SNMP

The SNMP Connector reads data from SNMP manager objects and writes data back to them, forwarding the results to ThingsBoard as device attributes and telemetry.

To enable this connector, add it to the connectors list in tb_gateway.json — see the General Configuration reference.

Connector configuration: snmp.json

The connector reads its settings from a JSON file. Below is a full example with two device entries — the first using built-in converters, the second using a custom converter class:

{
  "devices": [
    {
      "deviceName": "SNMP router",
      "deviceType": "snmp",
      "ip": "snmp.live.gambitcommunications.com",
      "port": 161,
      "pollPeriod": 5000,
      "community": "public",
      "attributes": [
        { "key": "ReceivedFromGet",       "method": "get",       "oid": "1.3.6.1.2.1.1.1.0", "timeout": 6 },
        { "key": "ReceivedFromMultiGet",  "method": "multiget",  "oid": ["1.3.6.1.2.1.1.1.0","1.3.6.1.2.1.1.2.0"], "timeout": 6 },
        { "key": "ReceivedFromGetNext",   "method": "getnext",   "oid": "1.3.6.1.2.1.1.1.0", "timeout": 6 },
        { "key": "ReceivedFromMultiWalk", "method": "multiwalk", "oid": ["1.3.6.1.2.1.1.1.0","1.3.6.0.1.2.1"] },
        { "key": "ReceivedFromBulkWalk",  "method": "bulkwalk",  "oid": ["1.3.6.1.2.1.1.1.0","1.3.6.1.2.1.1.2.0"] },
        {
          "key": "ReceivedFromBulkGet",
          "method": "bulkget",
          "scalarOid":    ["1.3.6.1.2.1.1.1.0","1.3.6.1.2.1.1.2.0"],
          "repeatingOid": ["1.3.6.1.2.1.1.1.0","1.3.6.1.2.1.1.2.0"],
          "maxListSize": 10
        }
      ],
      "telemetry": [
        { "key": "ReceivedFromWalk",  "community": "private", "method": "walk",  "oid": "1.3.6.1.2.1.1.1.0" },
        { "key": "ReceivedFromTable", "method": "table", "oid": "1.3.6.1.2.1.1" }
      ],
      "attributeUpdateRequests": [
        { "attributeFilter": "dataToSet",      "method": "set",      "oid": "1.3.6.1.2.1.1.1.0" },
        { "attributeFilter": "dataToMultiSet", "method": "multiset", "mappings": { "1.2.3": "10", "2.3.4": "${attribute}" } }
      ],
      "serverSideRpcRequests": [
        { "requestFilter": "setData",      "method": "set",      "oid": "1.3.6.1.2.1.1.1.0" },
        { "requestFilter": "multiSetData", "method": "multiset" },
        { "requestFilter": "getData",      "method": "get",      "oid": "1.3.6.1.2.1.1.1.0" },
        { "requestFilter": "runBulkWalk",  "method": "bulkwalk", "oid": ["1.3.6.1.2.1.1.1.0","1.3.6.1.2.1.1.2.0"] }
      ]
    },
    {
      "deviceName": "SNMP router",
      "deviceType": "snmp",
      "ip": "127.0.0.1",
      "pollPeriod": 5000,
      "community": "public",
      "converter": "CustomSNMPConverter",
      "attributes": [
        { "key": "ReceivedFromGetWithCustomConverter", "method": "get", "oid": "1.3.6.1.2.1.1.1.0" }
      ],
      "telemetry": [
        { "key": "ReceivedFromTableWithCustomConverter", "method": "table", "oid": "1.3.6.1.2.1.1.1.0" }
      ]
    }
  ]
}

Section “devices”

An array of device configurations. Each entry represents one SNMP manager device.

Parameter	Default	Description
`deviceName`	`SNMP router`	Device name in ThingsBoard
`deviceType`	`snmp`	Device type in ThingsBoard
`ip`		IP address or hostname of the SNMP manager
`port`	`161`	SNMP port
`pollPeriod`	`5000`	Polling interval in milliseconds
`community`	`public`	Default SNMP community string (`public` or `private`)
`converter`		(Optional) Custom converter class name; omit to use the built-in converter
`attributes`		Array of attribute mappings — see below
`telemetry`		Array of telemetry mappings — see below
`attributeUpdateRequests`		(Optional) Array of attribute-write configurations
`serverSideRpcRequests`		(Optional) Array of RPC-triggered SNMP operation configurations

Sections “attributes” and “telemetry”

Both sections share the same field structure. attributes entries are sent to ThingsBoard as device attributes; telemetry entries are sent as time-series telemetry.

Parameter	Description
`key`	ThingsBoard attribute or telemetry key name
`method`	SNMP operation to use — see Supported methods
`oid`	Manager object identifier (string or array, depending on the method)

Method-specific parameters (e.g. timeout, community, scalarOid) are described in Supported methods.

Section “attributeUpdateRequests”

Configurations in this section are optional. ThingsBoard allows the provision of device attributes and fetches some of them from the device application. You can treat this as a remote configuration for devices. Your devices are able to request shared attributes from ThingsBoard. See user guide for more details.

The “attributeUpdateRequests” configuration allows configuring the format of the corresponding attribute request and response messages.

Parameter	Description
`attributeFilter`	Shared attribute name to subscribe to
`method`	SNMP write method: `set` or `multiset`
`oid`	Object identifier to write to (used with `set`)
`mappings`	OID-to-value map (used with `multiset`); values may reference `${attribute}`

"attributeUpdateRequests": [
  {
    "attributeFilter": "dataToSet",
    "method": "set",
    "oid": "1.3.6.1.2.1.1.1.0"
  },
  {
    "attributeFilter": "dataToMultiSet",
    "method": "multiset",
    "mappings": {
      "1.2.3": "10",
      "2.3.4": "${attribute}"
    }
  }
]

Section “serverSideRpcRequests”

ThingsBoard allows sending RPC commands to the device connected to ThingsBoard directly or via Gateway.

Configuration, provided in this section is used for sending RPC requests from ThingsBoard to the device through the gateway.

Parameter	Description
`requestFilter`	RPC method name to bind
`method`	SNMP operation to perform — see Supported methods
`oid`	Object identifier (string or array, depending on the method)

"serverSideRpcRequests": [
  { "requestFilter": "setData",      "method": "set",      "oid": "1.3.6.1.2.1.1.1.0" },
  { "requestFilter": "multiSetData", "method": "multiset" },
  { "requestFilter": "getData",      "method": "get",      "oid": "1.3.6.1.2.1.1.1.0" },
  {
    "requestFilter": "runBulkWalk",
    "method": "bulkwalk",
    "oid": ["1.3.6.1.2.1.1.1.0","1.3.6.1.2.1.1.2.0"]
  }
]

Supported methods

Method	Operation	Accepts array OID	Extra parameters
`get`	Read a single object	No	`timeout`
`multiget`	Read multiple objects in one request	Yes	`timeout`
`getnext`	Read the next object after the given OID	No	`timeout`
`walk`	Walk the subtree rooted at OID	No	`community`
`multiwalk`	Walk multiple subtrees	Yes	—
`bulkwalk`	Walk multiple subtrees using BULK requests	Yes	—
`table`	Read an SNMP table	No	—
`bulkget`	Read scalars and repeating objects in one BULK request	—	`scalarOid`, `repeatingOid`, `maxListSize`
`set`	Write a value to a single object	No	—
`multiset`	Write values to multiple objects	—	`mappings`

get

Reads a single SNMP object.

Parameter	Description
`oid`	Object identifier to read
`timeout`	Request timeout in seconds

{
  "key": "ReceivedFromGet",
  "method": "get",
  "oid": "1.3.6.1.2.1.1.1.0",
  "timeout": 6
}

multiget

Reads multiple SNMP objects in a single request.

Parameter	Description
`oid`	Array of object identifiers to read
`timeout`	Request timeout in seconds

{
  "key": "ReceivedFromMultiGet",
  "method": "multiget",
  "oid": [
    "1.3.6.1.2.1.1.1.0",
    "1.3.6.1.2.1.1.2.0"
  ],
  "timeout": 6
}

getnext

Reads the next object in the MIB tree after the given OID.

Parameter	Description
`oid`	Starting OID
`timeout`	Request timeout in seconds

{
  "key": "ReceivedFromGetNext",
  "method": "getnext",
  "oid": "1.3.6.1.2.1.1.1.0",
  "timeout": 6
}

walk

Traverses the subtree rooted at the given OID. Accepts an optional community override.

Parameter	Description
`oid`	Root OID for the walk
`community`	(Optional) Community string override for this operation

{
  "key": "ReceivedFromWalk",
  "community": "private",
  "method": "walk",
  "oid": "1.3.6.1.2.1.1.1.0"
}

multiwalk

Traverses multiple subtrees in a single operation.

Parameter	Description
`oid`	Array of root OIDs to walk

{
  "key": "ReceivedFromMultiWalk",
  "method": "multiwalk",
  "oid": [
    "1.3.6.1.2.1.1.1.0",
    "1.3.6.0.1.2.1"
  ]
}

bulkwalk

Walks multiple subtrees using SNMP BULK requests (more efficient than multiwalk for large trees).

Parameter	Description
`oid`	Array of root OIDs to walk

{
  "key": "ReceivedFromBulkWalk",
  "method": "bulkwalk",
  "oid": [
    "1.3.6.1.2.1.1.1.0",
    "1.3.6.1.2.1.1.2.0"
  ]
}

table

Reads a full SNMP table.

Parameter	Description
`oid`	OID of the table root

{
  "key": "ReceivedFromTable",
  "method": "table",
  "oid": "1.3.6.1.2.1.1"
}

bulkget

Reads scalar and repeating objects in a single SNMP BULK request.

Parameter	Description
`scalarOid`	Array of non-repeating (scalar) OIDs
`repeatingOid`	Array of repeating OIDs
`maxListSize`	Maximum number of repetitions to return

{
  "key": "ReceivedFromBulkGet",
  "method": "bulkget",
  "scalarOid": [
    "1.3.6.1.2.1.1.1.0",
    "1.3.6.1.2.1.1.2.0"
  ],
  "repeatingOid": [
    "1.3.6.1.2.1.1.1.0",
    "1.3.6.1.2.1.1.2.0"
  ],
  "maxListSize": 10
}

set

Writes a value to a single SNMP object. Used in attributeUpdateRequests and serverSideRpcRequests.

Parameter	Description
`oid`	Object identifier to write to

{
  "attributeFilter": "dataToSet",
  "method": "set",
  "oid": "1.3.6.1.2.1.1.1.0"
}

multiset

Writes values to multiple SNMP objects in a single operation.

Parameter	Description
`mappings`	Object mapping OIDs to values; values may use `${attribute}` to reference the incoming attribute value

{
  "attributeFilter": "dataToMultiSet",
  "method": "multiset",
  "mappings": {
    "1.2.3": "10",
    "2.3.4": "${attribute}"
  }
}