The most popular protocols for machine-tomachine (M2M) technology — the backbone of the internet of things (IoT) and industrial internet of things (IIoT) — are affected by security and privacy issues that impact several market verticals, applications, products, and brands.

https://documents.trendmicro.com/assets/white_papers/wp-the-fragility-of-industrial-IoTs-data-backbone.pdf?v1