Re: Running ofono on Raspberry Pi and SIM800

[Denis Kenzior <denkenz@gmail.com>]

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Hi Arsenijs,

Just FYI, we don't top-post on this mailing list.

On 10/18/2017 11:40 AM, Pičugins Arsenijs wrote:
> Thank you, that was a great answer. I'll focus on one part for now:
> 
> Is it possible for me to run ofono from command-line, without involving udev? I'm asking this because, in my application, I'm using the UART as a debugging UART for first 30 seconds of phone's boot, then, if there's no activity (or other trigger set), I enable the GSM modem and run the GSM backend. Is there a reason why ofono is not capable to be run this way (provided it's not capable of this)? Is there a way I can just do the setup that udev would normally do, but manually? If so, where should I look for pointers - code, documentation or somewhere else? (doc/sim900-modem.txt? plugins/udevng.c?)

oFono can be started any time you wish.  udev is just normally used to 
detect the hardware.  Either via probing the USB bus, or in the case of 
serial devices via external configuration (e.g. udev rules).  Without 
udev oFono would not know what TTY corresponds to the modem.  E.g. on 
some platforms it may be ttyS0 and others it would be /dev/ttySAC0, or 
whatever.

The oFono plugins / modem drivers are free to do anything they want.  So 
if you want to hardcode the behavior, that is fine.  You can always 
implement your own detection logic.  For example plugins/phonesim.c uses 
a config file, plugins/rildev.c uses getenv.  The possibilities are endless.

udev is the preferred approach, other approaches might not be palatable 
to upstream.

In terms of documentation or pointers, it really depends on your 
hardware setup.  If you have a traditional AT command based modem with a 
multiplexer, then take a look at doc/calypso-modem.txt and 
plugins/calypso.c.  This is the modem used on the original Freerunner.

If you have multiplexing handled by the kernel, then the SIM900 docs / 
plugin might be applicable.

> 
> Best regards,
> Arsenijs.
> 

Regards,
-Denis