Gateway with a Modbus RTU server and client

[Mikael Andersson]

Hi,

Can someone point me in the direction to an example or explain how to best implement a gateway function with a Modbus RTU server and a Modbus RTU client.

Currently I am using the Python class Thread to create a Modbus RTU client thread before starting the Modbus RTU server. I am also using this:

https://github.com/riptideio/pymodbus/blob/master/examples/contrib/thread_safe_datastore.py

This seems to work, but is there a better, more reliable way to do it with e.g. asyncio?

I want the gateway to normally pass the data on unaltered. As far as I understand this is realised in this example:

https://github.com/riptideio/pymodbus/blob/master/examples/contrib/serial_forwarder.py

But, since I want to alter the data, based on a condition, above example is probably not relevant to use as a foundation.

Thanks,

Mikael

[Mikael Andersson]

I found a solution based on the examples serial_forwarder and custom_message. :)

Thanks,

Mikael