Re: [Discuss-gnuradio] bbn_80211b_rx.py: how is the received packet handled please?

[yyzhuang]

That's the point. But to unpack a packet, we have to know exactly its format.
Hope someone can tell what format of the packet is. And what information can
we get from the packets.

Thanks everybody =^D


Mason-29 wrote:
> 
> Quoting "Y. Zhuang" <address@hidden>:
> 
>> Thanks very much for help. So "@qHBB" and "@qHbB" actually mean the
>> format that we should unpack this string, right? What is the
>> differences between "@qHBB" and "@qHbB" then? and "@BBBBBB"?
>>
>> Thank you
>>
> 
>      Yes. Basically, to summarize the python doc I linked, if you have  
> binary data stored in a string you want to decode, each character in  
> the python format string corresponds to one or more of the bytes in it  
> (with the exception of the @ at the beginning. @ tells the byte order  
> and alignment to use -- the system default in this case). Then q would  
> be a long long, H an unsigned short, and B being an unsigned char.  
> Also, @BBBBBB can be written as @6B, and you can construct the  
> formatting strings dynamically if needed (if transmitting a variable  
> length packet).
> 
>      The difference between qHbB and qHBB is that the lowercase b in  
> the middle is signed and the capital B is unsigned. (i.e. is the  
> number stored in two's-complement.) Of course, what that means for the  
> code is up to the coder.
> 
> --Mason
> 
> 
> 
> 
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