this thread is more or less extension of the thread:
It looks that my 3.6.4git versio doesn’t support message passing logic
within python, so I switched to another pc where I run 3.7.0. I assume
because there is no function for registering message ports, but when I
changed to 3.7.0, there was no that error any more.
No the problem is the following:
the block is very simple:
def __init__(self): gr.sync_block.__init__(self, name="msg_sender", in_sig=[numpy.int8], out_sig=[None]) self.message_port_register_out(pmt.pmt_intern('out_port'))
but when i run flowgraph, the following error comes out:
RuntimeError: msg_sender(2): insufficient connected output ports (1
From where came that output that I havent declared?