Smart city involve large number of interconnected service oriented devices. A research challenge in smart city deployment is aggregation and processing of real-time data. Whereas, the technologies had different format with respect to different sensing applications and processing of this high-level data cloud is still a research focus in smart city domain. In this paper we introduced the smart city framework for handling large-scale IoT data streams and introduced the simulation of hardware as well as software for real-time data representation. We deploy the introduced framework in Integrated Development Environment with a platform of microcontroller for real-time sensor data streaming and processing of sensors data. We also point out the challenges of smart adaptation, user centric cloud based decision support and trustworthy information processing for smart city applications.