Switching a relay on an MPPT charge controller using Node-Red on RPi

DIY
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Not on a Rpi but on a Cerbo GX here, trying to set the Relay of an SmartSolar MPPT 100/20 to OFF

I am trying multiple things, using the Custom Control Node
(also trying to set the mode to 2=remote via a custom control node)

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I also tried using exec node. Using command ‘vreg’ and extra input parameters: ‘-c socketcan:can0 -s 0xEDAB un8:1 -n 0x280’ but without success.

Did anybody got it every working to remotely set the relay of a SmartSolar MPPT 75/10, 75/15, 100/15 or 100/20.
I can set it via the VictronConnect APP with bluetooth, so why not via remote commands?

Kind regards,

Roel Broersma