[gprs] Build the SGSN stand-alone and not as part of bsc_hack
Instead of continuing to add more and more functionality to the
bsc_hack binary, we should have the new SGSN code run as a separate
executable.
After this commit we now build a 'osmo_sgsn' executable, using its
own osmo_sgsn.cfg config file.
However, the SGSN is not yet functional, mainly due to the fact that
the BSSGP and GMM code are written with the assumption that there
is a msgb->trx->bts and the according 'sturct gsm_bts' data model
around - which clearly is no longer the case outside of bsc_hack.
diff --git a/openbsc/src/osmo_gbproxy.cfg b/openbsc/src/osmo_gbproxy.cfg
new file mode 100644
index 0000000..f2ef141
--- /dev/null
+++ b/openbsc/src/osmo_gbproxy.cfg
@@ -0,0 +1,13 @@
+!
+! OpenBSC configuration saved from vty
+! !
+!
+line vty
+ no login
+!
+gbproxy
+ nsip bss local port 23000
+ nsip sgsn remote ip 192.168.100.239
+ nsip sgsn remote port 23000
+ nsip sgsn nsei 1
+ nsip sgsn nsvci 11