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Asked: 2026-05-13T07:29:56+00:00

I want to write a client program that communicates with the application server via

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I want to write a client program that communicates with the application server via standard TCP/IP. The client can speak to the application server and be authenticated by simply speaking in a specific text based protocol. The traffic will be encrypted, but there won’t be username/password. If another application tries to communicate with the application server and if the application doesn’t use the correct text based protocol, the application server will silently discard packets.

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  1. Editorial Team

    You can use a simplified version of TLV (Tag Length Value).

    The basic idea is to define a set of message types which are represented by a code of fixed size (the T for Tag). Depending the type of message the contents of it (the V for Value) can very so you specify its length (the L for Length) before the contents. The Length field also has fixed size

    Suppose you have one message used to send user data to the server. You can define a message like:

    0x01 0x0018 0x11 0x0003 tom 0x12 0x000F tom@hotmail.com

Tag: 0x10 User data. Length: 0x0018 Value: sub tags

    Tag 0x11: user name Length: 0x0003 Value = tom
    Tag 0x12: email. Length: 0x000F. Value = tom@hotmail.com

    Edited:

    I was about to forget: Merry Christmas 🙂

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