INTRODUCTION

The Future Internet enables us to have immediate access to the information of the physical world and its objects. As such, Internet of Things (IoT) has been adopted to incorporate the digital information and the real world of devices. The things we use can connect to the Internet, for instance, watches, TVs, vehicles, machines and more. The accelerated growth of IoT industry requires robust IoT platforms which address the renewal requirements such as in the smart cities applications, an enormous amount of data has to be handled. Internet of Things can be presented as a network of surrounding things which are connecting to the Internet such as various sensors, vehicles, devices which can be monitored, detected, controlled. The things are embedded with the sensors to sense the environment and communicate with other things [1]. The environment is monitored and the things can sense, to be identified uniquely, and to perform any predefined action. Users can access the things through the internet and get notified and take action to control the environment. IoT platforms provide various capabilities in the industry, Emerging industrial IoT and the fourth industrial revolution (Industry 4.0) provides the flexibility for the planners and implementers and leads to better decision-making. Moreover, the machine monitoring and the cloud services in addition to provided applications contribute to growth and production. Finding an appropriate IoT platform for a given field of application is a challenge any company is facing when wanting to select the appropriate platform from the mess of different IoT platforms. Although the functionality provided by IoT platforms is similar or even equal, their implementation and the underlying technologies are different. Sometimes, platform selection process is done without a detailed analysis of requirements [2]. Current IoT platforms have a market share and offer for the customers some competitive advantages and features to make them select it and encourage their choice. It provides several services and applications such as data acquisition and analytics, device management, integration, security, insight to users on the operations and ability to identify and manage devices. There are different IoT models such as on-premise model which is operated on the same premises or organizations and platform as a service which is off-premises and uses cloud computing typically. The companies often select based on these models. The rest of the paper is organised as follows. Section II introduces Comprehension of IoT Platform Parts. Section III discusses IoT Communication Protocols and the primary purpose for using IoT protocols. Next, we list the leading roles of IoT platforms in Section IV. Section V provides hints on choosing the platform for particular needs. In Section VI, we present the results of our survey on a selection of IoT Platforms for large IoT applications. The survey ends with concluding remarks on the proposed use of IoT platforms in Section VII.