The Excentis basic package provides various utilities and helper functions to ease Tcl development, both in general and specifically for ByteBlower. It provides such things as data conversions, unit conversions, byte frame generation, checksum calculation, address validation, etc.
While most of the functions were implemented to make developing against the ByteBlower API easier, none of them depend explicitly on ByteBlower software. Therefore, they can be used in other projects as well.
The source code of the support functions is freely available to the user. So if you have any questions about their internals or want to use the implementation as a basis for your own Tcl framework, you can find the source in your install directory! It is also available in this documentation.