The internet of things is rapidly becoming a fact of life. There remain, however, various
challenges with respect to the concept of Industry 4.0 before this new reality is fully integrated into the
industrial sector. One such challenge is ensuring security, an essential issue in terms of both management
and operational technology involving the con guration and administration of physical equipment. Another
is integrating equipment from different manufacturers which must be con gured and/or administered with
incompatible protocols. Likewise, remote access to systems must be carried out from a browser in the
web frame. This paper presents a set of tools, available as a cloud-based service, which facilitates access
to the physical equipment located in a business. The access enables the end user to see and/or modify
the con guration and management of data in a secure, controlled, organized and collaborative manner.
In order to unify different protocols, the service makes use of the Modbus TCP/IP (Transmission Control
Protocol/Internet Protocol) protocol, one of the most commonly used by industry in local networks. The
local Modbus communications are encapsulated in the Websocket protocol to make them accessible from
the cloud. The tools proposed in this paper are based on open hardware platforms and free software, and they
permit local and remote sensors and actuators to be fully and easily accessed. Hence, their chief advantage
is that they allow access from any internet connection, via a browser, to the physical equipment located in
an industry by means of user profiles in accordance with the security level set by each individual company.