diff -r 92f02bb17c7e -r 6dddf3070806 bacnet/runtime/mso.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/bacnet/runtime/mso.h	Fri Jun 08 13:28:00 2018 +0200
@@ -0,0 +1,110 @@
+/**************************************************************************
+*
+* Copyright (C) 2012 Steve Karg <skarg@users.sourceforge.net>
+* Copyright (C) 2017 Mario de Sousa <msousa@fe.up.pt>
+*
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*
+*********************************************************************/
+#ifndef MULTISTATE_OUTPUT_H
+#define MULTISTATE_OUTPUT_H
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "bacdef.h"
+#include "bacerror.h"
+#include "rp.h"
+#include "wp.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+
+/* MultiState Outputs are encoded in unsigned integer
+ * (in BACnet => uint8_t), and can not be 0.
+ * See ASHRAE 135-2016, section 12.20.4
+ */
+#define MULTISTATE_MAX_NUMBER_OF_STATES (255)
+
+
+    typedef struct Multistate_Output_descr {
+        /* pointer to IEC 61131-3 located variable that is mapped onto this BACnet object */
+        uint8_t *Located_Var_ptr;
+        uint32_t Object_Identifier;  /* called object 'Instance' in the source code! */
+        char    *Object_Name;   
+        char    *Description;
+        uint8_t  Number_Of_States;
+
+        /* stores the current value */
+        /* one entry per priority value */
+        uint8_t Present_Value[BACNET_MAX_PRIORITY];
+        /* Writable out-of-service allows others to manipulate our Present Value */
+        bool Out_Of_Service;
+        char State_Text[MULTISTATE_MAX_NUMBER_OF_STATES][64];
+    } MULTISTATE_OUTPUT_DESCR;
+
+
+    void Multistate_Output_Property_Lists(
+        const int **pRequired,
+        const int **pOptional,
+        const int **pProprietary);
+
+    bool Multistate_Output_Valid_Instance(
+        uint32_t object_instance);
+    unsigned Multistate_Output_Count(
+        void);
+    uint32_t Multistate_Output_Index_To_Instance(
+        unsigned index);
+    unsigned Multistate_Output_Instance_To_Index(
+        uint32_t instance);
+
+    int Multistate_Output_Read_Property(
+        BACNET_READ_PROPERTY_DATA * rpdata);
+
+    bool Multistate_Output_Write_Property(
+        BACNET_WRITE_PROPERTY_DATA * wp_data);
+
+    /* optional API */
+    bool Multistate_Output_Object_Name(
+        uint32_t object_instance,
+        BACNET_CHARACTER_STRING * object_name);
+
+    uint32_t Multistate_Output_Present_Value(
+        uint32_t object_instance);
+    bool Multistate_Output_Present_Value_Set(
+        uint32_t object_instance,
+        uint32_t value,
+        uint8_t  priority);
+
+    bool Multistate_Output_Out_Of_Service(
+        uint32_t object_instance);
+    void Multistate_Output_Out_Of_Service_Set(
+        uint32_t object_instance,
+        bool value);
+
+    void Multistate_Output_Init(
+        void);
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif