IoT	Internet of Things
PSP	Publish/Subscribe Paradigm
TBPS	Topic-based Publish/Subscribe
MQTT	Message Queue Telemetry Transport
API	Application Programming Interface
MEC	Mobile Edge Computing
RL	Reinforcement Learning
FCM	Firebase Cloud Messaging
CF	Collaborative Filtering
RS	Recommender System
SVD	Singular Value Decomposition
ALS	Alternate Least Squares
RTT	Round-Trip Time
TU	Time Unit
ADL	Average Delivery Latency
AFT	Average Forwarding Traffic
ND	Node Degree