As i told you in the "your" OPCUA forum:
The problem is not that ESP-32 does not support the Open OPC UA lib,
The problem is the library itsself.
"Matrikon" provides working examples for some emdedded plattforms based on lwip.
I showed a reference based on the XMC_4800 Ethercat relax kit to you
There solution (comercial) is runnung smoth and is customized very easily.
The reason why there are only a few (none currently, working as i know) open source libraries about OPC UA exits,is that providing an OPC UA SDK, expecially for embedded systems is part of buisiness modells and comercial products.
Very subrisingly, not everything on the internet is for free
It is not up to ESP-32 to do the work it is up to us (contributors of open OPC UA stacks).