Hi Eugene, > How would you display the current state (e.g. mean > power from a probe mag^2) your use case sounds very straightforward: use the QT GUI Number Sink. But as explained in my previous email: just write the logic you need. (we might want to wrap this in an off-the-shelf block). I'm attaching a flow graph with three options to solve your problem, on the right half of the flowgraph, top to bottom: 1. straightforward number sink 2. a minimal python block that counts to N items, then emits a message containing the value at that position, repeats 3. a minimal python block that, triggered on an external message, emits the last value as message. To display a message's content, you can use the QT GUI Message Edit Box in "static" mode. Note that you can generate the triggers for the third option inside your hier block (as I'm doing here with the Message Strobe), or use a "Pad Source" to allow the user of your block to trigger externally (for example, manually with a Qt GUI Msg Push Button). Added a disabled Pad Source to clarify that concept. > or probe_rate Probe Rate produces messages. I personally mostly connect that to a Message Debug's Log port and read the console. But I can see where you're coming from! You can write a python block with a input message port with a handler. (see the message-triggered from above for an example). The block would furhtermore have an output message port, and no stream in- our outputs. The handler would do something like def msg_handler(self, msg): self.message_port_pub(self._msport_out, pmt.dict_ref(msg, pmt.mp("rate_now"), pmt.from_float(0.0))) to convert from the dictionary that Probe Rate emits to the rate now message. We might also want a ready-made block that does that for you in general. Best, Marcus
