question

Setup:

1. MultiPlus 48/5000/70-100
2. Cerbo GX
3. CAN bus connected battery
4. 2kW generator for backup charging
5. 1-0-2 switcher for input change (generator/shore)

I have two input modes with unique settings (taken from VE Configure 3):

1. Shore input:
   1. Input Current Limit: 50A
   2. UPS: On
   3. Weak AC: Off
   4. Charge curve: Fixed
2. Generator input:
   1. Input Current Limit: 8A
   2. UPS: Off
   3. Weak AC: On
   4. Charge curve: Adaptive

I need to change these settings on the fly, without a human involvement.

1st option is default obviously.

How it can be done:

1. A user uses 1-0-2 selector switch to use generator.
2. Cerbo GX gets signal generator is ON.
3. On this event, the system changes settings.
4. A user gets back to coffee w/o noticing changes =)

And another case, when "A user uses 1-0-2 selector switch to use shore power".

Questions:

1. Which selector switch shall I use to send a signal to Cerbo (step 1)?
2. Where I can send this signal on Cerbo GX (step 2, assuming it won't be complicated)?
3. How to implement/setup this logic (step 3, most complicated for me)?
   1. How to create a custom trigger on "generator is on" event?
   2. How to define these configuration settings within this trigger?

Bash scripts, python, etc, anything is welcome. :)