[Feature]Upload Modem source code

Change-Id: Id4294f30faced84d3e6fd6d5e61e1111bf287a37
diff --git a/mcu/interface/service/sst/swtr_public.h b/mcu/interface/service/sst/swtr_public.h
new file mode 100644
index 0000000..5f8df0a
--- /dev/null
+++ b/mcu/interface/service/sst/swtr_public.h
@@ -0,0 +1,4 @@
+#ifndef SWTR_PUBLIC_H
+#define SWTR_PUBLIC_H
+
+#endif