Application practice of helium decentralized lorawan network in Tencent cloud IOT development platform

brief introduction

This document describes Helium console Use , Will be standard LoRaWAN The terminal is added to Helium People’s Network, And through Tencent cloud IoT explorer Internet of things development platform integration , Push messages and display data on wechat official account and Tencent apps .

Helium People’s Network Is a global 、 Distributed open network . adopt Hotspots（LoRaWAN gateway ）,Helium Can support LoRaWAN The IOT device of the protocol provides public wireless network coverage , Make it easier for Internet of things devices to access the Internet and transmit data .

preparation

Equipment preparation

• a Helium Miner LoraWAN gateway
• A standard LoRaWAN CN470 OTAA terminal , The frequency information used in China is shown in the following table

Signal number	Uplink frequency point	The downside RX1 Frequency point	The downside RX2 Frequency point
1	486.3	506.7	505.3
2	486.5	506.9	505.3
3	486.7	507.1	505.3
4	486.9	507.3	505.3
5	487.1	507.5	505.3
6	487.3	507.7	505.3
7	487.5	507.9	505.3
8	487.7	508.1	505.3

• This document uses Nanjing Rejeee Temperature and humidity sensor as a reference

Temperature and humidity sensor

Helium Console Use

establish Helium console Account

land Helium Console Registered users , have access to google Account login directly , Or create a new account by email . After the new account is completed , You need to log in to the registered email for confirmation , After confirmation, you can log in with the new account Helium Console Console

register Console Account

Successfully log in to the console

Data Credits

Use Helium People’s Network Send and receive data , Need to be used Data Credits（ abbreviation DC）, New account , The official presents 10000DC, Every time 1DC Can send 24byte data .

Suppose a LoRaWAN Terminal per 5 Every minute , Every bag 24Byte, that 1 dollar , namely 6.5 element RMB Can send 10 Million packets , Every time 5 Every minute , Can send continuously 1 year .

1 DC = 24 Byte Packet = $0.00001 USD

If in the account DC Consume up , Need to burn HNT To get DC, Otherwise, data cannot be received and sent over the network .

Data Credits

Add equipment （Add Devices）

• Helium People’s Network Support only LoRaWAN OTAA equipment , And fixing Region Of Frequency plan
• Obtain from the equipment manufacturer LoRaWAN Triple information of the device ：Deveui、Appeui、Appkey, As shown in the following figure console Add device information
• When the device first joins the network , Its key needs to be added to the blockchain , And send the updated block to Hotpots, This process requires at most 20 minute
  Add device information

The device successfully accesses the network and reports data

Application data decoding （My Functions）

In the last step, we have obtained the original data reported by the equipment , Now we need to parse the original data , Make this part of the data easier to read ,Helium Console Provide My functions function , Through this function , You can use a short script file to Hex Data is transformed into more readable Json Format data , such as ： Report Hex data ：00 3e 24 04 01 00 05 3a, The parsed data ：{ "power": 30,"temp_value": 25.6,"hum_value": 58 }

• Step 1 ： Create function name 、 decoder、Customer Script
• Step 2 ： Create a function script , You can debug the output through the script validator on the right

My Functions

Application Integration （Integrations）

Helium Console Support multiple application integration schemes to present data , But most of them are tools used overseas , Not applicable in China , Here we will introduce MQTT Integration tool , With Tencent cloud IoT explorer Internet of things development platform , It also presents data and alarm information through the wechat applet Tencent Lianlian and wechat official account under the Tencent system .

The data presented consists of two types ：

• application payload data , Temperature and humidity data are used here
• Internet Information , Include the uploaded gateway number 、 Signal strength 、 Signal-to-noise ratio 、 Frame sequence number, etc

Tencent cloud IoT Platform use

Create in Tencent cloud MQTT terminal

• Step 1： Log in to Tencent cloud Internet of things development platform , Create projects and products - The product name ： Enter the user-defined product name - The product type ： choice “ User customization ”. - Device type ： choice “ equipment ”. - authentication ： choice “ Key authentication ”. - communication mode ： choice “ other ”.
  New product
• Step 2： Configuration model
  • Application data
    • power: soc
    • temp_value： temperature
    • hum_value： humidity
  • Network related data
    • rssi： Signal strength
    • snr： Signal-to-noise ratio
    • frequency： The frequency of reporting data
    • dev_eui：Deveui, equipment EUI Number
    • fcnt： Frame sequence
    • channel： channel
    • name： The Internet name
    • spreading： Spread spectrum factor

Provide Object model file sample JSON Format file , Import directly into the product through the following figure .

Import model file

After importing successfully , The results are as follows ：

Successfully imported object model

• Step 3 ： establish MQTT equipment
  • New equipment ： Create a new device , The equipment name is used in helium console Device name created , The two names need to be consistent
  • Get device information （ Used to create MQTT Connected account and password ）
    • Equipment name
    • product ID
    • Device key
• Step 4 ： establish MQTT Connected account and key Tencent cloud generates a unique key for each device , adopt Step 3 Get the information to create MQTT Connected domain name 、 Account 、 password . There are two generation methods , Pay attention to the timeliness of the account password , If you need a long test , It is recommended to use the second scripting method to generate , Change the validity of the account password ： - adopt password Generation tool
  MQTT Account and password production
  - adopt python、C Language 、Java Wait for scripts to be generated in different languages , Reference resources MQTT Access
• obtain MQTT Connect triples and Topic
  • username: With the above tools
  • password: With the above tools
  • domain name ：PRODUCT_ID.iotcloud.tencentdevices.com, here PRODUCT_ID Is a variable parameter , Users need to fill in the products generated automatically when creating products ID, for example T****DS8G.iotcloud.tencentdevices.com
    • The upside topic: $thing/up/property/PRODUCT_ID/${deviceName}
    • The downside topic: $thing/down/property/PRODUCT_ID/${deviceName}

helium console establish MQTT Integrate

• Step 1 ： helium console add to MQTT Integrate
  add to MQTT Integrate
• Step 2 ： To configure MQTT Connection information , Use the account obtained in the previous step 、 password 、 Fill in the following rules with domain name and other information ： - Endpoint: mqtt://username:[email protected]:1234 - uplink Topic:$thing/up/property/PRODUCT_ID/{{device_name}}undefined - downlink Topic:$thing/down/property/PRODUCT_ID/{{device_name}}
  MQTT Configuration example
• Step 3 : Set up Integration Name
• Step 4 : Set up JSON Information template , It needs to correspond to the object model configured by Tencent cloud

{
  "method":"report",
  "params":
  {
   {{#decoded}}{{#payload}}
   "power": {{power}},
   "temp_value": {{temp_value}},
   "hum_value": {{hum_value}},
  {{/payload}}{{/decoded}}
  "dev_eui": "{{dev_eui}}",
  "fcnt": {{fcnt}},
  {{#hotspots}}
  "channel": {{channel}},
  "frequency": {{frequency}},
  "name": "{{name}}",
  "rssi": {{rssi}},
  "snr": {{snr}},
  "spreading": "{{spreading}}"
  {{/hotspots}}
  }
}

• Step 4 ： Set up Flow Helium Console Provides powerful Flow function , Devices can be created by graphical dragging , The relationship between functionality and integration . Now let's put the equipment Device、 decoder Fuctions、 Application Integration Integrations Three components are connected in series , Get through the data flow .

establish Flow

Helium MQTT Integrate Success and Tencent cloud IOT Establishing a connection ：

Successfully set up MQTT Connect

Tencent cloud successfully obtained the device terminal data ：

Tencent cloud obtains device data

Tencent cloud configuration Tencent Lianlian applet

Tencent has repeatedly provided official small programs , Users do not need to focus on the underlying implementation , Just configure the exclusive interactive interface , Small program application development can be realized , Quickly render data through applets , Improve development efficiency .

• Step 1 : Enter Tencent cloud IoT Console , Configure Tencent continuous presentation data panel in interactive development , You can select a panel style , And preview through the right panel
  Tencent serial panel configuration
• Step 2 : Search and open Tencent Lianlian applet in wechat , Scanning device QR code , Add the device to Tencent Lianlian applet
  Tencent repeatedly scans QR code , Add equipment
• Step 3 : Click on the device in Tencent's small programs , It can be observed that the equipment reports data
  Tencent's serial applets present data

Tencent cloud data development , Realize the data push of official account

Tencent cloud IoT It can meet the data and status reported by the developer according to the device , By defining rules in the cloud , The alarm can be realized 、 The notification message is pushed to Tencent Lianlian official account or App push , Reduce the cost for developers to process the data reported by the device . The following is a simple case to realize the push of official account , Detailed documents can be referred to Tencent cloud IoT Data development configuration

• Step 1: New data development
• Step 2: Set push to device data - Choose products - Select Properties - preservation
  Set device data
• Step 3: Set data filtering rules - Set the condition combination method - Set filter conditions - Sure to save
  Set data filtering conditions
• Step 4: Set up official account push - Set notification type - Set push title - Set push content
  Set push content
• Step 5: Focus on Tencent's official account

Focus on Tencent's official account , Get push data information

Official account data push