Re: [simspark-devel] Physical and Graphic Layers, and agent-server Binary Protocol

[Hedayat V. <hed...@ai...>]

/*Oliver Obst <oli...@cs...>*/ wrote on ۰۹/۰۲/۰۹ 12:27:29:
> On 09/02/2009, at 6:57 AM, Mahdi wrote:
>
>   
>>   For the problem you mentioned about the binary size mismatch of  
>> indormation in different cpu architectures, I did a bit of  
>> searching, and found out that Microsoft dot net framework has  
>> introduced some types like int32, int64 and like these, which gcc  
>> yet does not support, or may not support at all. (Please correct me  
>> if I am assuming wrong) So another way should be found around the  
>> problem. Anybody got any idea?
>>     
>
> I don't think that introducing a binary protocol is a good idea, and  
> should be avoided if possible.
> For the sensors we're using at the moment, a text based protocol is a  
> good solution because it's human readable. A float always uses up 4  
> bytes, and the text representation doesn't use much more (in some  
> cases, it can use less). Plus you may introduce cross-platform issues  
> that should be avoided. The work to implement and the hassle of using  
> a binary protocol isn't worth the relatively small gain in efficiency.
>
> There are two cases where it may be necessary: For camera data and  
> player integration. So I'd like to suggest to think about a mixed  
> protocol instead of pure binary. S-Expressions (the syntax for the  
> protocol we're using now) support binary data, or another solution  
> would be a binary protocol combined with the S-Exp for the existing  
> sensors / actuators.
>   
If we implement Player integration, the binary protocol is handled by 
Player (and it do it in a portable manner using XDR). It is possible to 
send S-expressions using Player, but then the main purpose of 
integrating with Player is lost sine we are still using our custom protocol.



> just my AU$0.02
>
> cheers
> Oliver
>   


Thanks a lot,
Hedayat
>
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