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Fixed WriteProperty bypass which is only for present-value property of commandable objects. (#984)

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This commit is contained in:
Steve Karg
2025-05-05 21:48:29 -05:00
committed by GitHub
parent 44d727c13b
commit 0f3cbe3ec5
7 changed files with 123 additions and 24 deletions
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doc/bacnet-implementation-guidelines.md
+16 -7
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@@ -760,14 +760,23 @@ does not support the Priority\_Array property.
## 8.24: Ignore Priority and NULL for Non-Commandable object writes
If a property is writable but not commandable, the device shall process
a WriteProperty, WriteGroup or WritePropertyMultiple request and ignore
the priority parameter if it is included in the request.
Clause 19.2.1.1 Commandable Properties specifies the list of
commandable object properties (only present-value for some objects),
and this table defines the list of commandable objects.
If the priority-array property for the object is optional
and not implemented for an object instance, then the object
is not commandable. The Channel object is commandable and does
not include a priority-array.
If an attempt is made to relinquish a property that is not commandable
and for which Null is not a supported datatype and no other error conditions
exist, the property shall not be changed, and the write shall be considered
successful [PR 21+].
If any property is writable but the object is not commandable
(does not contain a priority-array or is a Channel object),
the device shall process a WriteProperty, WriteGroup or
WritePropertyMultiple request and ignore the priority parameter
if it is included in the request.
If an attempt is made to relinquish a present-value property but
the object is not commandable, the property shall not be changed,
and the write shall be considered successful [PR 21+].
## 8.25: Server devices are required to support all COV lifetime values up to 8 hours (28800 seconds)
src/bacnet/basic/service/h_wp.c
+6
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@@ -40,6 +40,12 @@
* the property shall not be changed, and the write shall
* be considered successful.
*
* @note There was an interpretation request in April 2025 that clarifies
* that the NULL bypass is only for present-value property of objects that
* optionally support a priority array but don't implement it.
* See 135-2024-19.2.1.1 Commandable Properties for the list of commandable
* properties of specific objects.
*
* @param wp_data [in] The WriteProperty data structure
* @return true if the write shall be considered successful
*/
src/bacnet/proplist.c
+50
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@@ -534,3 +534,53 @@ bool property_list_bacnet_list_member(
return property_list_member(Properties_BACnetLIST, object_property);
}
/**
* @brief Determine if the object property is a commandable member
*
* 19.2.1.1 Commandable Properties
* The prioritization scheme is applied to certain properties of objects.
* The standard commandable properties and objects are as follows.
*
* @param object_type - object-type to be checked
* @param object_property - object-property to be checked
* @return true if the property is a commandable member
*/
bool property_list_commandable_member(
BACNET_OBJECT_TYPE object_type, BACNET_PROPERTY_ID object_property)
{
bool status = false;
switch (object_type) {
case OBJECT_ACCESS_DOOR:
case OBJECT_ANALOG_OUTPUT:
case OBJECT_ANALOG_VALUE:
case OBJECT_BINARY_LIGHTING_OUTPUT:
case OBJECT_BINARY_OUTPUT:
case OBJECT_BINARY_VALUE:
case OBJECT_BITSTRING_VALUE:
case OBJECT_CHANNEL:
case OBJECT_CHARACTERSTRING_VALUE:
case OBJECT_DATE_VALUE:
case OBJECT_DATE_PATTERN_VALUE:
case OBJECT_DATETIME_VALUE:
case OBJECT_DATETIME_PATTERN_VALUE:
case OBJECT_INTEGER_VALUE:
case OBJECT_LARGE_ANALOG_VALUE:
case OBJECT_LIGHTING_OUTPUT:
case OBJECT_MULTI_STATE_OUTPUT:
case OBJECT_MULTI_STATE_VALUE:
case OBJECT_OCTETSTRING_VALUE:
case OBJECT_POSITIVE_INTEGER_VALUE:
case OBJECT_TIME_VALUE:
case OBJECT_TIME_PATTERN_VALUE:
if (object_property == PROP_PRESENT_VALUE) {
status = true;
}
break;
default:
break;
}
return status;
}
src/bacnet/proplist.h
+3
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@@ -62,6 +62,9 @@ const int *property_list_bacnet_list(void);
BACNET_STACK_EXPORT
bool property_list_bacnet_list_member(
BACNET_OBJECT_TYPE object_type, BACNET_PROPERTY_ID object_property);
BACNET_STACK_EXPORT
bool property_list_commandable_member(
BACNET_OBJECT_TYPE object_type, BACNET_PROPERTY_ID object_property);
#ifdef __cplusplus
}
src/bacnet/wp.c
+15 -9
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@@ -500,6 +500,12 @@ bool write_property_unsigned_decode(
* the property shall not be changed, and the write shall
* be considered successful.
*
* @note There was an interpretation request in April 2025 that clarifies
* that the NULL bypass is only for present-value property of objects that
* optionally support a priority array but don't implement it.
* See 135-2024-19.2.1.1 Commandable Properties for the list of commandable
* properties of specific objects.
*
* @param wp_data [in] The WriteProperty data structure
* @param member_of_object [in] Function to check if a property is a member
of an object instance
@@ -520,25 +526,25 @@ bool write_property_relinquish_bypass(
wp_data->application_data, wp_data->application_data_len);
if ((len > 0) && (len == wp_data->application_data_len)) {
/* single NULL */
if (property_list_commandable_member(
wp_data->object_type, wp_data->object_property)) {
if (member_of_object) {
/* check to see if this object property is commandable.
Does the property list contain a priority-array? */
if (member_of_object) {
has_priority_array = member_of_object(
wp_data->object_type, wp_data->object_instance,
PROP_PRIORITY_ARRAY);
}
if (has_priority_array || (wp_data->object_type == OBJECT_CHANNEL)) {
if (wp_data->object_property != PROP_PRESENT_VALUE) {
/* this property is not commandable,
if (has_priority_array ||
(wp_data->object_type == OBJECT_CHANNEL)) {
/* this property is commandable and shall not be bypassed */
} else {
/* this property that is optionally commandable
is not commandable for this object instance,
so it "shall not be changed, and
the write shall be considered successful." */
bypass = true;
}
} else {
/* this object is not commandable, so any property
written with a NULL "shall not be changed, and
the write shall be considered successful." */
bypass = true;
}
}
test/bacnet/property/src/main.c
+20
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@@ -69,6 +69,26 @@ static void testPropList(void)
property_list_member(
property_list.Required.pList, PROP_OBJECT_NAME),
NULL);
/* validate commandable object property list */
if ((i == OBJECT_CHANNEL) ||
(property_list_member(
property_list.Required.pList, PROP_PRESENT_VALUE) &&
(property_list_member(
property_list.Required.pList, PROP_PRIORITY_ARRAY) ||
property_list_member(
property_list.Optional.pList, PROP_PRIORITY_ARRAY)))) {
zassert_true(
property_list_commandable_member(
(BACNET_OBJECT_TYPE)i, PROP_PRESENT_VALUE),
"Object %s present-value is not listed as commandable",
bactext_object_type_name((BACNET_OBJECT_TYPE)i));
} else {
zassert_false(
property_list_commandable_member(
(BACNET_OBJECT_TYPE)i, PROP_PRESENT_VALUE),
"Object %s present-value is listed as commandable",
bactext_object_type_name((BACNET_OBJECT_TYPE)i));
}
}
/* property is a BACnetARRAY */
for (i = 0; i < OBJECT_PROPRIETARY_MIN; i++) {
test/bacnet/wp/src/main.c
+7 -2
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@@ -308,7 +308,7 @@ static void testWritePropertyNull(void)
bypass = write_property_relinquish_bypass(NULL, NULL);
zassert_equal(bypass, false, NULL);
wp_data.object_type = OBJECT_ANALOG_OUTPUT;
wp_data.object_type = OBJECT_ANALOG_VALUE;
wp_data.object_instance = 0;
wp_data.object_property = PROP_PRESENT_VALUE;
wp_data.application_data_len =
@@ -321,11 +321,16 @@ static void testWritePropertyNull(void)
bypass = write_property_relinquish_bypass(
&wp_data, test_write_property_member_of_object);
zassert_equal(bypass, true, NULL);
wp_data.object_type = OBJECT_CHANNEL;
Is_Property_Member = false;
bypass = write_property_relinquish_bypass(
&wp_data, test_write_property_member_of_object);
zassert_equal(bypass, false, NULL);
wp_data.object_property = PROP_OUT_OF_SERVICE;
Is_Property_Member = true;
bypass = write_property_relinquish_bypass(
&wp_data, test_write_property_member_of_object);
zassert_equal(bypass, true, NULL);
zassert_equal(bypass, false, NULL);
}
#if defined(CONFIG_ZTEST_NEW_API)