I. Introduction  
II. Background  
A. Enterprise Internet of Things (E-IoT)  
B. Consumer IoT vs. E-IoT  
C. Architecture of E-IoT Systems  
III. Scope of the Survey  
IV. E-IoT Devices Layer: Components and Security  
V. Communications Layer  
VI. Monitoring and Applications Layer  
VII. Business Layer  
VIII. Lessons Learned and Open Issues  
IX. Related Work  
X. Conclusion