Yea, you cannot send samples when you dont want to transmit. There isnt
really such a concept of that in GRC itself, but you certainly can
implement the blocks and control logic and connect them in grc. Someone
should make interesting use of those tagging features as well.
So, a “hack” that could be put into UHD (or perhaps gr-uhd) is that if
You could make a block to do this, a kind of shutoff block that forwards
the stream until it sees too many zeros. It could also generate an end
of burst stream tag do the uhd sink could properly end the burst.