Unable to Write Float Array using node-red-contrib-iiot-opcua

[lucatralli]

I'm trying to write a "Float Array[5]" to an OPC UA Server using node-red-contrib-iiot-opcua (version 4.1.2). While reading works perfectly, writing the array fails with a BadTypeMismatch error.

Current Situation

Reading (Works)
Reading the array works fine and returns:

{"0":0,"1":110,"2":140,"3":200,"4":250}

Writing (Fails)

Attempted payload:

{
"nodetype": "node",
"injectType": "write",
"addressSpaceItems": [{
"name": "",
"nodeId": "ns=4;s=gBatch.set.ds.volt",
"datatypeName": "Float Array[5]"
}],
"valuesToWrite": [{"0":0,"1":109,"2":140,"3":200,"4":250}],
"topic": ""
}
Error response:

{
"nodetype": "write",
"injectType": "write",
"addressSpaceItems": [{
"name": "",
"nodeId": "ns=4;s=gBatch.set.ds.volt",
"datatypeName": "Float Array[5]"
}],
"justValue": true,
"value": {
"statusCodes": [{
"value": 2155085824
}]
}
}
Status code 2155085824 (0x80740000) indicates BadTypeMismatch.

Multiple Write Test (Mixed Results)

When writing multiple tags (a single Float and an Array):

{
"nodetype": "node",
"injectType": "write",
"addressSpaceItems": [
{
"name": "",
"nodeId": "ns=4;s=gBatch.set.ds.curr",
"datatypeName": "Float"
},
{
"name": "",
"nodeId": "ns=4;s=gBatch.set.ds.volt",
"datatypeName": "Float Array[5]"
}
],
"valuesToWrite": [
3.5,
{"0":0,"1":109,"2":140,"3":200,"4":250}
],
"topic": ""
}
Result:

Single Float writes successfully (status 0)
Array fails with BadTypeMismatch (status 2155085824)

OpcUaExpert is able to write the Array

Using Wireshark to capture successful writes from UaExpert shows that the array is being written with:

AttributeId: Value (0x0000000d)
Variant Type: Array of Float (0x8a)
ArraySize: 5

[Wireshark write array captuted.txt]
(https://github.com/user-attachments/files/17660652/Wireshark.write.array.captuted.txt)

Here the attributes of the Item by OpcUaExpert

[lucatralli]