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Node.js SDK Manual

October 21, 2024

Environment

  • IDE

    • VS Code

  • Runtime

    • Node 6 or above

  • Installation

    npm install edgesync360-edgehub-edge-nodejs-sdk

EdgeAgent

Constructor(EdgeAgentOptions options)​

New EdgeAgent object

const edgeSDK = require("edgesync360-edgehub-edge-nodejs-sdk");

let options = {
  connectType: edgeSDK.constant.connectType.DCCS,
  DCCS: {
    // If ConnectType is DCCS, the following options must be entered
    credentialKey: "",
    APIUrl: "",
  },
  MQTT: {
    // If ConnectType is MQTT, the following options must be entered
    hostName: "127.0.0.1",
    port: 1883,
    username: "admin",
    password: "admin",
    protocolType: edgeSDK.constant.protocol.TCP,
  },
  AzureIotHub: {
    hostName: "",
    sasToken: "",
  },
  useSecure: false,
  autoReconnect: true,
  reconnectInterval: 1000,
  nodeId: "6579dba6-9d19-44a2-b645-c2319c8f1315", // getting from datahub portal
  type: edgeSDK.constant.edgeType.Gateway, // Configure the edge as a Gateway or Device. The default setting is Gateway.
  deviceId: "Device1", // If the type is Device, the DeviceID must be input.
  heartbeat: 60000, // The default is 60 seconds.
  dataRecover: true, // Whether to recover data when disconnected
  ovpnPath: "", // Set the path of the .ovpn file.
};
let edgeAgent = new edgeSDK.EdgeAgent(options);

Azure IoT Hub​

Due to the connection limit of the Azure IoT Hub SDK, the C# SDK can only connect to the Azure IoT Hub using a SASToken. Therefore, you can only connect to the Edge Hub using a SCADA device.

Event​

EdgeAgent has three subscription events.

  • Connected: When EdgeAgent is connected to the IoTHub.
  • Disconnected: When EdgeAgent is disconnected from the IoTHub.
  • Message Received: When EdgeAgent receives an MQTT message from the cloud. The message types are as follows:
    • WriteValue: Change the tag value from the cloud.
    • ConfigAck: Response to config uploads from the edge to the cloud.
edgeAgent.events.on('connected', () => {
  console.log('Connection success!');
});
edgeAgent.events.on('disconnected', () => {
  console.log('Disconnected...');
});
edgeAgent.events.on('messageReceived', (msg) => {
  switch (msg.type) {
    case edgeSDK.constant.messageType.writeValue:
      for (let device of msg.message.deviceList) {
        console.log('DeviceID:' + device.ID);
        for (let tag of device.tagList) {
            console.log('TagName:' + tag.name + , 'Value:' + tag.value);
        }
      }
      break;
    case edgeSDK.constant.messageType.configAck:
      console.log('Upload Config Result:' + msg.message);
      break;
  }
});

Connect([callback])​

Connect to the IoTHub. When successfully connected, a connected event will be triggered.

edgeAgent.connect();
  • Promise example
edgeAgent.connect().then(
  (result) => {
    // If connected successfully, result return true, and vice versa.
    // Do something...
  },
  (error) => {
    // If connection is unsuccessful, return an error object containing an error message.
    // Do something...
  },
);
  • Callback example
edgeAgent.connect((error, result) => {
  // If connected successfully without error, error return null, result return true, and vice versa.
  // Do something...
});

Disconnect([callback])​

Disconnect from the IoTHub. When successfully disconnected, a disconnected event will be triggered.

edgeAgent.disconnect();
  • Promise example
edgeAgent.disconnect().then(
  (result) => {
    // If disconnected successfully, result return true, and vice versa.
    // Do something...
  },
  (error) => {
    // If disconnection is unsuccessful, return an error object containing an error message.
    // Do something...
  },
);
  • Callback example
edgeAgent.disconnect((error, result) => {
  // If disconnected successfully without error, error return null, result return true, and vice versa.
  // Do something...
});

uploadConfig(action, edgeConfig, [callback])​

Upload Node/Device/Tag Config with Action Type (Create/Update/Delete).

  • Promise example
let edgeConfig = new edgeSDK.EdgeConfig();
// set node config
// set device config
// set tag config

edgeAgent.uploadConfig(edgeSDK.constant.actionType.create, edgeConfig).then(
  (result) => {
    //If uploaded successfully, result return true, and vice versa.
  },
  (error) => {
    //If config uploaded unsuccessfully, return an error object containing an error message.
  },
);
  • Callback example
let edgeConfig = new edgeSDK.EdgeConfig();
// set node config
// set device config
// set tag config

edgeAgent.uploadConfig(
  edgeSDK.constant.actionType.create,
  edgeConfig,
  (error, result) => {
    //If uploaded successfully without error, error return null, result return true, and vice versa.
    //Do something...
  },
);

Node Config:

let nodeConfig = new edgeSDK.NodeConfig();
edgeConfig.node = nodeConfig;

Device Config:

let deviceConfig = new edgeSDK.DeviceConfig();

// The required properties are as follows:
deviceConfig.ID = "Device1";
deviceConfig.name = "Device 1";
deviceConfig.type = "Smart Device";

// The optional properties are as follows:
deviceConfig.description = "Device 1";

If the optional properties are not required, skip the properties configuration.

Analog Tag Config:

let analogTagConfig = new edgeSDK.AnalogTagConfig();
analogTagConfig.name = "ATag1";
analogTagConfig.description = "ATag1";
analogTagConfig.readOnly = false;
analogTagConfig.arraySize = 0;
analogTagConfig.spanHigh = 1000;
analogTagConfig.spanLow = 0;
analogTagConfig.engineerUnit = "";
analogTagConfig.integerDisplayFormat = 4;
analogTagConfig.fractionDisplayFormat = 2;

deviceConfig.analogTagList.push(analogTagConfig);

Discrete Tag Config:

let discreteTagConfig = new edgeSDK.DiscreteTagConfig();
discreteTagConfig.name = "DTag1";
discreteTagConfig.description = "DTag1";
discreteTagConfig.arraySize = 0;
discreteTagConfig.state0 = "0";
discreteTagConfig.state1 = "1";
//discreteTagConfig.state2 = '';
//discreteTagConfig.state3 = '';
//discreteTagConfig.state4 = '';
//discreteTagConfig.state5 = '';
//discreteTagConfig.state6 = '';
//discreteTagConfig.state7 = '';

deviceConfig.discreteTagList.push(discreteTagConfig);

Text Tag Config:

let textTagConfig = new edgeSDK.TextTagConfig();
textTagConfig.name = "TTag1";
textTagConfig.description = "TTag1";
textTagConfig.readyOnly = false;
textTagConfig.arraySize = 0;

deviceConfig.textTagList.push(textTagConfig);

BlockConfig​

Create block config:

let analogTagConfig = new edgeSDK.AnalogTagConfig();
analogTagConfig.name = "ATag1";
analogTagConfig.description = "ATag1";
analogTagConfig.readOnly = false;
analogTagConfig.arraySize = 0;
analogTagConfig.spanHigh = 1000;
analogTagConfig.spanLow = 0;
analogTagConfig.engineerUnit = "";
analogTagConfig.integerDisplayFormat = 4;
analogTagConfig.fractionDisplayFormat = 2;

let discreteTagConfig = new edgeSDK.DiscreteTagConfig();
discreteTagConfig.name = "DTag1";
discreteTagConfig.description = "DTag1";
discreteTagConfig.arraySize = 0;
discreteTagConfig.state0 = "0";
discreteTagConfig.state1 = "1";

let textTagConfig = new edgeSDK.TextTagConfig();
textTagConfig.name = "TTag1";
textTagConfig.description = "TTag1";
textTagConfig.readyOnly = false;
textTagConfig.arraySize = 0;

let blockConfig = new edgeSDK.BlockConfig();
blockConfig.blockType = "Pump";
blockConfig.analogTagList.push(analogTagConfig);
blockConfig.discreteTagList.push(discreteTagConfig);
blockConfig.textTagList.push(textTagConfig);

This block config contain 3 tag, and the block type is Pump, using this block config create two block:

deviceConfig.addBlock("Pump01", blockConfig);
deviceConfig.addBlock("Pump02", blockConfig);

This will add 6 tag to your device, the first 3 tag will have a prefix of Pump01 and the last 3 tag will have a prefix of Pump02, for example:

sendData(data, callback)​

Send the tag value to the cloud.

let data = new edgeSDK.EdgeData();

for (let i = 1; i  {
    // If data sending is successful, result return true, and vice versa.
  },
  (error) => {
    // If data sending is unsuccessful, return an error object containing an error message.
  },
);
  • Callback example
edgeAgent.sendData(data, (error, result) {
  //If data sending is successful without error, error return null, result return true, and vice versa.
  //Do something...
});

Send the array tag value to the cloud.

let data = new edgeSDK.EdgeData();

// analog array tag
let AryTag = new edgeSDK.EdgeDataTag();
AryTag.deviceID = "Device1";
AryTag.tagName = "ArrayAnalogTag1";
AryTag.value = {
  0: 0.5,
  1: 1.42,
  2: 2.89,
};
data.tagList.push(AryTag);

// discrete array tag
let AryTag = new edgeSDK.EdgeDataTag();
AryTag.deviceID = "Device1";
AryTag.tagName = "ArrayDiscreteTag1";
AryTag.value = {
  0: 0,
  1: 1,
  2: 2,
};
data.tagList.push(AryTag);

// text array tag
let AryTag = new edgeSDK.EdgeDataTag();
AryTag.deviceID = "Device1";
AryTag.tagName = "ArrayTextTag1";
AryTag.value = {
  0: "zero",
  1: "one",
  2: "two",
};
data.tagList.push(AryTag);

sendDeviceStatus(deviceStatus, [callback])​

Send the device status to the cloud when the status is changed.

  • Promise example
let deviceStatus = new edgeSDK.EdgeDeviceStatus();

for (let i = 1; i  {
    //If device status sending is successful, result return true, and vice versa.
  },
  (error) => {
    //If device status sending is unsuccessful, return an error object containing an error message.
  },
);
  • Callback example
let deviceStatus = new edgeSDK.EdgeDeviceStatus();

for (let i = 1; i <= 2; i++) {
  let device = new edgeSDK.DeviceStatus();
  device.ID = &#39;Device&#39; + i;
  device.status = 1;	// offline = 0, online = 1
  deviceStatus.deviceList.push(device);
}

edgeAgent.sendDeviceStatus(deviceStatus, (error, result) {
  //If device status sending is successful, error return null, result return true, and vice versa.
});

Sample Code

Release Note

  • [1.0.2] - 2024-10-21
    • Add
      • Support Azure IoT Hub device connection which is created from EdgeHub
  • [1.0.1] - 2024-09-09
    • Add
      • Support BlockType that is defined in WISE-PaaS MQTT v1.0.16
  • [1.0.0] - 2024-08-08
    • Add
      • EdgeSync360 EdgeHub EdgeSDK Project initialized, derived from WISE-PaaS DataHub EdgeSDK

Release Note (Archived: WISE-PaaS DataHub EdgeSDK)

  • [1.0.6] - 2021-08-06
    • Fixed
      • Fixed the problem of redundant connection when SDK reconnect.
  • [1.0.5] - 2021-03-08
    • Fixed
      • Fixed the issue that automatically reconnected after disconnecting actively
  • [1.0.4] - 2020-11-25
    • Fixed
      • Fix the problem of connection with SSL
  • [1.0.3] - 2020-05-18
    • Added
      • Support OpenVPN in Linux
      • Support “Delsert” action of UploadConfig
  • [1.0.2] - 2020-03-05
    • Added
      • Add data type checking mechanism of the sendData function
      • Automatic rounding down of the tag value by “FractionDisplayFormat”
      • Retain the last config upload for internal data processing
  • [1.0.1] - 2020-01-21

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