struct.error for variable (Int16)

[nict17]

Hello,
if i import a nodeset with a ParameterSet that contains a variable of datatype Int16 and then start the server, the following struct_error appears when performing a browse-request for this variable.

Traceback (most recent call last):
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\server\uaprocessor.py", line 126, in process_message
    return await self._process_message(typeid, requesthdr, seqhdr, body)
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\server\uaprocessor.py", line 240, in _process_message
    self.send_response(requesthdr.RequestHandle, seqhdr, response)
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\server\uaprocessor.py", line 46, in send_response
    struct_to_binary(response), message_type=msgtype, request_id=seqhdr.RequestId)
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 301, in struct_to_binary
    return serializer(obj)
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 290, in serialize
    return b''.join(
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 292, in <genexpr>
    else serializer(obj.__dict__[name])
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 347, in serialize
    return data_size + b''.join(type_serializer(el) for el in val)
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 347, in <genexpr>
    return data_size + b''.join(type_serializer(el) for el in val)
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 290, in serialize
    return b''.join(
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 292, in <genexpr>
    else serializer(obj.__dict__[name])
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 347, in serialize
    return data_size + b''.join(type_serializer(el) for el in val)
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 347, in <genexpr>
    return data_size + b''.join(type_serializer(el) for el in val)
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 290, in serialize
    return b''.join(
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 292, in <genexpr>
    else serializer(obj.__dict__[name])
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 301, in struct_to_binary
    return serializer(obj)
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 290, in serialize
    return b''.join(
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 292, in <genexpr>
    else serializer(obj.__dict__[name])
  File "c:\Users\Documents\dummy-servers\.env\lib\site-packages\asyncua\ua\ua_binary.py", line 125, in pack
    return struct.pack(self.format, data)
struct.error: ushort format requires 0 <= number <= 0xffff

My Idea was that it could has smth. to do with the lenght of the Integer but im not quit sure.
Im also not sure if the problem exists on module-site or if my nodeset is incorrect.

Used asyncua version: 0.9.92

Thanks for your support!
Best regards
Nico

[swamper123]

struct.error: ushort format requires 0 <= number <= 0xffff

The error says, it's a wrong type. ushort is a uint16, not an int16. Have you checked that?
What value does this Node contain at server start?
How does the nodeset for that Node looks like?

[nict17]

So, now ive made sure that the variable is a Uint16, but the problem was not fixed then.
Instead having a look into the xml leads me to the answer. there were unreferred nodes in the e-tree that were causing the error. Im still not quiet sure why exactly, but it works now.

    <UAVariable DataType="String" NodeId="ns=5;i=6008" BrowseName="-1:TargetDescription" ParentNodeId="ns=5;i=5003" UserAccessLevel="3" AccessLevel="3">
        <DisplayName>TargetDescription</DisplayName>
        <References>
            <Reference ReferenceType="HasTypeDefinition">i=63</Reference>
        </References>
    </UAVariable>

Thanks for your support!