Fix TCP/IP udp support.

Change-Id: I819c54e13b5198d11b9e526e8eb2ca8bccc069f8
diff --git a/mbtk/mbtk_lib/inc/mbtk_sock_internal.h b/mbtk/mbtk_lib/inc/mbtk_sock_internal.h
old mode 100644
new mode 100755
index 9e2ec2e..e0cbaa0
--- a/mbtk/mbtk_lib/inc/mbtk_sock_internal.h
+++ b/mbtk/mbtk_lib/inc/mbtk_sock_internal.h
@@ -8,6 +8,7 @@
 
 typedef struct {
     int fd;
+    mbtk_sock_type type; // socket type:TCP or UDP
     entropy_context* entropy;
     ctr_drbg_context* ctr_drbg;
     ssl_context *ssl;