Re: single pad sink hier block fails but similar two output block works

My hier block runs if I add a second output pad connected to a null source:     gr.hier_block2.__init__(     self, "null output hier",     gr.io_signature(0, 0, 0),     gr.io_signature.makev(2, 2, [gr.sizeof_float*1, gr.sizeof_float*1]),     ) Howeve

Can't get message passing working when calling a class method from main()

I am attempting to send a message from an OOT module to a gr-display module. This task is part of a large project with a complicated flowgraph. Therefore I am going to provide only the pertinent part of the code. I hope this is sufficient to understand my problem with some explanation. The ft8_

single pad sink hier block fails but similar two output block works

Version: 3.10.11.0-1 I have a simple hier block with two output pad sinks that works as expected. These two outputs are nearly identical but independent streams. I created a very similar hier block with only a single stream and one output pad sink.  Executing a flow graph containing the latter