MQTT over QUIC

[sohanpatil1]

Hello,

I am trying to send payload from a publisher to a subscriber implemented in python. How do I set it up such that it works with MQTT over QUIC? The README says it is capable of running with EMQX v5.

I have access to macOS M1 and Ubuntu 22.04 and I am open to working on either depending on what you recommend for this package.

Anything helps, Thanks

[wanghaEMQ]

Yes! It works with EMQX v5.x! I will update the readme and provide a simple tutorial about installation and its requirement later.

[wanghaEMQ]

You may need to modify the MQTT server address in examples/mqttpub.py and examples/mqttsub.py. And the msgs sent or received are on QUIC protocol by default.

[sohanpatil1]

Thanks for the quick response and offering the instructions for setting it up. I had two concerns,

• mkdir -f build is one of the commands for installing msquic to the system. Is this correct? What should it be instead?
• When I try pip3 install -e . in the pynng-mqqt directory, I see this error
• When I tried sudo apt install libssl, Linux was unable to locate package libssl. I added libssl3 instead. Please let me know if this needs to be corrected

How do I fix this? I searched online but couldn't figure it out. Thanks, Sohan

[wanghaEMQ]

mkdir -f build is one of the commands for installing msquic to the system. Is this correct? What should it be instead?

I am sorry for my mistake. The command should be mkdir -p build.

When I try pip3 install -e . in the pynng-mqqt directory, I see this error

Maybe a version mismatch happened on cffi. cffi-1.15.1 is requires. But only cffi-1.15.0 be found on your system.

When I tried sudo apt install libssl, Linux was unable to locate package libssl. I added libssl3 instead. Please let me know if this needs to be corrected

Is there are libssl-dev package found?

[sohanpatil1]

I checked my cffi installation version, it is 1.15.1. I checked it with 'pip show cffi'. Yes there is a libssl-dev package and I have added it. However, still getting the same error.

I am using python 3.10.6

[wanghaEMQ]

Try to downgrade cffi to 1.15.0

sudo pip3 install cffi==1.15.0

Better if you remove it first

[sohanpatil1]

I downgraded cffi to 1.15.0. I am following this website for assistance. I ran these commands to make it work. I used sudo when I realized there were permission issues. However I am still stuck.

I have printed my console below:

[wanghaEMQ]

Your local installation (/home/ubuntu/.local/lib/python3.10/...) failed. When you try to run the mqttsub.py. It finds the pynng in your local installation first. But not your global success one (/usr/local/lib/python3.10/...).

Perhaps you could run with sudo. Or remove the local failed one. :)

[sohanpatil1]

I believe I have safely removed the local one. When I run the 2 python files (mqttsub.py and mqttpub.py), they both stop at async-await on line 22/24 and no connection message is sent. I have reviewed the files to see where the issue maybe, but no luck. Is it because of the mqtt server address? Any help would be greatly appreciated!

EDIT : I searched on EMQX's website and I noticed "mqtt-quic:127.0.0.1:14567" for QUIC and looks like it is correct. What's causing the issue?

[wanghaEMQ]

Did you forget to start your emqx broker? or the option in the configuration which enables QUIC? You could check if there are any processes listening 14567

sudo lsof -i:14567

[sohanpatil1]

Yes you were right. I did not have EMQX installed on the Ubuntu22.04 instance. I am now working on Ubuntu 20.04. All my progress so far was for the 22.04 installation. My question now, is for the new installation on Ubuntu 20.04

On running 'pip install -e .' I get a response that says pynng is successfully installed. However I don't see it in pip list or pip list --user. This is my pip list

[wanghaEMQ]

Plz also show yoursudo pip list

[sohanpatil1]

[wanghaEMQ]

Do you want to import pynng to your project?

pip install -e . will install pynng in an editable mode (something like debug mode). If you want to install pynng to your ubuntu20.04 instance and import it to your project. pip install . should works. Then you can find it in pip list.

[sohanpatil1]

Thanks! It worked, and I am able to use it as expected for Ubuntu20.04!