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mikakaraila / node-red-contrib-opcua

A Node-RED node to communicate OPC UA. Uses node-opcua library.
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[red] Uncaught Exception - (Cannot convert undefined or null to object) when Write with OPC Item of type ExtensionObject #671

Closed BenoitFocant closed 4 months ago

BenoitFocant commented 4 months ago

Hello,

I try to write à ExtensionObject from a MQTT topic to an OPC UA variable.

When I READ the variable using the same OPC Item there s no problem. But if I try to WRITE, there is an exception and node-red crash.

The Node-Red Log:

29 Feb 09:12:13 - [warn] [OpcUa-Client:344b29e6a347be4d] Create session with userIdentity node.client false userIdentity {"type":0} 29 Feb 09:12:24 - [red] Uncaught Exception: 29 Feb 09:12:24 - [error] TypeError: Cannot convert undefined or null to object at Function.assign () at build_new_extensionObject_dataValue (/data/node_modules/node-red-contrib-opcua/opcua/102-opcuaclient.js:1768:40) at write_action_input (/data/node_modules/node-red-contrib-opcua/opcua/102-opcuaclient.js:1738:17) at OpcUaClientNode.processInputMsg [as _inputCallback] (/data/node_modules/node-red-contrib-opcua/opcua/102-opcuaclient.js:829:11) at /usr/src/node-red/node_modules/@node-red/runtime/lib/nodes/Node.js:214:26 at Object.trigger (/usr/src/node-red/node_modules/@node-red/util/lib/hooks.js:166:13) at OpcUaClientNode.Node._emitInput (/usr/src/node-red/node_modules/@node-red/runtime/lib/nodes/Node.js:206:11) at OpcUaClientNode.Node.emit (/usr/src/node-red/node_modules/@node-red/runtime/lib/nodes/Node.js:190:25) at OpcUaClientNode.Node.receive (/usr/src/node-red/node_modules/@node-red/runtime/lib/nodes/Node.js:499:10) at deliverMessageToDestination (/usr/src/node-red/node_modules/@node-red/runtime/lib/flows/Flow.js:800:40)

NODE_RED_VERSION=v3.1.3 (docker image)

image

My Flow: image

OPC item Config: image

OPC Client Config for write operation: image

The Value in the MQTT topic OPC_TEST/data: { "mandatoryInt32": 0, "mandatoryStringArray": [ "op", "hihaaaaaaaaaaaa" ] }

What I Publish in MQTT to be write in OPC (view of debug 4 and 5 in my flow): image

Thank you for your help :)

mikakaraila commented 4 months ago

Hard to debug and test as I don´t have environment. This has always been problematic with custom types / extension objects...

I will try to look my code, but cannot promise anything.

BenoitFocant commented 4 months ago

Hello,

After investigation in other topics, I finaly found the good way to write ExtensionObject. The topic Can't instantiate Extension Object

605] was the most adapted for me.

Then, I think this topic can be closed :)

Br,