Use external Javascript functions to generate the telemetry for simulated devices. The path of folder that contain the Javascript files can be configured, so it's possible to mount JS files from anywhere. Files are loaded at runtime. The name of the files is specified in the Device Type JSON files, which are managed in the same way, with a configurable path and loaded at runtime.
Javascript files are interpreted using Jint https://github.com/sebastienros/jint .
Documentation here: https://github.com/Azure/device-simulation-dotnet/wiki/Device-Types
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