How to View IoT Data with ThingsBoard

What is ThingsBoard?

ThingsBoard is an open source platform for collecting and visualizing data from Internet of Things devices. Data from any number of devices can be sent to a cloud server where it can be viewed or shared through a customizable dashboard.

This guide will show how to install ThingsBoard on a Linode and use a Raspberry Pi to send simple telemetry data to a cloud dashboard.

Note
This guide will use a Raspberry Pi 3 with a Sense HAT. You can substitute any device capable of sending telemetry data, or use curl to experiment with ThingsBoard without using any external devices.

Install ThingsBoard

ThingsBoard runs on Java 8, and the Oracle JDK is recommended.

Install software-properties-common:

sudo apt install software-properties-common

Add the Oracle PPA repository:

sudo apt-add-repository ppa:webupd8team/java

Update your system:
```
sudo apt update
```
Install the Oracle JDK. To install the Java 9 JDK, change java8 to java9 in the command:
```
sudo apt install oracle-java8-installer
```
Check your Java version:
```
java -version
```

Set Up PostgreSQL

Install PostgreSQL:

sudo apt install postgresql postgresql-contrib

Create a database and database user for ThingsBoard:

sudo -u postgres createdb thingsboard
sudo -u postgres createuser thingsboard

Set a password for the thingsboard user and grant access to the database:

sudo -u postgres psql thingsboard
ALTER USER thingsboard WITH PASSWORD 'thingsboard';
GRANT ALL PRIVILEGES ON DATABASE thingsboard TO thingsboard;
\q

Install ThingsBoard

Download the installation package. Check the releases page and replace the version numbers in the following command with the version tagged Latest release:
```
wget https://github.com/thingsboard/thingsboard/releases/download/v1.3.1/thingsboard-1.3.1.deb
```
Install ThingsBoard:
```
sudo dpkg -i thingsboard-1.3.1.deb
```

Open /etc/thingsboard/conf/thingsboard.yml in a text editor and comment out the HSQLDB DAO Configuration section:

File: /etc/thingsboard/conf/thingsboard.yml

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# HSQLDB DAO Configuration
#spring:
#  data:
#    jpa:
#      repositories:
#        enabled: "true"
#  jpa:
#    hibernate:
#      ddl-auto: "validate"
#    database-platform: "org.hibernate.dialect.HSQLDialect"
#  datasource:
#    driverClassName: "${SPRING_DRIVER_CLASS_NAME:org.hsqldb.jdbc.JDBCDriver}"
#    url: "${SPRING_DATASOURCE_URL:jdbc:hsqldb:file:${SQL_DATA_FOLDER:/tmp}/thingsboardDb;sql.enforce_size=false}"
#    username: "${SPRING_DATASOURCE_USERNAME:sa}"
#    password: "${SPRING_DATASOURCE_PASSWORD:}"

In the same section, uncomment the PostgreSQL configuration block. Replace thingsboard in the username and password fields with the username and password of your thingsboard user:

File: /etc/thingsboard/conf/thingsboard.yml

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# PostgreSQL DAO Configuration
spring:
  data:
    jpa:
      repositories:
        enabled: "true"
  jpa:
    hibernate:
      ddl-auto: "validate"
    database-platform: "org.hibernate.dialect.PostgreSQLDialect"
  datasource:
    driverClassName: "${SPRING_DRIVER_CLASS_NAME:org.postgresql.Driver}"
    url: "${SPRING_DATASOURCE_URL:jdbc:postgresql://localhost:5432/thingsboard}"
    username: "${SPRING_DATASOURCE_USERNAME:thingsboard}"
    password: "${SPRING_DATASOURCE_PASSWORD:thingsboard}"

Run this installation script:

sudo /usr/share/thingsboard/bin/install/install.sh --loadDemo

Start the ThingsBoard service:

sudo systemctl enable thingsboard
sudo systemctl start thingsboard

NGINX Reverse Proxy

ThingsBoard listens on localhost:8080, by default. For security purposes, it’s better to serve the dashboard through a reverse proxy. This guide will use NGINX, but any webserver can be used.

Install NGINX:
```
sudo apt install nginx
```

Create /etc/nginx/conf.d/thingsboard.conf with a text editor and edit it to match the example below. Replace example.com with the public IP address or FQDN of your Linode.

File: /etc/nginx/conf.d/thingsboard.conf

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server {
    listen 80;
    listen [::]:80;

    server_name example.com;

    location / {
        # try_files $uri $uri/ =404;
        proxy_pass http://localhost:8080/;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $host;
    }
}

Restart NGINX:
```
sudo systemctl restart nginx
```

Set Up ThingsBoard Device

Navigate to your Linode’s IP address with a web browser. You should see the ThingsBoard login page:
The demo account login tenant@thingsboard.org and the password is tenant. You should change this to a more secure password after you have signed in.
From the main menu, click on the Devices icon, then click the + icon in the lower right to add a new device.
Choose a name for your device. Set the Device type to PI.
After the device is added, click on its icon in the Devices menu. Click on COPY ACCESS TOKEN to copy the API key for this device (used below).

Configure Raspberry Pi

Note
The following steps assume that you have terminal access to a Raspberry Pi, and that Sense HAT and its libraries are already configured. For more information on getting started with Sense HAT, see the Raspberry Pi official documentation. If you would prefer to use curl to send mock data to ThingsBoard, you can skip this section.

Basic Python Script

Using a text editor, create thingsboard.py in a directory of your choice. Add the following content, using the API key copied to your clipboard in the previous section:

File: thingsboard.py

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#!/usr/bin/env python

import json
import requests
from sense_hat import SenseHat
from time import sleep

# Constants

API_KEY          = "<ThingsBoard API Key>"
THINGSBOARD_HOST = "<Linode Public IP Address>"

thingsboard_url  = "http://{0}/api/v1/{1}/telemetry".format(THINGSBOARD_HOST, API_KEY)

sense = SenseHat()


data = {}

while True:
    data['temperature'] = sense.get_temperature()
    data['pressure']    = sense.get_pressure()
    data['humidity']    = sense.get_humidity()

    #r = requests.post(thingsboard_url, data=json.dumps(data))
    print(str(data))
    sleep(5)

Test the script by running it from the command line:

python thingsboard.py

Basic telemetry should be printed to the console every five seconds:

{'pressure': 1020.10400390625, 'temperature': 31.81730842590332, 'humidity': 19.72637939453125}
{'pressure': 1020.166259765625, 'temperature': 31.871795654296875, 'humidity': 20.247455596923828}
{'pressure': 1020.119140625, 'temperature': 31.908119201660156, 'humidity': 19.18065643310547}
{'pressure': 1020.11669921875, 'temperature': 31.908119201660156, 'humidity': 20.279142379760742}
{'pressure': 1020.045166015625, 'temperature': 31.92628288269043, 'humidity': 20.177040100097656}

If the script is working correctly, remove the print statement and uncomment the r = requests.post() line. Also increase the sleep() time interval:

File: thingsboard.py

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while True:
    data['temperature'] = sense.get_temperature()
    data['pressure']    = sense.get_pressure()
    data['humidity']    = sense.get_humidity()

    r = requests.post(thingsboard_url, data=json.dumps(data))
    sleep(60)

Create a Systemd Service

You should now be able to run the script from the command line to transmit temperature, pressure, and humidity data once per minute. However, to make sure that data is sent continually, it’s a good idea to enable a new service that will run the script automatically whenever the server is restarted.

Copy the script to /usr/bin/ and make it executable:

sudo cp thingsboard.py /usr/bin/thingsboard.py
sudo chmod +x /usr/bin/thingsboard.py

Create a service file to run the Python script as a service:

File: /lib/systemd/system/thingsdata.service

[Unit]
Description=Push telemetry data from Sense HAT to ThingsBoard.

[Service]
Type=simple
ExecStart=/usr/bin/thingsboard.py

[Install]
WantedBy=multi-user.target

Enable and start the service:

sudo systemctl enable thingsdata.service
sudo systemctl start thingsdata.service

Check the status of the new service:

sudo systemctl status thingsdata.service

Send Data with cURL

Note
Skip this section if you are using a Raspberry Pi.

Create a sample JSON file with dummy data:

File: dummy_data.json

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{
  "temperature": 38,
  "humidity": 50,
  "pressure": 1100
}

Use curl to send a POST request to the ThingsBoard server:

curl -v -X POST -d @dummy_data.json http://$THINGSBOARD_HOST:$THINGSBOARD_PORT/api/v1/$ACCESS_TOKEN/telemetry --header "Content-Type:application/json"

View Data in ThingsBoard

If the service is running successfully, data should be transmitted to your ThingsBoard server every 60 seconds.

Log back into the ThingsBoard dashboard in your browser and click on your device’s card in the Devices menu. Choose the Latest Telemetry tab from the resulting details page. You should see the temperature, humidity, and pressure data from your device:
Click the checkbox next to one of the data types and then click Show on Widget.
Use the drop-down and carousel menus to choose a one of the preset widgets to display this data type on a dashboard. Click Add to Dashboard when you have chosen a widget.

Next Steps

The widgets provided by ThingsBoard can be easily edited, and it is possible to create new ones as well. Multiple widgets, representing multiple data streams from multiple devices, can be combined to produce customized dashboards. These dashboards can then be made public, or shared with customers.

For more information on how to customize and set up widgets and dashboards, see the ThingsBoard Widget Library and Dashboard page The ThingsBoard Github repo also has images of example dashboards.

More Information

You may wish to consult the following resources for additional information on this topic. While these are provided in the hope that they will be useful, please note that we cannot vouch for the accuracy or timeliness of externally hosted materials.

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Viewing IoT Data with ThingsBoard

What is ThingsBoard?

Install ThingsBoard

Set Up PostgreSQL

Install ThingsBoard

NGINX Reverse Proxy

Set Up ThingsBoard Device

Configure Raspberry Pi

Basic Python Script

Create a Systemd Service

Send Data with cURL

View Data in ThingsBoard

Next Steps

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