Probe Function probe_function from grc_gnuradio import blks2 as grc_blks2 grc_blks2.probe_function( probe_callback=self.$(block_id()).$(function_name()), probe_rate=$probe_rate, ) set_probe_rate($probe_rate) Block ID block_id my_block_0 string Function Name function_name get_number string Probe Rate probe_rate 10 real out float Polls a function of an arbitrary block and writes the value to the output port. \ The block id is the id of another block in the flow graph. \ The function name is the name of a function in the said block. \ The function should take no arguments and return a floating point or integer number.