Dear all,
While experimenting with hier_block2 I noticed that connecting an input
message port appears to disconnect an unrelated stream output port. I've
attached a simple example Python script to show what I mean.
Basically, the example script creates a hier_block2 with a null source and
throttle block. The hier_block2 is then connected to a null sink.
Furthermore, it has an input message_port for control messages. The script
runs fine when the input message_port is not connected. However, when
connecting the message_port, the following error is returned:
RuntimeError: hier_block_test(2): insufficient connected output ports (1
needed, 0 connected)
Am I missing something or might this be a bug? If I change the hier_block2
to have 0 stream outputs (in the output signature), the error goes away,
but in my use case I need to have one stream output and one control message
input.
Kind regards,
Pieter Robyns
#!/usr/bin/env python2
import weakref
from gnuradio import blocks, gr
from time import sleep
import pmt
class hier_block_test(gr.hier_block2):
def __init__(self):
gr.hier_block2.__init__(self,
"hier_block_test",
gr.io_signature(0, 0, 0), # Input signature
gr.io_signature(1, 1, gr.sizeof_gr_complex)) # Output signature
nsrc = blocks.null_source(gr.sizeof_gr_complex)
throttle = blocks.throttle(gr.sizeof_gr_complex, 20000, True)
self.connect((nsrc, 0), (throttle, 0))
self.connect((throttle, 0), (weakref.proxy(self), 0))
self.message_port_register_hier_in("test")
if __name__ == "__main__":
tb = gr.top_block()
message_strobe = blocks.message_strobe(pmt.intern("debugmsg"), 1000)
hier = hier_block_test()
nsnk = blocks.null_sink(gr.sizeof_gr_complex)
tb.connect((hier, 0), (nsnk, 0))
introduce_bug = True
if introduce_bug:
tb.msg_connect((message_strobe, "strobe"), (hier, "test"))
tb.start()
sleep(10)
tb.stop()
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