Improper Handling for Messages That Do Not Specify Source/Address Port

[Sicelo <absicsz@gmail.com>]

Hi

While running ofono in debug mode, I discovered that there are certain
types of sms-like messages that arrive in ofono core, but are discarded
without being sent to the client. For these, the ofono log shows a lot
of:

  ofonod[3424627]: Got an 8-bit encoded message, however no valid src/address port, ignore

These messages are valid, and ofono should not discard them. In my case,
for example, the messages come in while connected to mobile data. They
are sent by the carrier periodically to notify me about the credit that
has been deducted from my prepaid plan.

At first, I thought the issue was on the isimodem driver, but I later
found the same log on my laptop, whose modem uses plugin/ericsson-mbm.

I am currently working on other issues that I have with ofono on my
platform (isimodem), otherwise I would try to work on it.

Hope the report is clear enough. I can provide more information if
needed.

Sincerely
Sicelo