Add WIP code for SCCP User Adaptation (SUA) and SCCP User SAP
The idea of this code is to
* provide a SCCP User SAP as boundary between the User of SCCP
or SCCP-like transport like SUA
* implement the minimum subset of SUA to transport RANAP messages
betweene HNB-GW and MSC/SGSN
At this point
* we don't yet implement the proper state machines and timer
* we don't imp[lement the SCCP RESET procedure
* we don't implement AS/ASP management
The code is full of FIXMEs whihc hopefully will get fixed gradually.
After some cleanup + verification, it should move to a library, possibly
either replacing/renaming libomo-sccp, or adding it to libosmo-netif?
diff --git a/sigtran/sua.h b/sigtran/sua.h
new file mode 100644
index 0000000..add2fd8
--- /dev/null
+++ b/sigtran/sua.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include <stdint.h>
+#include <osmocom/core/prim.h>
+
+struct osmo_sua_user;
+
+void osmo_sua_set_log_area(int area);
+
+struct osmo_sua_user *osmo_sua_user_create(void *ctx, osmo_prim_cb prim_cb);
+void osmo_sua_user_destroy(struct osmo_sua_user *user);
+
+int sua_server_listen(struct osmo_sua_user *user, const char *hostname, uint16_t port);
+
+int sua_client_connect(struct osmo_sua_user *user, const char *hostname, uint16_t port);
+struct sua_link *sua_client_get_link(struct osmo_sua_user *user);
+
+/* user hands us a SCCP-USER SAP primitive down into the stack */
+int osmo_osmo_sua_user_link_down(struct sua_link *link, struct osmo_prim_hdr *oph);
+