python OPCUA package installation failed in Linux ARM32V7

[rowshan]

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This is a BUG REPORT for issues in the existing code.

If you have general questions, code handling problems or ideas, please use the:

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---

To save some time, please provide us following informations, if possible:

Describe the bug

I am trying to create arm32v7 docker image to run on MOXA edge device. But each time I am try to build the image locally it failed. The image i used it is arm32v7/python:3.9.

To Reproduce

Steps to reproduce the behavior incl code.

`FROM arm32v7/python:3.10-slim-buster
RUN apt-get update
RUN apt-get install -y --no-install-recommends build-essential gcc libxml2-dev libxslt-dev
RUN apt-get install -y python3-lxml
RUN python3 -m venv /opt/venv

Make sure we use the virtualenv:

ENV PATH="/opt/venv/bin:$PATH"
ENV OPCUA_FILE_LOCATION "/opt/sinewaveDB"
ENV OPCUA_SERVER_IP "opc.tcp://192.168.1.2"
ENV OPCUA_SERVER_PORT "4840"
RUN pip3 install setuptools-rust
RUN STATIC_DEPS=true
RUN pip3 install lxml==3.4.2 --use-pep517
RUN pip3 install --upgrade pip
RUN pip3 install --upgrade asyncio
#RUN pip3 install cryptography
#RUN pip3 install azure-storage-blob
RUN pip3 install opcua
RUN pip3 install -r requirements.txt

ENTRYPOINT ["/opt/venv/bin/python3","./app.py"]
`
Expected behavior

I am trying to run opcua client so it reads PLC datas via opcua server. Normal docker container works fine without any error arm64 docker image also wroks without problem; only arm32v71 has issue running opcua.
Screenshots

it cannot build or install lxml package and I have the following error

Version

Python-Version:3.10

python-opcua Version latest (e.g. master branch, 0.9):

[oroulet]

use opcua-asyncio. python-opcua is not maintained anymore (And yes opcua-asyncio will work because it does not rely on lxml

[rowshan]

Thanks for your reply! but I also tried with opcua-asyncio it failed for cryptography installation step in arm32v7/pytrhon:3.8. here is the error log:

Here find the dockerfile:
`FROM arm32v7/python:3.8-slim-buster
WORKDIR /sinewave

RUN pip3 install asyncua

CMD [ "python3", "client.py" ]`

[schroeder-]

Adding apt-get install libffi-dev ?

[schroeder-]

Also you maybe will need rust to compile so apt-get install rustc libffi-dev