The evolution of networking technologies is crucial in the 21st century. The greatest challenge for the Industry 4.0 is the spread and generalization of cyber physical production systems which cannot evolve without new networking technologies. One of these research areas is the wireless mesh networking which may offer an accurate, fast, adaptive, self-organizing, self-healing and inexpensive solution in communication. Wireless mesh networking involves some radio technologies, like Wi-Fi, ZigBee, Bluetooth, IQRF, etc. The most widespread and cost effective solution of the above mentioned ones is Bluetooth. Luckily, Bluetooth SIG adopted the first mesh core stack into Bluetooth 5 protocol in 2017, although a newer Bluetooth 5.1 came out since then. In this paper, the development of Bluetooth mesh core stack will be presented using OmNET++ simulation tool.