**6. Conclusions**

In this work, we have proposed a LoRaWAN compliant reliable and low-latency solution to fulfil the requirements of a FMAR scenario. To this aim, a low-cost and lowpower wearable device was developed to detect the leakage of hazardous and flammable gases. The proposed approach allows to reliably transmit urgen<sup>t</sup> data to the central server. This goal is achieved by leveraging the transmission of DL control messages aimed at avoiding collisions among concurrent transmissions. Finally, we validated the proposed approach with extensive experimental tests in an industrial-like scenario. Numerical results sugges<sup>t</sup> that LoRaWAN can be exploited to obtain the required level of reliability in the considered scenario.

**Author Contributions:** Conceptualization, A.A.; methodology, D.T., A.P., L.P., A.F. and A.A.; software, D.T. and L.P.; validation, D.T., A.P., L.P., A.F. and A.A.; formal analysis, A.A.; investigation, D.T.; resources, D.T.; data curation, A.A. and A.F.; writing—original draft preparation, D.T.; writing— review and editing, D.T., A.P., L.P. and A.A.; visualization, D.T. and A.A.; supervision, A.A.; project administration, A.F. and A.A.; funding acquisition, A.A. All authors have read and agreed to the published version of the manuscript.

**Funding:** This work has been supported by INAIL, the Italian National Institute for Insurance against Accidents at Work, within the framework of the CP-SEC project: Cyber-Physical system (CPS) for the safety of factories at major accident risk.

**Institutional Review Board Statement:** Not applicable.

**Informed Consent Statement:** Not applicable.

**Data Availability Statement:** Not applicable.

**Conflicts of Interest:** The authors declare no conflict of interest.
