1. The Internet of Things (IoT)

2. Objects connect to the Internet They talk to each other
Basic Concepts
Objects connect to the Internet
They talk to each other
Enabled by low cost electronics
and Open Source Software (free)

3. The Equipment Raspberry Pi Over 5 million sold Raspberry Pi Zero
Ethernet
WiFi
Bluetooth
4 Standard USB Ports
WiFi
Bluetooth
1 Micro USB Port

4. The Equipment

5. The Equipment

6. The Equipment

7. The Equipment

8. The Equipment

9. The Equipment

10. The Equipment

11. and 4 channel relay controller
The Equipment
An Electronic HIU
together with a
Raspberry Pi
and 4 channel relay controller

12. Ethernet Local Area Network (LAN)

13. Node-RED Visual Programming / Wiring

14. Node-RED JavaScript Programming

15. Node-RED User Interface

16. Node-RED Web Server
Web pages can be served depending on the URL request. This is an example of an open-source graphing library used to detail hot water load over 86,400 data points (every second of a day) on the address

17.
provides a simple and well established means of communication.
Messages can be both sent and received.
Files can be easily attached to s.
Credentials are required to access server, stored locally in hashed format.

18. MQTT Communications
MQTT Server acts as a public or password protected post office, typically running Mosquito on a Raspberry Pi.
Messages are distributed by their topic, and can be stored on server for new subscribers.
Messages have three levels of Quality of Service (QoS):
0. once only – receive if available
1. at least once – guarantees receipt, possibly more than once
2. exactly once – guarantees receipt one time only
Wildcards can be used to subscribe to multiple topics: Topic = nodehiu/thermalint/sudbury/outsideTemperature Topic = nodehiu/thermalint/sudbury/HIU/rig1/flowTemperature Topic = nodehiu/thermalint/sudbury/#

19. VPN Virtual Private Network
OpenVPN can be installed on a Raspberry Pi within a Local Area Network to provide secure remote access.
Software is available for all computing platforms to enable remote connection using generated certificates.
Once connected, devices on LAN become available.