gr-eventstream <https://github.com/osh/gr-eventstream> includes code that
does a similar thing. It has not been ported to recent GR releases, though.

On Fri, Oct 30, 2020 at 11:47 AM Tim Huggins <huggins.timo...@yahoo.com>
wrote:

> I am trying to create a custom block that outputs data if there is no
> input. The goal is to create a steady stream of data to the OFDM
> transmitter block even though the real source data is bursty. I've been
> working unsuccessfully to come up with a solution and I am starting to
> think it may not be possible. The idea would be to check the size of the
> input data and if it is 0 then send a filler pattern; is this possible?
>
> Thank you,
>
> Tim
>

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