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### Versions

* Python:
* OS:
* Pymodbus:
* Modbus Hardware (if used): 

### Pymodbus Specific
* Server: tcp/rtu/ascii - sync/async
* Client: tcp/rtu/ascii - sync/async

### Description

What were you trying, what has happened, what went wrong, and what did you expect?

### Code and Logs

```python
 # code and logs here.

```
