Siemens LOGO! V8.4: Unboxing and Live Demo of Bi-Directional MQTT Communication with Raspberry Pi 5

As we discussed in previous videos, Siemens has recently released a significant upgrade to its smallest controller, LOGO! In this new video, the first of its kind on the internet on this topic, we unbox a brand new LOGO! V8.4, compare it to older LOGOs, and demonstrate how to configure and program it to establish bi-directional communication between the LOGO and any MQTT broker. We'll explore publishing data to a Mosquitto MQTT Broker running on a Raspberry Pi 5 and subscribing to data from the LOGO! If you're seeking compact and low-cost hardware for your IIoT project, don't miss out on this!
Have you had a chance to test the new LOGO! V8.4? Let us know what you think about the recent upgrade.

[@thorstenfricke3257]

1000 thanks

[@Ind4.0]

Great as always. Thank you for sharing. I was looking for a tutorial on this topic for a while 👍

[@blociot]

Thank you for watching.

[@mohammedrezk8072]

this is the first video i have seen on your channel and it is a very informative and straight forward , i like it, please keep going.

[@blociot]

Thank you for watching. Hope you enjoy the rest of tutorials.

[@thomassaook7787]

This video was very useful, many thanks

[@blociot]

Thank you for watching.

[@stevenrb5168]

Hi my friend congratulations for this excelent video, I have a problem, i have the Logo 8.4, I see my ipv4 on windows and my PLC is in the same subred, but after make all the steps that you show to connect with mosquitto, doesn't connect, only I see connecting and after that show me a message "server connection error" maybe do you know what i have to do?

[@blociot]

Thank you for your comment. Do you see the connection error? On LOGO side or on the MQTT client? You need to make sure your Mosquitto settings match what you enter in LOGO configs. If you have a username and password on the Mosquitto broker, you need to let LOGO know to connect!

[@marekbaty3151]

Hi, great video about new hardware version V8.4, thank you very much for that. Besides, could you share the information, where such (older) stand with older LOGO hardware can be available?

[@blociot]

Hello Marek, Thank you for watching and your feedback. I received the demo box from my local Siemens office in Canada. I'm not sure if it's available in other regions. But I'd suggest contacting someone at Siemens in your area and ask for a similar demo.

[@PM-pp3so]

I don't understand if logo can be used only with MQTT broker or comunicate in a local red. ? Can interact with homeassistance ? thanks

[@blociot]

Hello, LOGO can be a MQTT client. It cannot be an MQTT broker. So if you have an MQTT broker, LOGO can publish or subscribe to data on the broker. It can also be connected to Homeassistant as an MQTT sensor, etc. with JSON payload

[@PM-pp3so]

@@blociot Estamos hablando de una comunicación a nivel local... sin internet ? gracias.

[@PM-pp3so]

I use a VPN router to see LWE website but with Mqtt protocol can someone make an smartphone app with datas from an MQTT broker ? many thanks

[@blociot]

Sure you can. Facebook messenger app is a good example that mostly uses MQTT for communications.

[@PM-pp3so]

@@blociot Entonces si el logo envia las variables en un cloud como AWS. Un desarollador de app para movil podria crear una app ?

[@fh1772]

Is it possible to call urls / webhooks from the LOGO?

[@blociot]

Unfortunately, not yet. But there might be an unofficial way. For now, MQTT and email seems to be the best way to work with events. For sure middleware can be used too.

[@jonathanlee1362]

Like the video. have you tried the email set

[@blociot]

Thank you for watching. That's on my list for the next video. Should be ready this week.

[@Artur1959]

I would like to see how you connect one LOGO 8.4 to another LOGO 8.4 over MQTT. I can so far publish ONE LOGO to the broker, but I can´t subscribe a second LOGO 8.4 to the topic, because some kind of json string is required to publish to the subscriber.

[@blociot]

Hi Artur. I have not tested two LOGOs communication over MQTT but you don't need to handle any JSON. You just need to define the same topics name in both LOGOs and map a certain memory area within the pub/sub. I'll create another video for it.

[@thorstenfricke3257]

i cant find the sw 8.4 anywhere in the german internet. please could send me a link?

[@blociot]

Hi Thorsten, You can try this link on SIOS: This is an upgrade. So you will need to have an oldef version su h ad v8.3 installed before running this upgrade support.industry.siemens.com/cs/document/109826553/download-and-installation-instructions-for-logo!-soft-comfort-upgrade-v8-4?dti=0&lc=en-US

[@thorstenfricke3257]

@@blociotthank you! i downloaded a demo from those link you provided. but i dont know how to make a non demo version from it. i have to find out

[@blociot]

@@thorstenfricke3257 if you had a previous version of LOGOsoft comfort on your machine, you don't need to do anything else. The file on the link upgrades your existing software. Otherwise, you have to do a one time purchase from your local Siemens rep. It's not an expensive software

[@thorstenfricke3257]

@@blociot thank you

[@jhonnyputtini8514]

Can do you a video about LOGO! CIM?

[@blociot]

Hi Johnny, I don't have the CIM hardware but I'll put it on the list for upcoming videos. Thanks for the idea.