How to obtain data on mobile phones and web pages after the SCM data is uploaded to Alibaba cloud Internet of things platform?

Recently I met a need ： MCU uploads data to Alibaba cloud Internet of things platform , The mobile terminal or Web terminal can obtain data from the Internet of things platform and display it , Add another mobile terminal / The web side controls the single chip microcomputer through the Internet of things platform .

Finally, the method provided by Alibaba cloud Internet of things platform is adopted , Use the function of rule engine data forwarding , hold Topic 1 Forward your message to Topic 2 in ,

One 、 Create a product and customize a theme

When creating a topic, it is recommended to select publish and subscribe for operation permission , Convenient debugging . In the theme are ${deviceName}, Every device under the representative product can use this type of theme , Just put deviceName Change to equipment name （ Fill in the topic when developing " ${} " Get rid of ）, In this way, each device has its own theme , Then use the data flow function , Each device can communicate .

Two 、 Create a device under this product

When creating a device , Device name （ I use web1 To represent web devices ） Please fill in all the suggestions . After creating the device , The device is inactive , At this time, you need to copy the triples of the device , Resolve the domain name of Alibaba cloud Internet of things platform 、 user id、 user name 、 Password and other information , It is used to connect the single chip microcomputer to the Internet of things platform .

3、 ... and 、 Parse triples

There are many tools for parsing triples , Alibaba officials also provide , I am used to using the following tool .

Four 、 The device is connected to the Internet of things platform

I'll use it here MQTT.fx To simulate the connection of the web end to the Internet of things platform , Fill in the relevant information , Click on connect button , If it is a real SCM device , This information is also needed to connect to the Internet of things platform .

After successful connection , Refresh the device , You can see web1 This device is already online

Check it out web1 Whether the theme subscribed by the device can be used normally .

5、 ... and 、 Rule engine data forwarding function

Follow the steps above , I have created a project named stm32 The equipment , Used to simulate the real MCU to send messages to the Internet of things platform , Then flow the message to web1 In this . Now make sure both devices are online .

Click cloud product flow in the rule engine on the right , Click Create rule , The name of the rule can be arbitrary , But there is a hole in the data format ：

• If you choose this json Format , that stm32 The data sent to the Internet of things platform must be json Format , Can be transferred to another theme , otherwise , Another topic is that you can't receive any messages .
• If binary is selected , Then feel free , Any message can be forwarded , Choose... According to your personal needs .

Click Edit rule , On this page , Click "write" in data processing SQL, This is where the data comes from ,SQL Statements can play a certain role in filtering , use * Number means forwarding all data , the reason being that stm32 Give it to me. web1 Send data on the web , So the data source is stm32 The theme under the device （ The customized theme when creating the product , It will assign a theme to each device under the product ）.

Then add an operation to the forward data , Choose to publish to another topic , Then fill in the subject of our target device with the following information

After editing the rule , Remember to return to the startup rule , Here we are ！

6、 ... and 、 test

stm32 issue web1：

stm32 Send it to your cell phone ：

The above is the process of my test , If there are mistakes in the blog, please point out , Friends who don't understand this process can leave comments ！