The wait is nearly over: on Sep 19 Sim Racing Telemetry we'll add support for Assetto Corsa Competizione (by Kunos Simulazioni)!
The update will be available on all the supported platforms of SRT, but only the PC version of ACC shares telemetry data. If you use Sim Racing Telemetry on a mobile device or macOS, you'll need to use the free PC version of SRT to forward data to your remote device.
When the update will be available, we'll provide more details and updated documentation to record telemetry data from ACC.
In the mean time, wishlist the DLC to be notified by Steam when the update with Assetto Corsa Competizione will be available:
https://store.steampowered.com/app/2133690