Priority Array read throwing ERROR CODE UNKNOWN PROPERTY about bacnet HOT 8 OPEN

Hi @mwitt1337, would you be able to provide me wireshark dump with the request and response (only those packets needed) which is triggering the error? This would be the easiest way to fix it. Thanks!

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I'm trying to figure out what's going on here because there is a growing list of Property Ids that are returning Unknown Property.

I've attached a screenshot from BDT 2.12.01 Bacnet Explorer that returns values for these properties from the same devices that are returning Unknown Property using this API.

Of course the first instinct is to think that the device address is incorrect but shown in my screenshot in the initial post the property name and current value is returning without issue.

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Here is my list of tested properties

FAILED: UNKNOWN PROPERTY
PROP_SYSTEM_STATUS
PROP_VENDOR_NAME
PROP_VENDOR_IDENTIFIER
PROP_MODEL_NAME
FIRMWARE_REVISION
PROP_APPLICATION_SOFTWARE_VERSION
PROP_PROTOCOL_SERVICES_SUPPORTED
PROP_PROTOCOL_OBJECT_TYPES_SUPPORTED
PROP_LOCAL_DATE
PROP_LOCAL_TIME
PROP_MAX_MASTER
PROP_PRIORITY_ARRAY
PROP_PRIORITY

RETURNED VALUES
PROP_OBJECT_NAME
PROP_PRESENT_VALUE
PROP_STATUS_FLAGS = 0000

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Hi @mwitt1337, would you be able to provide me wireshark dump with the request and response (only those packets needed) which is triggering the error? This would be the easiest way to fix it. Thanks!

Working on getting the Wireshark data

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Dumped from code loop in this thread trying to read priority array.

dump.zip

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Thanks @mwitt1337 I will look into this.

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Update from more testing

I tested the property PROP_VENDOR_NAME and it returns a value for the device that responds to the WhoIs.
For clarity here are the steps:

1. Device responds to WhoIs. We will call this ParentDevice
2. Successfully read the PROP_OBJECT_LIST from the ParentDevice
3. Loop through the PROP_OBJECT_LIST. We will call each of these ChildDevice
4. Call ReadPropertyRequest for each ChildDevice using PROP_OBJECT_NAME and it returns a value
5. Call ReadPropertyRequest for each ChildDevice using PROP_PRESENT_VALUE and it returns a value
6. Call ReadPropertyRequest for each ChildDevice using PROP_VENDOR_NAME and it throws Exception UNKNOWN_PROPERTY

The "ParentDevice" returns values for PROP_VENDOR_NAME but each "ChildDevice" returns UNKNOWN_PROPERTY.
The "ChildDevice" will return values for PROP_OBJECT_NAME and PROP_PRESENT_VALUE

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Any updates?

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