[mmsd] Error handling while receiving message

[Ronald Tessier <ronald.tessier@linux.intel.com>]

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Hi,

I'm working on handling errors while receiving an MMS (listed in TODO as 
: "Error cases should handled and reported to the application layer." in 
MMS Reception section).

What kind of error do you want to report to the application : generic 
MMS reception error such as "Unable to decode message", "Unable to 
download message" ... or more accurate error (error code, "HTTP error 
XXX", "Communication error while downloading message"... ) ?

Since the reception is automatically performed, there is no D-Bus reply 
msg to use to send error back to the application !
I cannot always handle the error in 'Message' interface since the D-Bus 
object (associated to the message) does not exist before having 
downloaded the entire message. More generally, how to handle errors that 
occurs before the message D-Bus object has been published ?
Should I define a new signal ("MessageError") in 'Service' interface to 
report errors ?

What kind of information the reported error should contain ? the sender 
(if the notification has been decoded), the meta file path (if 
available) ... ?

Thanks in advance,
Regards,

Ronald