A Survey on the Bluetooth 5.0 & 5.1 Standard for the IoT

Bluetooth (BT) is a commonly used wireless communication protocol for many interesting Internet of Things (IoT) projects and real world scenarios. In this survey paper we summarise the current state of research and proceedings on the two latest BT versions 5.0 and 5.1. Including newly added functionality such as improved low-power functions, mesh networking, device localisation and found security vulnerabilities. We also work out the four main research topics, BLE functionality, BT mesh networks, device localisation and security. After that we recognises the used research approaches as prototyping in different environments, measuring and evaluating wireless protocols and security analysis. Based on these insights, we classify the research publications into categories and present some of the representative papers. In conclusion of this paper we gain an overview of the current research in BT technology and its future developments.