Abbreviations	Description
HVAC	Heating, Ventilation and Air Conditioning
CAV	Constant Air Volume
VAV	Variable Air Volume
WSN	Wireless Sensor Network
IoT	Internet of Things
MQTT	Message Queuing Telemetry Transport
RPI Broker	Raspberry Pi computer
NTP	Network Time Protocol
OpenHab	Open Home Automation Bus
SSL	Secure Sockets Layer
PHP	Personal Home Page
SSID	Service Set Identifier
PWM	Pulse-Width Modulation
LCD	Liquid Crystal Display
I2C	Inter-Integrated Circuit
ACK	Acknowledgement
CSS	Code Composer Studio
SDK	Software Development Kit
RTOS	Real-Time Operating System
CLI	Command Line Interface
PRCM	Power Reset and Clock Module
LPDS	Low-Power Deep Sleep
WAP or AP	Wireless Access Point
WPA”	Wi-Fi Protected Access 2
API	Application Programming Interface
TLS	Transport Layer Security
WLAN	Wireless Local Area Network
UART	Universal Asynchronous Receiver-Transmitter
TFT	Thin Film Transistor
SPI	Serial Peripheral Interface
MAC	Media Access Control
Variables	Description
Output_Temp	Selected temperature at the air outlet of the indoor unit
Fan_level	Selected ventilation velocity in the indoor air conditioning unit
Return_Temp	Temperature measured in the returned air of the ceiling
Set_Temp	Set-point temperature in each of the zones
Meas_Temp	Temperature measured in each of the zones
Meas_Hum	Humidity measured in each of the zones
MTEMP	Average measured temperature for all the active zones
MSET	Average set-point temperature
IV	Generation of cold (summer, IV = 1) or hot (winter, IV = −1) air flow