IO-Link is a self-certification, meaning the customers themselves guarantee that their products are IO-Link certified. This typically refers to a final system/end product. We do some limited testing on our ICs to prove that they are IO-Link compliant as well. The MAX14819 is actually very well documented in that sense. Unfortunately, Maxim does not handle the firmware or software for IO-Link products, but we do recommend a few companies such as TMG and TE-Concepts.