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C# Upgrade + Bugs Fixes of an UDP Chat Server + Client

I am making a Chat Server + Client by using UDP Protocol

This chat server is work like Game World Chat, when one player chat, all players in that game can see the chat. So basically, when one client send chat, then all clients that all connected can see that chat too. Well for some reason, i'm gonna need your help to upgrade and bugs fixes.

Information:

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Script: C# + .NET

Engine: Microsoft Visual Studio 2015

Framework: .NET Framework 4.6

OS: Windows 7 or above

Your Job:

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1. Bug fix especially when there is two or more clients connected to server, then one of the client close ungracefully, it cause error on server and closing the server application, how to fix this?

2. How to detect if the clients has no longer connected to the server on UDP Socket? Because so far i know, UDP is connectionless protocol, so it is almost impossible to detect which one client has been disconnected yet.

3. Please do upgrade my script to become more secure connection, so no one can't hijack / hack / crack it easily

4. Please do upgrade my script to become light / faster / smooth, because my hope this server capable to handle over 10.000 clients realtime running 24/7 Non-Stop

5. Your suggestion ...

--> Well, i'm not perfect, so i want to hear any suggestion from you to upgrade my server, if you have an idea to improve my server besides the other 4 points above, i would like to hear it from you, and we are gonna talk some more about extra charge.

The server and client is console based, so you don't need to give any UI/GUI on it. Just use simple command console like "/connect" "/shutdown" etc...

BEWARE:

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Because i'm on a tight schedule, i'm must force you to finish this project between 3-5 days

You can get the file of my server publicly at this project attachment... Please download and learn it before you put a bid on my project.

Квалификация: .NET, Программирование на C#, Архитектура ПО, Разработка ПО, Тестирование ПО

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О работодателе:
( 9 отзыв(-а, -ов) ) Bandung, Indonesia

ID проекта: #8984251

6 фрилансеров(-а) в среднем готовы выполнить эту работу за $476

zuiguanglong

A proposal has not yet been provided

$210 USD за 1 день
(42 отзывов(-а))
6.0
kazakovdmitry

A proposal has not yet been provided

$500 USD за 10 дней(-я)
(24 отзывов(-а))
5.7
logicpowered

We are very interested in this project. I have read your above description and i think its well within our range to execute this is in a good time frame so would you be kind enough to message me so we can have a fast a Больше

$1000 USD за 5 дней(-я)
(14 отзывов(-а))
6.2
ducnguyenvn

I have 4+ years expertise developing software by .NET and SQL SERVER. I can help you finish this project with the best quality.

$200 USD за 5 дней(-я)
(25 отзывов(-а))
5.0
snmpproject

Ainda não foi fornecida uma proposta

$444 USD за 3 дней(-я)
(0 отзывов(-а))
0.0
algofactory

Hi, Here are a couple of suggestions: 1. To fix the bug for server application crashing: In the ServerProject\[login to view URL], in the ReceiveCallback method, try making the addition of the clientEP to the Clients and C Больше

$500 USD за 15 дней(-я)
(2 отзывов(-а))
1.0