NGSI Attribute value

This custom node is a simple node that allows to read or update an attribute value of NGSIv2 entity.

Read attribute value

It allows to read an attribute value of NGSIv2 entity.

Properties

• name: A name for a node instance
• Context Broker: An endpoint of a context broker
• ServicePath: FIWARE Service Path
• Action type: read
• Entity id: Id of an entity containing an attribute to be read value
• Entity type: Type of an entity containing an attribute to be read a value
• Attribute name: Attribute name of an attribute to be read a value
• Skip forwarding: If true, Context Broker skips forwarding to Context Providers

Example

Input

Payload JSON Object

A msg.payload should contain information related to the attribute vale to read.

The following payload uses value of each property.

{}

The following payload overwrites value of each property.

{
  "id": "urn:ngsi-ld:attr-value",
  "type: "T",
  "attrName": "test",
  "skipForwarding": true
}

Output

Payload null, Boolean, Number, String or JSON Object

A msg.payload contains an attribute value.

Update attribute value

It allows to update an attribute value of NGSIv2 entity.

Properties

• name: A name for a node instance
• Context Broker: An endpoint of a context broker
• ServicePath: FIWARE Service Path
• Action type: update
• Entity id: Id of an entity containing an attribute to be updated value
• Entity type: Type of an entity containing an attribute to be updated a value
• Attribute name: Attribute name of an attribute to be updated a value
• Forced update: If true, it triggers matching subscriptions
• Flow control: If true, it enables flow control mechanism

Example

Input

Payload null, Boolean, Number, String or JSON Object

A msg.payload should contain an attribute value.

null

true

123

abc

{
  "abc": 123
}

["abc", 123]

Output

Payload Number or null

A msg.payload contains a status code.

204

null

Use value of actionType in payload

It allows to read or update an attribute value of NGSIv2 entity.

Properties

• name: A name for a node instance
• Context Broker: An endpoint of a context broker
• ServicePath: FIWARE Service Path
• Action type: value of actionType in payload
• Entity id: Id of an entity containing an attribute to be read or updated value
• Entity type: Type of an entity containing an attribute to be read or updated a value
• Attribute name: Attribute name of an attribute to be read or updated a value
• Skip forwarding: If true, Context Broker skips forwarding to Context Providers
• Forced update: If true, it triggers matching subscriptions
• Flow control: If true, it enables flow control mechanism

Examples

Input 1

Payload JSON Object

The following payload overwrites value of each property.

{
  "actionType": "read",
  "id": "urn:ngsi-ld:attr-value",
  "type: "T",
  "attrName": "test",
  "skipForwarding": true
}

Output 1

Payload null, Boolean, Number, String or JSON Object

A msg.payload contains an attribute value.

Input 2

Payload JSON Object

A msg.payload should contain an attribute value with related information. It overwrites value of each property.

{
  "actionType": "update",
  "id": "urn:ngsi-ld:attr-value",
  "type": "T",
  "attrName": "test",
  "value": null
}

{
  "actionType": "update",
  "id": "urn:ngsi-ld:attr-value",
  "type": "T",
  "attrName": "test",
  "value": false
}

{
  "actionType": "update",
  "id": "urn:ngsi-ld:attr-value",
  "type": "T",
  "attrName": "test",
  "value": 123
}

{
  "actionType": "update",
  "id": "urn:ngsi-ld:attr-value",
  "type": "T",
  "attrName": "test",
  "value": "abc"
}

{
  "actionType": "update",
  "id": "urn:ngsi-ld:attr-value",
  "type": "T",
  "attrName": "test",
  "value": {
    "abc": 123
  }
}

{
  "actionType": "update",
  "id": "urn:ngsi-ld:attr-value",
  "type": "T",
  "attrName": "test",
  "value": ["abc", 123]
}

Output 2

Payload Number or null

A msg.payload contains a status code.

204

null