Implementations

in theory: just plain browser requests - but leads to empty page

intro into JSON

plain JS/Ajax: examples by SB

web assembly by Oliver Waits

QSYS: Avolites Code Template

there is a section with some demo files on the Avolites website

there is an example implementation at https://www.avolites.de/support-downloads/web-api-demo#english

another example implementation by Olie Waits: https://github.com/owaits/avolites-webcomponents