Network monitoring and GPIO control with SNMP

Pins and Nodes

© Lead Image © Julia Borisenko, 123RF.com

© Lead Image © Julia Borisenko, 123RF.com

Article from Issue 216/2018
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Monitor disk space and network and CPU loads with SNMP, view and control Rasp Pi GPIO pins remotely with custom SNMP objects, and create web dashboards with Node-RED.

Some of the great full-featured networking packages like Nagios [1] and MRTG [2] can be loaded on a Raspberry Pi. If, however, you are looking for something a bit smaller in scale, a Simple Network Management Protocol (SNMP) installation and Node-RED is a great place to start. Node-RED [3] is a visual programming environment that lets you create applications by dragging and dropping blocks (nodes) on the screen and directing the logic flow by connecting the nodes together.

In this article, I look at some basic SNMP monitoring that will allow you to integrate a Raspberry Pi into a larger network (Figure 1).

SNMP

SNMP is the standard for communicating with and monitoring network devices. Common device information is grouped into management information bases (MIBs). Data items are object identifiers (OIDs), referenced by either their MIB name or their OID numeric name. For example, the SNMP device could be queried by its MIB name (e.g., SNMPv2-MIB::sysName.0) or its OID number (e.g., .1.3.6.1.2.1.1.5.0).

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