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Old March 25th, 2020, 10:16 AM   #1
PLC
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MQTT experts

Any MQTT experts here?
Iím trying to learn and test an s71200 client with a MQTT broker/server.

Can anyone suggest a simple broker/server I can use on a pc ? (That you have used)

Just something simple to send any data back and forth
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Old March 25th, 2020, 10:21 AM   #2
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The gold standard here is Mosquitto


You should be able to Google some nice setup guides too.
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Old March 25th, 2020, 10:23 AM   #3
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So you used it?

If so and any tips to get started ?
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Old March 25th, 2020, 10:39 AM   #4
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Yes, it's very simple to use.


I would recommend watching a Youtube video or Googling a tutorial on how a broker works
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Old March 25th, 2020, 11:07 AM   #5
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Will do
Thanks
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Old March 25th, 2020, 12:29 PM   #6
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If you have just started experimenting then I think it's easier to use an online broker.

I use the following brokers to experiment with MQTT on Codesys Windows Runtime which can run on PC with any need for actual PLC.
www.cloudmqtt.com
or
https://www.hivemq.com/public-mqtt-broker/

Does Siemens offer a MQTT library for S7-1200?
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Old March 25th, 2020, 12:47 PM   #7
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I'm the Scada administrator for Pioneer Oil and we have several remote (very remote) locations that all of the data to and from these locations use the MQTT protocol.

We use Ignition Scada, Cirrus Link, Maple Systems, to handle all our MQTT needs.

Our remote locations are connected back to our Scada Server with our own "Private Cellular Network".

I can say if your looking at MQTT, I would recommend using the "Sparkplug B 3.1.1" protocol.

This is my 2 cents worth.
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Old March 25th, 2020, 12:59 PM   #8
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Quote:
Originally Posted by kallileo View Post
If you have just started experimenting then I think it's easier to use an online broker.

I use the following brokers to experiment with MQTT on Codesys Windows Runtime which can run on PC with any need for actual PLC.
www.cloudmqtt.com
or
https://www.hivemq.com/public-mqtt-broker/

Does Siemens offer a MQTT library for S7-1200?

Here it is.


Edit Sorry, wrong one. Here is the right one; link.

Last edited by kalabdel; March 25th, 2020 at 01:22 PM. Reason: wrong link
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Old March 25th, 2020, 01:22 PM   #9
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I tired MQTT last year with S7-1200 and could not make it work. Going by the memory of a man who doesn't like remembering I think it had something to do with authentication. I was able to connect to a local broker but I could not connect to an online one. I believe S7-1200 does not support secure communication and having to open a port that was blocked by my ISP. Can't seem to find my notes.
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Old March 25th, 2020, 03:41 PM   #10
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Quote:
Originally Posted by kalabdel View Post
I tired MQTT last year with S7-1200 and could not make it work. Going by the memory of a man who doesn't like remembering I think it had something to do with authentication. I was able to connect to a local broker but I could not connect to an online one. I believe S7-1200 does not support secure communication and having to open a port that was blocked by my ISP. Can't seem to find my notes.

Latest FW for 1200 (v4.4, requires v16) allows for secure communication.
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Old March 25th, 2020, 03:43 PM   #11
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Fantastic, now we're talking.


Thanks mk42.




Edit: I just realized secure communication was available also with 4.3 which is the version I was working with. I will have to dig in more to find out what issues I had; I'm quite sure it had to do with connecting to remote server.

Last edited by kalabdel; March 25th, 2020 at 04:00 PM.
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Old March 25th, 2020, 08:38 PM   #12
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Originally Posted by kalabdel View Post
Edit: I just realized secure communication was available also with 4.3 which is the version I was working with. I will have to dig in more to find out what issues I had; I'm quite sure it had to do with connecting to remote server.
I guess I was one off, whichever. I think DNS showed up in the 1200 somewhere along the way as well. New FW def does add OPC UA to the 1200, which is nice.

I've heard that dealing with certificates is terrible, especially when you start mixing in cloud providers. We (controls engineers) don't know the terminology, and the directions basically say "here's how it works without security. To be secure, add certificates" without covering the steps required.

Last edited by mk42; March 25th, 2020 at 08:41 PM.
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Old March 26th, 2020, 05:05 PM   #13
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Quote:
Originally Posted by bjh View Post
Yes, it's very simple to use.


I would recommend watching a Youtube video or Googling a tutorial on how a broker works
Bjh

Works great !
Just like you said
Thanks
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Old March 26th, 2020, 07:37 PM   #14
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I see my colleague playing around with Node-RED from time to time. It is powerful, appears quite easy to use, and has some great dashboard features.


Here is a simple example for something similar you are doing: https://www.youtube.com/watch?v=O9sCM_l7SiI
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Old March 26th, 2020, 09:09 PM   #15
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Jeev
Wow. Now that’s very interesting.
I’m digging more and more with MQTT and I haven’t seen that before
Great info
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