Using IoTIFY can makes life super easy for Cloud-based IoT. Also there are many tools that let you simulate MQTT clients without using any hardware.Finaly Azure and IoT.
I suggest you to see links and attached file in subject.
-MQTT 101 - How to get started with the lightweight IoT protocol - HiveMQ
www.hivemq.com/blog/how-to-get-started-with-mqtt
-Security in RFID and Sensor Networks
https://books.google.dz/books?isbn=1420068407
-Design Recommendations for Intelligent Tutoring System - Volume 5: ...
https://books.google.dz/books?isbn=0997725729
-Software Technologies: 10th International Joint Conference, ICSOFT ...
could you give some suggestions ,which tool will be best while comparing the following tools NS2,simplesoftIoT simulator,netsim in terms of features,advantages,disadvantages of each tools