# Remote Monitoring and Diagnosis for Building Maintenance Units Based on Internet of Things System
## 2 System Design and Application
### Overall System Architecture Design
51465035) and the Natural Science Foundation of Gansu Province of China (No. 20J85 RA466). Not applicable. The data that support the findings of this study are available from the corresponding author upon reasonable request. The authors would like to thank the anonymous reviewers for the insightful discussions. The authors declare no conflicts of interest. The following abbreviations are used in this manuscript: \begin{tabular}{l l} IOT & Internet of Things \\ BMUs & Building Maintenance Units \\ TCP/IP & Transmission Control Protocol/Internet Protocol \\ MQTT & Message Queuing Telemetry Transport \\ API & Application Programming Interface \\ KD & Knowledge Driven \\ DD & Data-Driven \\ CM & Condition Monitoring \\ FD & Fault Diagnosis \\ MASs & Multi-Agent Systems \\ HVAC & Heating, Ventilation and Air Conditioning \\ OAMP & Orthogonal Approximate Message Passing \\ JSON & JavaScript Object Notation \\ PLC & Programmable Logic Controller \\ HMI & Human Machine Interface \\ \end{tabular} 

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