MMS retrieval

[Dan Williams]

On Wed, 2019-06-12 at 10:34 -0700, Christopher McKenzie wrote:
> Hello,
> 
> I've checked the mailing list and I can't find any history on this.
> I'm 
> wondering if anyone has successfully received the content of MMS
> messages.
> 
> On my T-Mobile SIM I get a message that translates to 
> (binascii.unhexlify of the mmcli -m -s * content) 
> "application/vnd.wap.mms-message" with a URL link at the end of the 
> payload.  When I curl -I the url I get the following:
> 
> 299 GBA "Generic Bootstrapping Architecture (3GPP TS 33.220) support
> is 
> required to access the requested resource"
> 
> After doing some research it looks like the server wants to have a 
> sophisticated conversation with me (see the spec here, warning
> zipped 
> msword: 
> https://portal.3gpp.org/desktopmodules/Specifications/SpecificationDetails.aspx?specificationId=2280). 
> 
> I've seen evidence that Maemo knows how to talk this language and
> after 
> searching the source code I believe that gammu does not.
> 
> I've found a few implementations that will decode the 
> vnd.wap.mms-message payload, but no standalone that will then proceed
> to 
> talk with the remote server and get the content.
> 
> Has anyone found any open source tools that can ingest these 
> application/vnd.wap.mms-message payloads and get the corresponding
> MMS 
> content?

IIRC it's just HTTP to the MMSC over the MMS PDP/EPS context if your
provider uses a non-default context for MMS. Otherwise it can just go
to the MMSC over the default context.

Which is why ModemManager doesn't do anything MMS-related because MMS
is all at the IP level so once MM has set up connectivity then anything
can do MMS.

For example, fMMS:

https://github.com/frals/fmms/blob/315e24068ef23e87f68838ff96e6ec91f7849959/wappushhandler.py#L225

But I don't actually know much more than that. But I think fMMS is
basically what you want, albeit in Python and coded to Maemo UI and
system services.

MM might still be involved if it doesn't correctly deliver/interpret
the SMS Push messages that say you have a new MMS to receive, but I
think it already does that. I haven't checked though.

Dan

> Or, alternatively, is there another way to retrieve the (mostly)
> images  
> from an MMS message that doesn't use this approach? Thanks.
> 
> ~chris.
> 
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