Mosquitto

• MQTT: Message Queuing Telemetry Transport used to handle sensor data
• MQTT protocol (implemented by Mosquitto ): Designed as an extremely lightweight publish/subscribe messaging transport, it is useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium.
• MQTT Broker is responsible for receiving network connections from the client and handling the client’s requests of Subscribe/Unsubscribe and Publish, as well as forwarding the messages published by the client to other subscribers.

Image Source

ThingsBoard

An "open source platform that allows for the development, implementation, and testing of input and output data from IoT devices." thingsboard.io

Key Features

• Device management
• Data collection
• Processing and Visualization for IoT

Components

• Devices
• Assets
• Rule Engine
• Root Rule Chain

Installation

Project_Docker folder

1. Run the docker-compose up command from within the parent folder.
2. Install the Paho MQTT Python client library locally by running pip install paho-mqtt in the terminal.
3. Inside of your home folder, create two folders named .mytb-data and .mytb-logs.

Project_MQTT folder within Project_Docker folder

5. Values for temperature and humidity will start appearing after running the TBPublish.py file in VS Code.

   Temperature: 25 humidity: 95
   Temperature: 81 humidity: 58
   Temperature: 39 humidity: 69
   Temperature: 30 humidity: 54
   Temperature: 50 humidity: 71
   Temperature: 70 humidity: 92
   Temperature: 98 humidity: 54
   

6. In a browser window, navigate to http://localhost:8080/. Log in to ThingsBoard using the default tenant administrator account:

   Login: tenant@thingsboard.org
   Password: tenant
   

   
7. Open the DHT11 Demo Device by selecting it from the menu on the left. Navigate to the Latest Telemetry tab to see the latest telemetry.
8. Create a project in Firebase then add a field in the database titled temperature and initialize the corresponding field to zero.
9. Create a Firebase node, connect it to a Message Type Switch node, and add Post telemetry as the link label.
10. Realtime database updates will appear in ThingsBoard and publish temperature and humidity data.

Rule Chains

Sending information about the streaming MQTT data that is above a certain threshold to Firebase.

CreateAndClearAlarm

TempToFirebase

AlarmToFirebase and TempToFirebase connection

SaveTimeseries and CreateAndClearAlarm connection

Firebase

• alarm field publishes the live streaming data from the CreateAndClearAlarm rule chain.
• temperature field publishes temperature and humidity data.