Performance of SNMP Protocol in Sensor Network Measurement and IoT Web-based HMI Features

The Simple Network Management Protocol (SNMP) is a networking protocol used for the management and monitoring of all connected devices in internet standard protocol networks. Recently, the utilization and capability of SNMP has been enhanced to be able to handle data exchange across a network from the control level to the human machine interface level. Some controllers, including micro-controllers, have upgraded their features and coverage to include SNMP in their communications protocol. The utilization of SNMP is also supported by Open Platform Communications (OPC) Server, which plays an important role as data exchange server for various controllers or systems with different gateways and drivers. This paper presents the performance assessment of SNMP implementation in a network, from controller to OPC server, comparing hardwired and wireless automation architectures. The results show that in both cases the round-trip times (RTT) of SNMP were acceptable according to network criteria, with an average of less than 100 ms. Hence, SNMP is suitable as an industrial automation protocol.