Synse SNMP Plugin - Deprecated

An SNMP plugin for Synse Server.

Note: Deprecated as of Sept 2023 current working image is at vaporio/snmp-plugin@2.2.5

While there are plans to make this plugin more general-purposed in the future, it is currently limited in scope for what it supports. See the Supported MIBs section below.

Getting Started

Getting

You can install the SNMP plugin via a release binary or via Docker image

docker pull vaporio/snmp-plugin

If you wish to use a development build, fork and clone the repo and build the plugin from source.

Running

The SNMP plugin requires the SNMP-enabled servers it will communicate with to be configured. As such, running the plugin without additional configuration will cause it to fail. As an example of how to configure and get started with running the SNMP plugin, a simple example deployment exists which runs runs Synse Server, the SNMP plugin, and a basic SNMP simulator.

To run it:

docker-compose up -d

You can then use Synse's HTTP API or the Synse CLI to query Synse for plugin data.

SNMP Plugin Configuration

Plugin and device configuration are described in detail in the Synse SDK Documentation.

When deploying, you will need to provide your own plugin configuration (config.yaml) with dynamic configuration defined. This is how the SNMP plugin knows about which servers to communicate with. Dynamic configuration generates the devices at plugin startup from the results of a MIB walk, so there is no need to specify device instance configuration for the plugin.

As an example:

dynamicRegistration:
  config:
  - model: PXGMS UPS + EATON 93PM
    version: v3
    endpoint: 127.0.0.1
    port: 1024
    userName: simulator
    authenticationProtocol: SHA
    authenticationPassphrase: auctoritas
    privacyProtocol: AES
    privacyPassphrase: privatus
    contextName: public

Dynamic Registration Options

Below are the fields that are expected in each of the dynamic registration items. If no default is specified (-), the field is required.

Field	Description	Default
model	The model of the UPS. (Currently only supports models starting with "PXGMS UPS")	-
version	The SNMP protocol version. (Currently only "v3" is supported)	-
endpoint	The endpoint of the SNMP server to connect to.	-
port	The UDP port to connect to.	-
userName	The SNMP username.	-
authenticationProtocol	The SNMP authentication protocol. (Supported: MD5, SHA)	-
authenticationPassphrase	The passphrase for authentication.	-
privacyProtocol	The SNMP privacy protocol. (Supported: AES, DES)	-
privacyPassphrase	The passphrase for privacy.	-
contextName	The context name for SNMP v3 messages.	-

Reading Outputs

Outputs are referenced by name. A single device may have more than one instance of an output type. A value of - in the table below indicates that there is no value set for that field. The custom section describes outputs which this plugin defines while the built-in section describes outputs this plugin uses which are built-in to the SDK.

Custom

Name	Description	Unit	Type	Precision
volt-ampere	A measure of power, in volt-amperes.	VA	power	3
identity	An output for SNMP identifiers.	-	-	-

Built-in

Name	Description	Unit	Type	Precision
electric-current	A measure of current, in amperes.	A	current	3
frequency	A measure of frequency, in hertz.	Hz	frequency	2
watt	A measure of power, in watts.	W	watt	3
status	A general measure of status.	-	-	-

Device Handlers

Device Handlers are referenced by name.

Name	Description	Outputs	Read	Write	Bulk Read	Listen
current	A handler for OIDs which report current.	electric-current	✓	✗	✗	✗
frequency	A handler for OIDs which report frequency.	frequency	✓	✗	✗	✗
identity	A handler for OIDs which report SNMP identity.	identity	✓	✗	✗	✗
power	A handler for OIDs which report power.	watt	✓	✗	✗	✗
status	A handler for OIDs which report status.	status	✓	✗	✗	✗
percentage	A handler for OIDs which report percentage.	percentage	✓	✗	✗	✗
minutes	A handler for OIDs which report minutes.	minutes	✓	✗	✗	✗
seconds	A handler for OIDs which report seconds.	seconds	✓	✗	✗	✗

Write Values

The SNMP plugin does not currently support writing to any of its device handlers.

Supported MIBs

• UPS-MIB

Compatibility

Below is a table describing the compatibility of plugin versions with Synse platform versions.

	Synse v2	Synse v3
plugin v1.x	✓	✗
plugin v2.x	✗	✓

Troubleshooting

Debugging

The plugin can be run in debug mode for additional logging. This is done by:

• Setting the debug option to true in the plugin configuration YAML

  debug: true

• Passing the --debug flag when running the binary/image

  docker run vaporio/snmp-plugin --debug
  

• Running the image with the PLUGIN_DEBUG environment variable set to true

  docker run -e PLUGIN_DEBUG=true vaporio/snmp-plugin
  

Developing

A development/debug Dockerfile is provided in the project repository to enable building image which may be useful when developing or debugging a plugin. Unlike the slim scratch-based production image, the development image uses an ubuntu base, bringing with it all the standard command line tools one would expect. To build a development image:

make docker-dev

The built image will be tagged using the format dev-{COMMIT}, where COMMIT is the short commit for the repository at the time. This image is not published as part of the CI pipeline, but those with access to the Docker Hub repo may publish manually.

Contributing / Reporting

If you experience a bug, would like to ask a question, or request a feature, open a new issue and provide as much context as possible. All contributions, questions, and feedback are welcomed and appreciated.

License

The Synse SNMP Plugin is licensed under GPLv3. See LICENSE for more info.