23 Oct
2013
23 Oct
'13
7:44 p.m.
Hi,
I am trying to modify osmocomBB to work without the phone as layer 1.
My goal is that application will using socket to communicate with BTS
(modified BTS which can send and receive message throught sockets).
I analyzed the osmocomBB code and I found that I'll have to modify
osmocon.c (host/osmocon/osmocon.c) file. This file is interface between
serial communication and layer2. If I am right, I have to do this changes:
1. Delete functions handle the serial interface
2. Add new tool server to dnload structure
3. Creating new tool server for L1 interface (UNIX socket or IP socket
with GSMTAP)
4. Add callback function for reading from layer2 socket and forward
this messages to L1 socket interface.
Simplified I have to listen and forward packets from BTS to layer2
socket and from L2 to L1.
Do I think in right direction or I am wrong and it will need more
modifications?
Best regards,
Miroslav Babjak
23 Oct
23 Oct
8:44 p.m.
Hi,
Do I think in right direction or I am wrong and it
will need more
modifications?
You should just implement a virtual layer 1 that uses the same
interface as osmocon and present it to the 'mobile' application. No
need to modify anything.
osmocon is full of stuff you won't need, it's much easier to start
from scratch and implement something new that implements the L1CTL
protocol that goes over serial.
Cheers,
Sylvain
24 Oct
24 Oct
8:14 p.m.
Hi,
thanks for quick answer and advice.
I looked for l1ctl in sources files and I found it in
src/host/layer23/src/common. I quickly looked at the main.c file in this
directory and it looks quite simple if I use the l1l2_interface and
l1ctl. We'll see how it goes.
The L1 interface is only one part from what I want to do.
The second part will be harder. I want to implement a GPRS stack to the
'mobile' application. I know that osmocomBB hasn't GPRS support and I
have to build it from scratch. I found some topics about it in mailing
list. It says that i can use the GPRS parts from another projects. SNDCP
from OsmoSGSN and RLC/MAC message encoding and parsing from osmo-pcu. Is
that true? Can you give me some hints to start?
Best regards,
Miroslav Babják
Dne 23.10.2013 22:44, Sylvain Munaut napsal(a):
Hi,
Do I think in right direction or I am wrong and
it will need more
modifications?
You should just implement a virtual layer 1 that uses the same
interface as osmocon and present it to the 'mobile' application. No
need to modify anything.
osmocon is full of stuff you won't need, it's much easier to start
from scratch and implement something new that implements the L1CTL
protocol that goes over serial.
Cheers,
Sylvain
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days inactive
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Sylvain Munaut