This holistic book is an invaluable reference for addressing various practical challenges in architecting and engineering Intelligent IoT and eHealth solutions for industry practitioners academic and researchers as well as for engineers involved in product development. The first part provides a comprehensive guide to fundamentals applications challenges technical and economic benefits and promises of the Internet of Things using examples of realworld applications. It also addresses allampampnbspimportant aspects of designing and engineering cuttingedge IoT solutions using a crosslayer approach from device to fog and cloud covering standards protocols design principles reference architectures as well as all the underlying technologies pillars and componentsampampnbspsuch as embedded systems network cloud computing data storage data processing big data analytics machine learning distributed ledger technologies and security.