On 10/18/2017 04:49 AM, Pičugins Arsenijs wrote:
I'm interested in running ofono on a Raspberry Pi (BCM2835, 1GHz), connected to a
SIM800 modem over UART (the stable Pi UART, not the MiniUART). I also have RST, DTR and
RESET signals connected to the Pi, and for sound I'm using analog audio outputs and
inputs of the modem. Basically, I'm talking about using ofono in ZeroPhone project -
For now, I'm interested in 1) notifications about voice call status (not concerning
audio for now, as it's handled in hardware) 2) SMS and MMS support 3) 2G data
connections (whatever available connection types are on 2G networks) 4) USSD support. My
1) Is ofono going to be suitable for my needs? I'm more than OK with using DBus and
rolling my own user interface to it.
It supports everything except MMS. That requires a separate MMS stack
and is out of scope for oFono. I don't know of any full-featured open
source MMS stacks, but I'm probably not paying enough attention. Maybe
someone here can give you pointers.
You can take a look at the (now undeveloped) mmsd project to see how the
MMS stack should interact with oFono:
2) How do I run ofono from command-line and tell it to connect to a
specific serial port and use a specific ofono driver?
You write a driver for it and since it is a serial port modem, use udev
rules to setup the TTY port accordingly. See doc/sim900-modem.txt for
an example. The device detection magic is inside plugins/udevng.c and
most modem drivers reside in plugins/*. See the plugins/sim900.c, it
may be close enough to the sim800 to get you started.
3) Do you foresee any necessary changes to ofono? For example, need
to make a sim800-specific driver?
The most likely answer is yes. All new modems integrated into oFono
required 'some' vendor/firmware specific handling. However, it is not
possible to answer that unless you have the modem control protocol
specifications in hand. If it is a standard AT command based modem,
then the changes should be minimal.
4) I see that Sailfish phones are using ofono as the GSM backend. Did
they upstream their changes, or do they have a fork?
They have a fork.
5) I'm planning to work with SIM5320 modem in the future, and
attempt using its USB connection. I know it creates multiple serial ports, and supports
streaming audio over one of them. Does ofono come into play here, does it have some kind
of provisions to convert this kind of audio input/output into actual sound devices under
Linux, or is that usually handled by other software?
oFono does not handle the audio bits. We can take care of sending the
necessary AT commands to the device to configure the codec, etc. But
the actual audio processing belongs in your audio daemon. E.g.
PulseAudio or whatever.