From: Brian Candler <lists@...>
Date: 2012-07-01T06:52:15+09:00
Subject: Re: Newb on String to Hex for UDP packet

ricky quirch wrote in post #1066641:
> eg: Please enter last octect of IP address: user enters:123 or 7B
>
> i then want to include that as a hex byte in a UDP packet and send it.
>
> Eg: UDP = "/x00/x12/x23/(insert value in hex here)/x00/x00"
>
> I managed to include the value in there but the resulting UDP packet is
> sending the value in asccii,
> the packet looks like: 00:12:23:31:32:33:00:00

You might want to look at Array#pack

>> [123].pack("C")
=> "{"
>> [255].pack("C")
=> "\377"
>> [192,168,1,4].pack("C*")
=> "\300\250\001\004"
>> [0x7f000001].pack("N")
=> "\177\000\000\001"

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