java sockets and useful classes from java.util.concurrent. The communication protocol is rather simple: ...
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Design watchdog, reconnecting to server

I have console application that sends and process XML data. I have created a fault mechanism that the connection drops. I go in a "fault" mode. And try to reconnect to my server. I'm sending ...
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2answers
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Xml messages processing networkstream [closed]

I'm currently processing xml messages with C#. It is working But I'm not confident that my code is fast enough. There are 3 possible messages I can receive. When I receive one the message an event is ...
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1answer
156 views

ISO8583 encoding data fields

I just want to confirm that my ISO8583 format is correct. Example: For the data field 35, the length of the data is 36, so I put 36 before the 4842. Then all the data is inserted in a string (...
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369 views

Simple TCP client in Rust

Here's a little command-line utility written in Rust that connects to a Denon AV receiver and sends a command, then receives the response. It's a simple TCP client that takes its command from the ...
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322 views

Python TCP echo server

The below code is a simple TCP echo server. The folks using it claim "it is going down every now and again". Any thoughts on how this could be improved would be really appreciated, particularly if ...
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95 views

Scanning for open ports

I made what started out as a web browser but now is a scanner for open ports. I wanted to know if you think this is a realistic or a unreliable tool for port testing. I found some open ports on my ...
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Asynchronously accepting multiple client connections without impacting main thread

I am implementing a multi-player game in C# and having seen all sorts of projects, from indie developers all the way to large studios struggle to patch networking into existing products in the past, ...
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TCP Socket Wrapper

I'm trying to build a simple server software for training purpose, most likely a IRC server, but I'm not there yet. I'm currently implementing a TCP socket class, to ease the use of the C socket API. ...
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Simple webserver in C

My first learning project in C. Looking for general feedback e.g. gotchas, coding standards, formatting, naming etc. I'm here to learn! webserver.h ...
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331 views

TCP Tunnel in C

I'm completely aware that I'm not using NIO, but this is my first polished C project. All criticism is welcome, if I'm doing something wrong, I want to nip it in the bud before I'm used to it. ...
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Thread function for server-client connection

edit: This section has not thrown segmentation faults so lets focus on it please. I am working on multithreading a data server application. I am new to multithreading in general. I wrote a version a ...
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Open server asking for a password

It first creates a server and waits to connect. Once the client connects to the server he gets the line. If he puts the correct code he gets output -> good job. If not -> the software disconnects. My ...
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Raw Text TCP Client v3

After studying and considering the reviews for this code, I began working on the code, and came up with this. It has much better error and disconnect detection, and it also resolves addresses: ...
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Raw Text TCP Client

Yesterday I posted a request for a code review. After reviewing the code and the reviews, and after some sleep, I decided I can do better. In fact I logged on with the intent of deleting the question ...
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Python Socket Receiver

I put this together and am having some doubts to the number of connections I can make. I also doubt if I can brute force the server to serve up connections and then hang. Please take a look and tell ...
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Fetching filesystem directory listings on a server

I developed a server which takes a directory name then lists files in it and sends this list to a client. And I want that server to work with Telnet. It works but I have some questions on how I can ...
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Unit testing Socket communication with a race condition

I've developed a library that wraps TcpClient TcplListener objects into the concept of ...
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407 views

Java NIO Server Scaling

I wrote a Java NIO Echo Server and want to maximize the number of connections to the server. The problem is that when I try to connect more than 10k clients the clients get their connections refused: ...
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227 views

High-volume object-passing from client to server

I have 1 client and 1 server. Client passes Java objects (throughput 10000/sec). I am using Netty. I am short on CPU and this code consumes a lot. I have to make Server1 (Netty Client) talk to ...
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TCP socket retry mechanism

I am writing a C++ client application which will send some data to server and wait for its response. Now the protocol is to wait for a specific timeout and then retry for specific times. If all goes ...
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504 views

Simple C Port Scanner

I have been writing a Simple Port scanner in C, once I got it to work I decided I wanted to make it faster because it takes a very long time for it to get done with scanning all of the ports.Is there ...
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Efficient Ring Buffer (FIFO)

I need to implement a Ring Buffer/FIFO for data coming from a TCP socket. It must support the following operations: Append a the recv()'ed chunk of bytes. Allow me to peek at the beginning of the ...
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AsyncTcpClient (Asynchronous TcpClient)

I've been doing network programming using C#'s TcpClient for several years. The code below is an asynchronous wrapper for ...
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Network Send and Reply

I have developed a TCP listener to receive messages from a client machine, take that string and put it in a db, then send back a response with some data relating to that string. First attempt at a tcp ...
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Custom TcpListener

I have only been coding C# for a short time and I can't say I'm an expert but I am rather enjoying it. I wondered if you could see any way I could improve my code. ...
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TCP Server using NIO to save data from IoT clients

I've built a small single threaded TCP server using NIO. This server is used by small client devices to report things like temperature, when the device has been switched on, when it switches off, and ...
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TCP chat application with both server and client logic in same application

Here is my simple chat program. I'm wondering whether it has an acceptable design (both object oriented design and network design). If you want to run it, I can provide the solution folder. ...
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TCP Client-Server communications

I have developed this simple TCP Server/Client communication program, and am looking for ways of lowering the code footprint where possible.Side note, Both Classes are Main as they run independently, ...
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Creating a TCP Listener and receiving data

I am very new to network programming and I'm thinking I have probably misconstrued the creation of an appropriate TCP listener. The code I have below works perfectly, but I have a feeling it's a "hack ...
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TCP Chat (Server/Client)

I'm looking for some hints or advice regarding efficiency, performance and some good coding practices. Also I'm curious about synchronization. The server is multithreaded, so I think some operations ...
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377 views

Basic TCP server client application

I've written a basic server/client application to use in an automation application written in C#. The code is working pretty good, but I have a few thing I want to improve: Server: ...
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Custom TCP Java proxy socket load balancer

I'm working on implementing a custom TCP proxy server which acts like a load balancer. The proxy server will accept client requests and then forward them to available hosts. I am concerned about the ...
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TCP Server with multithreading

I am working on a banking application. I want to create a multithreaded TCP Payment Card (iso8583) server that can handle passbook printing requests simultaneously. Multiple devices are connected to ...
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730 views

TCP communication with step motor

I have a class that I use to communicate with some hardware equipment (a step motor to be precise): ...
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2k views

Simple TCP Client Server application with receive side only

I wrote simple TCP Client Server application, I was wonder could you please review my code. I would be grateful for any hints and tips regarding to logic of app, coding style or naming convention. ...