Document Digital RF channel/directory structure and make it more visible

[jacobagilbert]

After making a recording using the Digital RF Sink block, I get the following error attempting to replay from there:

ValueError: No channels found: top_level_directory_arg = /home/jacob/H5test. If path is correct, you may need to run recreate_properties_file to re-create missing drf_properties.h5 files.

The directory, however, does contain the specified drf_properties file:

`jacob@ubuntu:/opt$ ls /home/jacob/H5test/*
/home/jacob/H5test/drf_properties.h5

/home/jacob/H5test/1970-01-01T00-00-00:
[email protected] [email protected] [email protected] [email protected]
[email protected] [email protected] [email protected] [email protected]
[email protected] [email protected] [email protected]`

[ryanvolz]

This is a clearly a case where the documentation (at least what's there so far) needs work. There are two ways to make this work:

1. Use '/home/jacob' as your top_level_directory_arg. It will then find the subdirectory of 'H5test' as a valid channel and you should be able to proceed.
2. Typically, we would use one further directory level to record data, using '/home/jacob/H5test/<channel_name>' in the Digital RF Sink block. Then we think of 'H5test' as the top-level experiment directory containing subdirectories of channel data. In that case, using '/home/jacob/H5test' as the top_level_directory_arg would be what works.

Let me know if either of those doesn't work!

[jacobagilbert]

That works. Thanks for the information. The throttle doesn't appear to be working but I think thats another issue. I prefer to use an explicit throttle block in GR anyway.