Can't connect with mosquitto (CPU313C and CP343-1 Lean) about mqtt-siemens-s7-300

[RoanBrand]

Hi, I unfortunately do not have much of an answer for you, sorry.
I started this ages ago before there was much regarding MQTT when it came to PLCs.
And I myself haven't worked with them in a while.

I saw a while ago there has been later development on MQTT client libraries for Siemens.
Maybe I can refer you to this after a quick search: https://cache.industry.siemens.com/dl/files/872/109748872/att_1006438/v4/109748872_MQTT_Client_DOKU_V2-1_en.pdf

That said, just after I started this @CarstenMaul did a lot of refactoring and changes.
Maybe he can help with this specific question/problem.

[Jansen1443]

Hi GerritMeu,

Was curious if it had still worked out. We have several s7-300 and s7-400 and would like to connect them to MQTT as well. I just can't manage to get RoanBrand's example into step7 v5.6. Can you help me with this?

Greetings and thanks in advance.

[GerritMeu]

Hi GerritMeu,

Was curious if it had still worked out. We have several s7-300 and s7-400 and would like to connect them to MQTT as well. I just can't manage to get RoanBrand's example into step7 v5.6. Can you help me with this?

Greetings and thanks in advance.

Hi Jansen1443,

It worked, but because I had a lack of trust that it complies with the MQTT v3.1.1 specification, I use Node-RED now. Also for the Sparkplug B implementation. I had help @ the Siemens forum to get it going: https://support.industry.siemens.com/forum/ww/en/posts/mqtt-protocol-with-cpu314c-2dp-and-cpu315-2dp/289286/?page=0&pageSize=10

I added my project wherein it worked, you can see the result also in the forum that I shared. In the project, I also added a VAT table wherein you can connect, disconnect etc.

Good luck!

Uns_mqtt_sparkplugb_17OCT22.zip