Sending a SNMP Trap with a Custom Message via Tasker April 30, 2020

This feature is available in Tasker v3.1 and later.

Having the JNIOR send a SNMP Trap is great. The SNMP application offers built-in Traps when the digital inputs and relay outputs change. Tasker takes this further allowing you to send a SNMP Trap as a part of a Task. The value of the Trap can be custom and dynamic based on the message building rules of Tasker.

The first thing we need to do is make sure that SNMP is running. The feature covered in this post is available in SNMP v2.6 and greater. Once we know that SNMP is running we can Create or Open a Tasker Workspace.

To send a SNMP Trap we will need to add the SNMP Trap action to a Task. You can create a new Task for this action or add it to an already existing Task. The action will ask for the SNMP OID (Object Identifier), the message to send and the device to send the Trap to. The device to receive the Trap can be the built-in Trap Host that is defined in the SNMP application or a new one can be defined in the Devices Tab.

Tasker Action dialog box

Upon selecting the SNMP Trap action you will be presented with the following

Send SNMP Trap empty

Here is what it will look like after entering some information

Send SNMP Trap example

Without defining a SNMP Device, the Trap will be sent to the Trap Host that is defined in the SNMP application. You can optionally define a new Trap Host by clicking + Add Device in the Devices Tab.

Tasker Add Device Action

You will be presented with a Dialog asking for a Device Name and the Device Type. Enter any name and select SNMP Device from the Device Type drop down.

Tasker Create New Device dialog

Now you can enter the Trap Host information as shown here.

Device tab in Tasker

Now back in our Task Action we will see this Device as an option.

SNMP Trap Action with Device in Tasker

Save the Workspace in the File menu and your Custom Trap will be able to be sent!

Advanced Usage

You can send a dynamic message. A dynamic message is one that has different data based on our message building rules. Here we will send the current temperature.

SNMP Trap Action Example

A defined Signal could also be used here instead of temp[1].f and a Trigger could be used to cause the Trap to get sent as described in the using signals and triggers post.

By | On April 30, 2020 3:19 pm | No Comments | Categorized in: , , , , ,