Expressif is the variable substitution syntax combined with a library of predicates and functions. Initially designed for NBi.io, Expressif allows you to define variables, transformations of these variables (with expressions and functions), in plain text, which can then be interpreted by the engine. Same can be done with predicates.
A new set of functions to provide information about the hosting device/system.
hostname: returns the hostname.os: returns the operating-system name.os-version: returns the operating-system version.expressif-version: returns the Expressif library version.