Table of Contents
Foreword ix
Preface xi
Part I Getting Started
1 Getting Started 3
What You'll Learn in This Chapter 3
Defining Your System 4
Breaking Down the Problem 4
Defining Relevant Outcomes 5
Architecting a Solution 7
Setting Up Your Development and Test Environment 11
Step I: Prepare Your Development Environment 14
Step II: Define Your Testing Strategy 29
Step III: Manage Your Design and Development Workflow 34
Thoughts on Automation 40
Programming Exercises 43
Testing the Constrained Device App 46
Testing the Gateway Device App 47
Conclusion 47
2 Initial Edge Tier Applications 49
What You'll Learn in This Chapter 49
Design Concepts 50
Tracking Your Requirements 51
Programming Exercises 52
Add System Performance Tasks to the Constrained Device Application 54
Add System Performance Tasks to the Gateway Device Application 63
Additional Exercises 72
Conclusion 72
Part II Connecting to the Physical World
3 Data Simulation 77
What You'll Learn in This Chapter 77
Simulating Sensors and Actuators 78
Generating Simulated Data Using a Sensor Data Generator Class 78
Programming Exercises 81
Integrating Sensing and Actuation Simulation Within Your Application Design 82
Representing Sensor and Actuator Data Within the Application 83
Create Data Containers to Support Data Collection and Actuation 84
Simulating Sensors 89
Simulating Actuators 93
Connecting Simulated Sensors with the Sensor Adapter Manager 100
Connecting Simulated Actuators with the Actuator Adapter Manager 108
Create and Integrate the Device Data Manager 111
Additional Exercises 119
Hysteresis Management 119
Conclusion 119
4 Data Emulation 121
What You'll Learn in This Chapter 121
Emulating Sensors and Actuators 122
Setting Up and Configuring an Emulator 123
The Sense-Emu Sense HAT Emulator 123
Programming Exercises 124
Integrating Sensing and Actuation Emulation Within Your Application Design 125
Emulating Sensors 126
Emulating Actuators 128
Connecting Emulated Sensors with the Sensor Adapter Manager 131
Connecting Emulated Actuators with the Actuator Adapter Manager 135
Additional Exercises 137
Threshold Management 137
Conclusion 137
5 Data Management 139
What You'll Learn in This Chapter 139
Data Translation and Management Concepts 139
Programming Exercises 140
Data Translation in the Constrained Device App 142
Data Translation in the Gateway Device App 146
Additional Exercises 159
Proactive Disk Utilization Management 159
Conclusion 160
Part III Connecting to Other Things
6 MQTT Integration-Overview and Python Client 169
What You'll Learn in This Chapter 170
About MQTT 170
Connecting to a Broker 171
Message Passing 172
Control Packets and the Structure of an MQTT Message 174
Adding MQTT to Your Applications 177
Installing and Configuring an MQTT Broker 179
Programming Exercises 179
Create the MQTT Connector Abstraction Module 182
Add Callbacks to Support MQTT Events 191
Add Publish, Subscribe, and Unsubscribe Functionality 192
Integrate the MQTT Connector into Your CDA 197
What About Security? 199
Additional Exercises 199
Conclusion 200
7 MQTT Integration-Java Client 201
What You'll Learn in This Chapter 201
Programming Exercises 202
Create the MQTT Connector Abstraction Module 203
Add Callbacks to Support MQTT Events 207
Add Publish, Subscribe, and Unsubscribe Functionality 209
Integrate the MQTT Connector into Your GDA 213
What About Security and Overall System Performance? 218
Additional Exercises 218
Subscriber Callbacks 218
CDA to GDA Integration 218
Conclusion 219
8 CoAP Server Implementation 221
What You'll Learn in This Chapter 222
About CoAP 222
Client to Server Connections 222
Request Methods 223
Message Passing 224
Datagram Packets and the Structure of a CoAP Message 228
Putting It All Together 229
Programming Exercises 234
Add CoAP Server Functionality to the Gateway Device Application 236
Add CoAP Server Functionality to the Constrained Device Application (Optional) 250
Additional Exercises 253
Add More Resource Handlers 253
Add a Custom Discovery Service 253
Add Dynamic Resource Creation 254
Conclusion 254
9 CoAP Client Integration 255
What You'll Learn in This Chapter 255
Concepts 256
Programming Exercises 259
Add CoAP Client Functionality to the Constrained Device Application 260
Add CoAP Client Functionality to the Gateway Device App (Optional) 278
Additional Exercises 279
Add a Robust OBSERVE Cancel Feature 279
Add Support for DELETE and POST 280
Conclusion 280
10 Edge Integration 281
What You'll Learn in This Chapter 281
Concepts 282
Security Exercises 283
Adding TLS Support to Your MQTT Broker 283
Add Security Features to Your Gateway Device App MQTT Client Connector 283
Add Security Features to Your Constrained Device App MQTT Client Connector 289
Functional Exercises 292
Adding Business Logic to the Gateway Device App 292
Adding Business Logic to the Constrained Device App 295
Performance Testing Exercises 296
Additional Exercises 298
Add DTLS Support to Your CoAP Client and Server 299
Conclusion 299
Part IV Connecting to the Cloud
11 Integrating with Various Cloud Services 303
What You'll Learn in This Chapter 304
Concepts 304
Programming Exercises 307
Add the Cloud Client and Other Related Components 307
Integrating with an IoT Cloud Service Provider (CSP) 315
Ubidots Connectivity Overview Using MQTT 316
AWS IoT Core Connectivity Overview Using MQTT 322
Additional Exercises 336
Analyzing and Acting on Time-Series Performance Data 336
Conclusion 337
12 Taming the IoT 339
What You'll Learn in This Chapter 339
IoT Ecosystem Enablers 339
Sample IoT Use Cases 342
Shared Enablers and a Common Notional Design 343
Use Case 1: Home Environment Monitoring and Temperature Adjustment 345
Use Case 2: Garden Monitoring and Water Adjustment 347
Use Case 3: Pond Quality Monitoring 348
Conclusion 350
Appendix. Design Road Maps 351
Bibliography 371
Index 375
