Besides requesting data, can you also change settings on the Globallink 520?
Do you mean remotely changing system device settings, or locally changing the 520 settings?
Locally, you can change the 520 settings with Victron connect via Bluetooth, although not all Android devices work. My Pixel 6 doesn’t work, but an iPhone, a very old Samsung or Spectralink Versity work just fine.
Remotely, you can change the auto update, relay 1 state and Bluetooth settings of the 520 only. It is not possible to remotely change any other system device settings.