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In this study, LabVIEW environment was used to practically interface various sensors in the smart home to a subagent computer from which these sensors reading are transmitted to a master agent computer called the coordinator (control computer). Remote access to the coordinator was made through various protocols such as Simple Network Management Protocol (SNMP) via Internet.
Smart home or Smart building (which is a part of IoT) is a term used to define the living space that has automated appliances, air conditioning, fire sensor, TV, lighting, security and camera systems that has the ability to communicate between each other. These devices can be monitored and controlled from any room in the smart home, as well as remotely from any location in the world via Internet using smart phone or computer. In order to enhance the monitoring and controlling of smart home devices, the study used Simple Network Management Protocol (SNMP) with wireless sensor network (WSN), which is show high efficiency in reducing the traffic load.
The following figure shows a representation of the practical implementation of a test bed consisting of a temperature sensor, gas sensor and ethanol sensor, these sensors connected to a WLAN host via a data acquisition board NI Elvis II. This WLAN host (called sub agent) is used to send the sensors’ readings to another WLAN host (called master agent) using LabVIEW over TCP connection. Then SNMP has been used over the Internet to a remote computer (or smart Phone) called (NMS) to make the home system more robust and secure.
Many sensors readings transmitting approaches have been adopted (from Sub Agent to Master Agent). A new proposed one enabled the transmitting of such reading as soon as it changed, or when the network administrator issues a manual get for any of them. Nevertheless, the readings has been transmitted in a predefined time intervals to update these sensors readings. In addition, the reading can be transmit to the master agent in real time without any limitation of sensor reading.
The use of SNMP showed high efficiency in reducing the traffic load. A corner stone in applying SNMP is the design of a database file (MIB) as repository for sensor reading with their time stamps and other properties. The above transmitting approaches have been also adopted using various SNMP Get commands. The Set command is used to update the interval between two successive transmitting operations.
Mohammed Basheer Al-Somaidai, Electrical Engineering Dept., College of Eng., University of Mosul, Mosul, Iraq.
Omar Mowaffak Ahmad Alsaydia, Computer and Information Department, Ninevah University, Mosul, Iraq.