Passing a list via message

Hello everybody and HNY !

I have almost finished writing (Gnuradio 3.10.1.1) an OOT block, at the moment an Embeeded block, that is able to produce the data needed for satellite tracking (azimuth / elevation / doppler / etc) without having to have an external application, in my case Gpredict.

The block is timed by a Message Strobe and the output is then passed to variables via "Message pair to Var."

Everything works as expected, except for passing a list, via message, that contains the names of the satellites.

This list will then be used in a QT Chooser to select the satellite to track.

This is the code snippet:

            sat_list = list(sats.keys())

            print (sat_list[:5])

            tag = pmt.string_to_symbol("sats")

            value = pmt.to_pmt(sat_list)

            sats_msg = pmt.cons(tag, value)

            self.message_port_pub(pmt.intern('sats'),sats_msg)

and this is the consolle output:

******* from print(sat_list[:5] ********

['AO-07', 'UO-11', 'AO-16', 'LO-19', 'AO-27']

******* MESSAGE DEBUG PRINT ********

(sats . #(AO-07 UO-11 AO-16 LO-19 AO-27 ...... and so on )

It is evident that the message payload "is" a list but all values are not separated by the commas or even superscripts ......Any hints? 

Looking at online documentation I'm not able to find so much examples about passing a list via pmt.

Find in attachment grc file screenshot.
Tnx for any info / suggestion ;-)

Best regards de      Vittorio, I3VFJ

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