Mosquitto MQTT Broker

[Armin@netPI]

We have uploaded a new Docker image that turns your netPI into an MQTT broker: https://hub.docker.com/r/hilschernetpi/n...tt-broker/

[C@rlo5Sepulveda]

Hello Armin, I hope you're doing alright, I am just getting familiar with NetPI, I have some questions but I am going to start asking about Mosquitto MQTT Broker Docker container, the link you shared above does not exists anymore https://hub.docker.com/r/hilschernetpi/n...tt-broker/. I found a Github link: https://github.com/HilscherAutomation/ne...qtt-broker but it doesn't work.

is there any other option to install Mosquitto container on NetPI?, besides I would like to know if there is a Docker container for NIOT-E-NPIX-4DI4DO or how can I map this I/O Module thru Node-Red?

Thanks
Carlos

[Armin@netPI]

Hello Carlos,

you are right the Docker image is no more.

The reason why I decided to remove the Hilscher docker image for Mosquitto is quite simple. The organizsation Mosquitto itself offer a very official Docker image a long time ago under https://hub.docker.com/_/eclipse-mosquitto. So hence it does not make sense for Hilscher to offer it.

So the image to load is "eclipse-mosquitto". As you can read it on the page you need to add the ports 1883:1883 and 9001 :9001 to make it available to the "outside world".

If there is something you want to change in the mosquitto.conf file then you can open a console "/bin/ash"

   

in netPI's Docker web GUI and make your edits then usig the editor vi for example

   

Thx
Armin

[tad]

Dear Armin,

I am trying MQTT communication using netPI.
I deployed eclipse-mosquitto.
I am using "mqtt in" and "mqtt out" nodes in Node-Red.

But, status indicator below the nodes shows 'connecting', not 'connected'.

If you have any concerns, could you give me some advice?

Best regards,

[Armin@netPI]

Well for a better view I recommend to all MQTT users to install the tool MQTT-Explorer http://mqtt-explorer.com/ under windows (instead of Node-RED).

This tool is for free and much better to explore a running MQTT broker since it monitors ALL topics at once.

As next I installed the same eclipse-mosquitto:latest as you did. I also mapped the ports 1883 and 9001 ... and guess what ... the MQTT broker is not reachable via MQTT Explorer. So there seems to be a general problem with the latest version

When you click on the container and watch the log file it says:

Code:

1614766138: mosquitto version 2.0.7 starting
1614766138: Config loaded from /mosquitto/config/mosquitto.conf.
1614766138: Starting in local only mode. Connections will only be possible from clients running on this machine.
1614766138: Create a configuration file which defines a listener to allow remote access.
1614766138: Opening ipv4 listen socket on port 1883.
1614766138: Opening ipv6 listen socket on port 1883.
1614766138: Error: Address not available
1614766138: mosquitto version 2.0.7 running

"Starting in local only mode .Connections will only be possible from clients running on this machine" ? I don't know what this means right now. Maybe this is the explanation why it does not reachable from remote machines. 

I think on the MQTT broker landing page https://hub.docker.com/_/eclipse-mosquit...escription you will find more about this "local" mode. At the moment I am clueless. Earlier version worked well and with no problems at all.

Thx
Armin

[Armin@netPI]

Well I read more details about the very latest version of Mosquitto with a breaking major change due to security reasons here:

https://mosquitto.org/documentation/migrating-to-2-0/

This change will have influence on the very latest version of Mosquitto Docker image version 2.x as well and explains, why the images does not work right away. I suppose after deploying the docker container, you need to edit the configuration file in the container manually. 

Of course it is always possible to load instead of the "eclipse-mosquitto:latest" = 2.x version the old version 1.x with "eclipse-mosquitto:1.6.13" instead

[Armin@netPI]

I got it working now also with version 2.x.

Based on the documentation at https://mosquitto.org/documentation/migrating-to-2-0/ I added two lines additionally in the mosquitto configuration file in the container named

Code:

/mosquitto/config/mosquitto.conf

The two lines are

Code:

listener 1883
allow_anonymous true

Then I restarted the container and everything went well.

P.S.: I saw in your container screen shot you enabled the "privileged" flag. This is not necessary at all to set for the mosquitto container.

Thx
Armin

[Armin@netPI]

Here is how to edit the configuration file in the container manually using the embedded container console in 7 steps:

1. Click the embedded console icon of the container
2. Choose "/bin/sh" as console terminal service and press connect
3. Call "vi" Linux editor plus the file to edit with "vi /mosquitto/config/mosquitto.conf"
4. Press key "i" in the opening editor to activate the editor mode to "inserting"
5. Insert the lines as first lines in the file
   "listener 1883"
    "allow_anonymous true"
6. Press key "Esc" and then ":" then "w" and then "q" which is the command "write quit".
7. Then restart the container

Here is a picture of the steps 1 to 5

   

[tad]

Dear Armin,

Thank you very much for your quick and kind response.
I tried 2 things according to your information.

1) I loaded eclipse-mosquitto:1.6.
2) I loaded eclipse-mosquitto:latest and modified the file 'mosquitto.conf' to add 2 lines.

Both of the above, the MQTT communication worked successfully.
I confirmed that from both of the debug view by debug node and MQTT Explorer.

I really appreciate your support!!!
Best regards,