Dear Roberto Omar Andrade,

the answer to your question is very complex. Some ideas (in figures) in this chapter will help you:

Network Security Planning - What needs to be done during network planning to ensure network security as much as possible?

https://www.researchgate.net/publication/340511097

This source also provides help:

NISTIR 8200: Interagency Report on the Status of International Cybersecurity Standardization for the Internet of Things (IoT)

https://doi.org/10.6028/NIST.IR.8200

Look here:

7 IoT Cybersecurity Objectives, Risks, and Threats

8 Standards Landscape for IoT Cybersecurity

Best regards and much success

Anatol Badach

Dear Roberto Omar Andrade , here are some cases for IoT devices security risk assessment :

https://www.tripwire.com/state-of-security/security-data-protection/iot/iot-devices-risk-assessment-critical/

You can also see in the article below some new methodologies to assess risk in this context:

https://www.cs.ox.ac.uk/files/9680/2017-itpro-ncd_author-final.pdf

Thanks for your contributions.

each potential math model of LoT should match a dual-logical decision, DO or Not DO, which is the biggest risk. I think.