+extern char _GRAS_header[6];
+
+extern int gras_msg_libdata_id; /* The identifier of our libdata */
+
+/** @brief Message instance */
+typedef struct {
+ gras_socket_t expeditor;
+ gras_msgtype_t type;
+ void *payload;
+ int payload_size;
+} s_gras_msg_t, *gras_msg_t;
+