The Industrial Internet of Things (IoT) requires industrial wireless sensor networks (WSNs) with stringent reliability and security. Since such networks must operate reliably more than ten years without intervention, industrial WSNs must cope with severely changing environmental conditions over time. In addition, they must also be scalable and flexible so that the networks can support growing business needs and data traffic over a significant period of time. Linear Technology’s SmartMesh networks deliver >99.999% data reliability in rigorous end-to-end testing and in the field. Over 50,000 SmartMesh networks have been deployed worldwide in demanding applications such as data centers, factories, power utilities, fenceline security, outdoor environmental monitoring, agricultural applications, mining and tunnels, and industrial process.