TransmissionProgressListener (identity 20230420 API)

```
public interface TransmissionProgressListener
```
A generic interface for sending progress updates of a data transmission.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`onProgressUpdate(long progress, long max)`	Callback to notify subscribers of progress updates.

- Method Detail
  - onProgressUpdate
```
void onProgressUpdate(long progress,
                      long max)
```
    Callback to notify subscribers of progress updates. The number of times this callback fires depends on the transport implementation. Subscribers can expect that on successful completion of a transmission a call to this function will fire with progress == max.
    
    Parameters:
    
    progress - Progress value (<= max)
    
    max - Maximum progress value (>= progress)