## 1 Introduction  
Industrial manufacturing interfaces with the introduction of 5G networks in production. The realization of smart manufacturing is now possible thanks to the unique features of the new-generation network technology: low latency, extremely high reliability, scalability, and predictability. These features allow for real-time control of machinery and devices on factory shop floors. Sensors are directly integrated into them and can send a large amount of data in a short time, achieving the Industry 4.0 objectives. From a telecommunication point of view, great strides have been made in new network technology. The goal is to provide new 5G-enabled sensors that can be used for production purposes.  
In state-of-the-art, industrial sensors still have significant limitations. The connections are still based on cables, limiting their flexibility. Wireless solutions are already present, e.g., Wi-Fi(r) or Bluetooth(r), but cannot meet the strict specifications of latency and reliability. The solution proposed in this paper is a multi-sensor platform (MSP). The prototype consists of a modular system for monitoring workpieces and machinery of the shop floor in a factory.  
At the industrial production level, there are already sensor platforms, but requirements such as latency, reliability, and versatility are not met. Several papers have been published presenting MSP solutions. In [1], the XDK sensor from Bosch is described; Ref. [2] describes the EU project for MSP for smart building management solutions. A Zigbee-enabled wireless sensor platform is described in [3], which is limited by data rate and range; Ref. [4]describes the prototype of a wireless hosting sensors device for water monitoring. Other wireless sensor platforms discussed [5; 6] use Bluetooth or Wi-Fi to transfer process data from sensors. These wireless standards are limited by latency, range, and throughput, which, for many industrial applications, are of high priority. The new 5G standard meets the requirements of versatility and latency and enables the use of wireless sensors for industrial monitoring applications. \"Meeting the Requirements of Industrial Production with a Versatile Multi-Sensor Platform Based on 5G Communication\" [7] describes the design of an MSP with 5G to meet the industrial standard. The paper explains the steps to realize an industrial-grade sensor platform and describes the technical architecture in depth. It includes the hardware used, the software to realize the real-time data acquisition and data transmission with the 5G. The proposed MSP integrates various types of sensors, both internal and external, to send data in real time to the factory cloud [8].  
The MSP is designed as part of the European Horizon 2020 project 5G-SMART. The project's objective is to demonstrate, evaluate and validate 5G in industrial processes and identify valuable business models. The main applications are robotics, automation production, and smart manufacturing [9]. The three main sites where prototypes and new technologies are tested are: Fraunhofer IPT in Aachen, which represents a shop floor with machining centers; Ericsson Smart Factory in Kista, where the factory of the future is being planned; and the Bosch Semiconductor Factory in Reutlingen, where a real-world semiconductor factory is tested [10].  
With this paper, we aim to describe the main activities behind the realization of the MSP prototype. Section 2 reports the materials and methods used. Layout and use cases of the MSP within the Aachen trial site are provided in Section 3. Section 4 describes the hardware design of the MSP, analyzing the elements of the system architecture. From the hardware components, a basic library for the final firmware is presented in Section 5. Section 6 describes the MSP software architecture. Conclusions and future research are given in Section 7.