Get Push Messages by Pulsar (Node.js SDK)

A cloud project provides the message subscription feature. If the device status in the project changes, such as registration, data reporting, and offline events, Message Service is used to actively push event data to external partners with Pulsar. This helps to implement real-time and persistent messages.

Prerequisites

• You have created a project. For more information about project creation, see Quick Start.

Procedure

Currently, Tuya Smart Message Service is customized and modified based on open source Pulsar. The Pulsar SDK for Node.js is provided.
In this topic, the Node.js development tool WebStorm is used to receive messages.

Step 1: Download the demo source code

Click Pulsar SDK to download the package to the local computer and decompress the package.

Step 2: Set up the test environment

1. Use WebStorm to open the source code project: Click Open to find the downloaded and decompressed file in the previous step.

   

2. Add a dependency environment.

   • crypto-js: 4.0.0 or later

   • ws: 7.4.5 or later

     

Step 3: Configure project parameters

Modify the parameters in the example/index.js file. This topic takes the test channel as an example.

const client = new TuyaWebsocket({
  accessId: "xt*****ff**n1****8ufo",
  accessKey: "479bcb7345******582d9c******4ef7",
  url: TuyaWebsocket.URL.CN,
  env: TuyaWebsocket.env.TEST, // Test channel
  maxRetryTimes: 50,
});

The parameters are described as follows.

• accessId: Enter the value of Access ID in the Authorization Key section on the Tuya IoT Development Platform.

• accessKey: Enter the value of Access Secret in the Authorization Key section on the Tuya IoT Development Platform.

• url: For more information about the parameters, see src/config.ts. Be sure to use the URL of the specified domain name where the private cloud is deployed.

• env: the message subscription channel.

  • TuyaWebsocket.env.PROD: the production environment.
  • TuyaWebsocket.env.TEST: the test environment.

• maxRetryTimes: the maximum number of reconnections.

  TEST in env represents the test environment and PROD represents the production environment.

  

Step 4: Operate a device on the app and receive messages in the test environment

1. The messages reported by the test device will be sent through the test channel to accelerate debugging of device functions.

2. On the development tool WebStorm, open the Terminal and run the yarn code.

   1. yarn

   2. yarn example

   3. Execution result:

      even@MacBook-Air message-subscription-websocket-master % yarn
      yarn install v1.22.11
      [1/4] 🔍  Resolving packages...
      success Already up-to-date.
      $ husky install
      husky - not a Git repository, skipping hooks installation
      ✨  Done in 1.32s.
      even@MacBook-Air message-subscription-websocket-master % yarn example
      yarn run v1.22.11
      $ npm run build && node ./example/index.js
      npm WARN lifecycle The node binary used for scripts is /var/folders/jf/_0x1y81n67x979xf09m_cv580000gn/T/yarn--1630917003536-0.5926954827118307/node but npm is using /Users/even/.nvm/versions/node/v14.17.5/bin/node itself. Use the `--scripts-prepend-node-path` option to include the path for the node binary npm was executed with.
      
      > message-subscription-websocket@0.0.1 build /Users/even/Documents/SDK/Nodejs/message-subscription-websocket-master
      > tsc
      
      open
      

      

3. Control the device with a mobile app.

   1. Turn on the test light.
   2. Adjust the brightness of the light.

4. Automatically get the push messages on WebStorm.

   

5. Display the data. For more information about field descriptions, see Message Types.

Parse push messages

Turn on the light

• Received message

  INFO 1630917829404  receive msg, jsonMessage={"messageId":"CLe1/w4QACAA","payload":"eyJkYXRhIjoidUdtTE1YempLczJpT242eWJ6WTBIUk9yemlzYlpiVEJBakIxZnVTcHQzcmF3SXEybUcvZlpUZDlUQ2ltcXBHUHpRdGY5d0Zoa1NRNklCRTJQM3lZUGo2Q3JzcUZFUXZMOVBGZUhwRDlaOUthZHpuRndTUVg2c2dSYTJmMkFORkhEVEM4cFowK2ZMbldnZTdBcVBHNExkeG9iT1BDN2tOcGs5MmhtWGpCMFBFT1oyRHU0TWJQNE5TTjQ5UWNKNE1QRTJsU2hlQ01yZWw5QjE3VFQ4QTQwMFRsdjh5MG5sMDRaTXE1YStpbUxDdmpHSDV0YWxscEkxMFJaeG9mSjcyZiIsInByb3RvY29sIjo0LCJwdiI6IjIuMCIsInNpZ24iOiI5ZjRiNTY1YjY4YjA0ODk2ZWZhODE0MDhkOTQxYzY4NyIsInQiOjE2MzA5MTc1NzYwNDh9","properties":{},"publishTime":"2021-09-06T16:39:36.048+08:00","redeliveryCount":0,"key":"vdevo*******286991"}
  

• Parse payload data

  the real message data: {
    payload: {
      data: {
        dataId: 'f73709fe-0eed-11ec-8511-024283c73485',
        devId: 'vdevo*******286991',
        productKey: 'na****z',
        status: [Array]
      },
      protocol: 4,
      pv: '2.0',
      sign: '9f4b565b68b04896efa81408d941c687',
      t: 1630917576048
    },
    messageId: 'CLe1/w4QACAA',
    properties: {},
    publishTime: '2021-09-06T16:39:36.048+08:00',
    redeliveryCount: 0,
    key: 'vdevo*******286991'
  }
  

  For more information about the payload data parsing method, see Data Signature. The payload decryption method has been encapsulated in the SDK. For more information, see src/utils.ts.

Adjust the brightness of the light

• Received message

  INFO 1630917829686  receive msg, jsonMessage={"messageId":"CLe1/w4QAyAA","payload":"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","properties":{},"publishTime":"2021-09-06T16:43:49.885+08:00","redeliveryCount":0,"key":"vdevo*******286991"}
  

• Parse data

   the real message data: {
    payload: {
      data: {
        dataId: '8e8e7a0b-0eee-11ec-8511-024283c73485',
        devId: 'vdevo*******286991',
        productKey: 'na****jz',
        status: [Array]
      },
      protocol: 4,
      pv: '2.0',
      sign: 'ba3da977270a94a9476ba6a3cde9d4e7',
      t: 1630917829885
    },
    messageId: 'CLe1/w4QAyAA',
    properties: {},
    publishTime: '2021-09-06T16:43:49.885+08:00',
    redeliveryCount: 0,
    key: 'vdevo*******286991'
  }