[SIP Beyond VoIP] MSRP File transfer

[Adrian Georgescu]

Paulo,

If you send everything in one big message how can you obtain confirmation for the received bytes and plot a progress bar? What if the transfers fails at 50%, how do you know what happened and at which point?

If you split the chunks in discrete MSRP messages you can request delivery reports for each individual message with its byte range. Is much more reliable than sending a big blog of data and hoping for the best.

Adrian

On Aug 30, 2011, at 8:05 PM, Paulo Fidalgo wrote:

> I've re-writed the method _write_file in MSRPSession class in order to take a file and send the chunks in MSRP send messages, as I wish to do.
> 
> I suspect that I should be doing something wrong with the response timers, because when I run the client (with caller and calle) in the same machine I can get a file transfer of ~70MB to finish, but when     running on diferent machines (either the sip-session or boghe) the transfer is canceled.
> 
> I've uploaded the function here: https://gist.github.com/1181470
> 
> My suspect is cb_and_timer since there is one instance per transaction id, but  outgoing_file.on_transaction_response acts in message_id, wich is the same for all the messages.
> 
> Can anybody give me an hint?
> 
> Thanks for your attention,
> 
> Paulo Fidalgo
> 
> On 29-08-2011 17:15, Adrian Georgescu wrote:
>> 
>> Well, is a software library, nobody stops you to use it differently and send the files in any ways you consider appropriate.
>> 
>> Adrian
>> 
>> On Aug 29, 2011, at 6:11 PM, Paulo Fidalgo wrote:
>> 
>>> Hi!
>>> 
>>> I think there's a misunderstanding here. I want to send data chunks in MSRP SEND Messages, and in SIPSIMPLE it sends the whole file streamed in 64KB pieces.
>>> What I want is to send one MSRP SEND Message for every 64KB of data, instead of send a a SEND message then stream the data.
>>> 
>>> I think both approaches are right according to the RFC, although the one which sends an MSRP message for every chunk introduces more overhead.
>>> 
>>> PS: by data I mean file binary data only, not the MSRP message with headers.
>>> 
>>> Best regards,
>>> 
>>> Paulo Fidalgo
>>> 
>>> On 29-08-2011 17:00, Saúl Ibarra Corretgé wrote:
>>>> Hi,
>>>> 
>>>> On Aug 29, 2011, at 5:52 PM, Paulo Fidalgo wrote:
>>>> 
>>>>> Hi Saúl!
>>>>> 
>>>>> You are right, but this is only true for the first chunk, because in further chunks only data is written (in _write_file method).
>>>>> 
>>>> What do you mean by 'only data' ? A single MSRP message is sent, but the data is streamed in 64KB pieces.
>>>> 
>>>> Regards,
>>>> 
>>>> --
>>>> Saúl Ibarra Corretgé
>>>> AG Projects
>>>> 
>>>> 
>>>> 
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