  Navantia, one of Europe's largest shipbuilders, is creating a fog
computing-based Industrial Cyber-Physical System (ICPS) for remote monitoring
in real-time of their pipe workshops. Such a monitoring process, which involves
pipe traceability and tracking, is a unique industrial challenge, given their
metallic content, massive quantity and heterogeneous typology, as well as to
the number of complex processes involved. Pipe improved location, from
production and through their lifetime, can provide significant productivity and
safety benefits to shipyards and foster innovative applications in process
planning. Bluetooth 5 represents a cost-effective opportunity to cope with this
harsh environment, since it has been significantly enhanced in terms of low
power consumption, range, speed and broadcasting capacity. Thus, this article
proposes a Bluetooth 5 fog computing-based ICPS architecture that is designed
to support physically-distributed and low-latency Industry 4.0 applications
that off-load network traffic and computational resource consumption from the
cloud. In order to validate the proposed ICPS design, one of Navantia's pipe
workshops has been modeled through an in-house-developed 3D ray launching radio
planning simulator that considers three main intrinsic characteristics: the
number of pipes, the main working areas with their corresponding machines, and
the daily workforce. The radio propagation results obtained by the simulation
tool are validated through empirical measurements. These results aim to provide
guidelines for ICPS developers, network operators and planners to investigate
further complex industrial deployments based on Bluetooth 5.
