Hmm what is the minimal version?? I thought Tasmota was… hmm Tasmota?
I ordered this one:
And some wires.
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I guess Udo was talking about the Sonoff device and its compatibility with Tasmota
I dont quite get it…
The Sonoff device is the POW R2. But I have no idea what the “minimal version” is.
As said by Udo, Tasmota got bigger and bigger. Now you can’t directly update, because during the is process of the update via Wifi the device would need to have both version stored (actual version running and the new one for the update). To overcome a minimal version was created, running the automated update will first download the minimal version and as a second step the desired “full” version.
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Ahh, okay I see now… thanks for clarify this one. Hopefully the FT232Rl will arrive today or tomorrow. Then I´ll go into battle 
If browsing to https://github.com/arendst/Sonoff-Tasmota/releases/tag/v6.6.0, you will find a list of binaries for flashing (Assets, at the end of the page). In this list you will find the sonoff-minimal.bin and some other “commonly used versions”.
I just installed the TasmoAdmin in a docker container. It shows a nice interface after searching the network and updating all devies is easy as well as setting some parameters.
Regarding mqtt ist is always agood idea to have a mqtt client like mqttspy to check if it is possible to connect to the mqtt brocker and to check if manual comands are reaching their target
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Wow, that seems to be a nice option! Wasn’t aware of that software…
Found it while implementing the SonoffPow for my solar panels 
Did you install the JSONPath Transformation?
yes, it is installed
This might sound stupid, but where TF do I install the JSONPath Transformation? Ican not find it under add-ons in PaperUI!?!
Did it come to your mind to look under Addons-transformation?
I guess, had there been a section “Addons-transformation” it would have come to my mind to look under it - but this is what my “Add-ons”-Screen looks like:
Any idea why there is no “transformation”-section?
Do you by chance have simple mode turns on?
Yes, simple mode was turned on - but with it turned off, I still do only see “BINDINGS”, “MISC” and “VOICE” in the add-ons-section
What package did you choose when you first set up openHAB? This is the big icon you selected the very first time you opened the dashboard and you had choices like “Demo”, “Minimal”, “Basic” it the like.
I bet you code one if the “simpler” packages in which case all the transformations were installed automatically for you.
You can bet that I chose one of the simpler packages. To be honest, I do not remember which on I actually chose. And I do not know how to find out if either the JSON-transformation is installed or which package I actually chose in the dashboard.
I came to the comclusion, it might not be installed because I have the same “NaN”-problem like the threadstarter and I did not see the installed package anywhere…
It seems that sometimes it takes a bit more to get that to “stick” - not directly related, but probably worth following this process -
It has been as while, due to a vacation in Creeth, but I managed to get my Sonoff devices flashed with Tasmota…
Now I´m bit stuck on whats next to do…
I suspect I need a MQTT broker. But which one to use (I think I reacall mosquito is build-in openhabian, right?).
Then I need a binding in openhab… but which one to use… When I enter the addons, I see several mqtt binding.
My Sonoff devices is one RF Bridge and one Pow R2. Both are flashed and running Tasmota fine.
Yes, openHABian will install Mosquitto. I don’t think it get’s installed by default so you will want to go through openhabian-config to get it installed. Mosquitto is what most of us use I believe.
If you want a simpler to set up and use broker, OH now comes with Moquette which is an embedded broker you can install from the MISC tab in PaperUI. But this is a very simple broker lacking many of the features and capabilities of Mosquitto.
