Added WriteGroup service and Channel object interfaces (#829)

src/bacnet/bacapp.h

@@ -28,6 +28,7 @@
 #include "bacnet/weeklyschedule.h"
 #include "bacnet/calendar_entry.h"
 #include "bacnet/special_event.h"
+#include "bacnet/channel_value.h"
 
 #ifndef BACAPP_PRINT_ENABLED
 #if PRINT_ENABLED
@@ -163,6 +164,9 @@ typedef struct BACnet_Application_Data_Value {
 #endif
 #if defined(BACAPP_ACCESS_RULE)
         BACNET_ACCESS_RULE Access_Rule;
+#endif
+#if defined(BACAPP_CHANNEL_VALUE)
+        BACNET_CHANNEL_VALUE Channel_Value;
 #endif
     } type;
     /* simple linked list if needed */
@@ -354,6 +358,10 @@ int bacapp_snprintf_value(
     size_t str_len,
     const BACNET_OBJECT_PROPERTY_VALUE *object_value);
 
+BACNET_STACK_EXPORT
+bool bacapp_channel_value_copy(
+    BACNET_CHANNEL_VALUE *cvalue, const BACNET_APPLICATION_DATA_VALUE *value);
+
 BACNET_STACK_EXPORT
 bool bacapp_parse_application_data(
     BACNET_APPLICATION_TAG tag_number,