Re: [Discuss-gnuradio] Help needed with message ports

Hi Volker - Just to clarify:

You've added an -optional- input async message port to a block that currently does just streaming. If you -do not- try to connect to this new port, then everything works as desired & as before. If you -do- try to connect to the port then you get the runtime error "insufficient connected output ports (1 needed, 0 connected)". Yes?

"Once upon a time" ... there was, and as it turns out still is (just tried using the current GIT master of GR), a bug in the code that handles connections for mixed streams and -input- async messages, which results in the runtime error you're encountering. I can provide a very simplified OOT that shows this error; I tried to track it down once but got sidetracked & never figured it out. Maybe I'll give it a go again this coming week ... or, maybe you can?

Sorry for the bad news! - MLD

On Fri, Jul 20, 2018, at 6:28 AM, Volker Schroer wrote:
> Hi,
>
> I'm trying to add an message port to my  working oot module fcdproplus
> to be able to control the frequency by an message from a qtgui sink.
>
> I used the analog signal source as guide and implemented a message sink
> in the grc description, registered the in port, and defined  a handler
> function like described in the tutorial.
>
> I can run my example of a simple fm receiver as before, but when I
> connect the message out port of a qtgui sink to my message in port of my
> oot block,
>
> I get the following error message:
>
>
> ./FMRadio.py
> INFO: Audio source arch: alsa
> Funcube Dongle Pro+ found as: plughw:3,0
> Dongle sucessfully initialized
> Result of Action :+++++
> FCDAPP 20.03
>  Lna gain enabled
>  Mixer gain enabled
> If gain set to: 10
> Set Frequency to: 94.3 KHz, corrected to: 94300 Khz
> INFO: Audio sink arch: alsa
> Traceback (most recent call last):
>   File "./FMRadio.py", line 277, in <module>
>     main()
>   File "./FMRadio.py", line 266, in main
>     tb.start()
>   File
> "/usr/local/gnuradio/lib64/python2.7/site-packages/gnuradio/gr/
> top_block.py",
> line 109, in start
>     top_block_start_unlocked(self._impl, max_noutput_items)
>   File
> "/usr/local/gnuradio/lib64/python2.7/site-packages/gnuradio/gr/
> runtime_swig.py",
> line 5678, in top_block_start_unlocked
>     return _runtime_swig.top_block_start_unlocked(r, max_noutput_items)
> RuntimeError: fcdproplus(3): insufficient connected output ports (1
> needed, 0 connected)
>
> These are the connections:
>
>
>        ##################################################
>         # Connections
>         ##################################################
>         self.msg_connect((self.qtgui_sink_x_0, 'freq'),
> (self.fcdproplus_fcdproplus_0, 'freq'))
>         self.connect((self.analog_fm_demod_cf_0, 0),
> (self.audio_sink_0, 0))
>         self.connect((self.analog_fm_demod_cf_0, 0),
> (self.audio_sink_0, 1))
>         self.connect((self.fcdproplus_fcdproplus_0, 0),
> (self.low_pass_filter_0, 0))
>         self.connect((self.fcdproplus_fcdproplus_0, 0),
> (self.qtgui_sink_x_0, 0))
>         self.connect((self.low_pass_filter_0, 0),
> (self.analog_fm_demod_cf_0, 0))
>
> If I remove the line
>
> self.msg_connect((self.qtgui_sink_x_0, 'freq'),
> (self.fcdproplus_fcdproplus_0, 'freq'))
>
>
> from my python script he error message disappears.
>
> What am I doing wrong?
>
>
> Any help is appreciated.
>
> -- Volker
>
>
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