tcpdump -vv port 1883
If the host is 127.0.0.1
tcpdump -i lo port 1883
and
lsof -i :1883
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The broker is hosted on another Raspberry Pi, so I don’t know if this is the right approach, but I installed Wireshark, set the MQTT script IP to my MacBook’s and tried to trigger the script with an inbound call. Nothing. So I don’t THINK the script is actually ‘working’. Yeah, great technical term there, dan_ce! What I mean is, I don’t think the script execution is proceeding to the point where it attempts to make a TCP/IP connection. Hmmm. I wish I could just call the script (with the same arguments) directly from bash because then maybe it would print some useful diagonistic info back.
If you are out of your depth, then perhaps
might be simpler to debug, it uses mosquitto_pub to connect to your broker, not a long unsupported library from somewhere. It also runs well on a raspberry.
I’m definitely out of my depth. I also think I’ve answered @jfinstrom, the script I think is broken with current version of python.
When I run it, I get “ImportError: No module named mosquitto”. I think I need to attempt to move the script over to Paho…
Possibly an even bigger “over my head” there migrating a python script, how comfortable are you with python?
In bash
mosquitto_clients (mosquitto_pub/sub)
are all you need to make sure you you can see, publish and subscribe to your broker’s available topics , until facile with all that then I think you will find it all a long row to hoe.
Thanks, Dicko. I really appreciate your help today. I’ll see how I get on. At the moment I’m playing with your most recent suggestion. 
WAS JUST ABOUT TO GIVE UP AND GOT IT WORKING!! THANKS @DICKO!!
(sorry to shout).
COOL!!!
By the way, it = your simpler mosquitto method - I had to tweak the code slightly but all good!!
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Please elucidate, We always appreciate peer review . .
[from-trunk]
exten => _X.,1,trysystem(mosquitto_pub -h 192.168.2.11 -t 'calls/in/${EXTEN}' -m '${CALLERID(num)}' )
exten=> _X.,n,Goto(from-pstn,${EXTEN},1)
[your-custom-mqtt-inbound]
exten => s,1,trysystem(mosquitto_pub -h your.mqtt.broker -t 'your/topic/${EXTEN}' -m ${CallerID(number)} )
exten=> s,n, goto(from-pstn,${EXTEN},1)
The main change was to the capitalisation of the CallerID/CALLERID (it seemed to matter!).
Thank you! So happy to get this working.
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Just fyi, this is probably the reason pastebin didn’t work. I assume it’s a distro feature.
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