I was hoping you were having problems charting. That is easy. Everything else is hard...or maybe impossible.
Over the last 24 hours I have spent a lot of time trying to get my data to a CSV file. My problem is very similar to your problem. I have two variables and I want those two variables in the file.... var1, var2 LF.
Frankly, I am not sure it is possible. The messages from the MyVariables block is quite complex. And the data for each variable is in a separate message. I’m not sure it is possible to join the two messages into a single message. This needs to be done before both variables can be put into a CSV file.
It appears that the message structure is complex enough that ST had to creat a chartst node to be able to graph this data.
Here is something that might help. Look at the chart node...the one written by ST. The documentation on it is quite good. They explain the data format it is expecting. That is the format of the data coming from the processing node. Once you understand the format of the data, you might. E able to write a function to transfer the data from a particular message to the correct row of your chart.
What time zone are you in? I am in the US central zone. Would you be up to a few telephone or zoom calls to discuss this. I wonder if we worked together we might be able to accomplish what we both need and learn a lot about nodered at the same time.
One other thing, there are two ways to send data from your device...one way is non intrusive, the other way requires you to modify your code. Here is some information on this mode:
https://wiki.st.com/stm32mcu/wiki/STM32CubeMonitor:How_to_perform_an_acquisition_in_snapshot_mode
I may try this mode to see if it allows me to send multiple variables in the same message.
