Hello everyone !!

[Elmatbaisaad]

does anyone got Call to undefined function ModbusTcpClient\Network\mb_strtolower() error
here is my code for reading holding registers :

[aldas]

You need to have PHP mbstring extension installed

[Elmatbaisaad]

i tried but i failed , i m using docker with php fpm , please do you know how can I install the extension ?

[aldas]

maybe this helps https://stackoverflow.com/a/66980297/2514290

[Elmatbaisaad]

Thank i think it works because know im gettinh a other error , this is the error o got :
error.pdf

[aldas]

you need to provide correct IP for that. Unless you run your container with --network="host" your container has their "own" network stack/ip and needs to know IP where that python server is running. If this python modbus server is another Docker container you can use that container name instead of ip.

Search for "docker network between containers" from Google. ala https://www.tutorialworks.com/container-networking/ etc

[aldas]

docker-compose is a nice way to create multicontainer setups.

[Elmatbaisaad]

OK thank you i will try those suggestions.

[Elmatbaisaad]

The probleme here is that my server isn't in any container he is runing in my local machine

[aldas]

In that case instruct docker to use host network for that container. See https://docs.docker.com/network/network-tutorial-host/