2005 : U-Net 1.0 released by Everspring. This protocol is an evolution from previous Sub-GHz protocols used by Everspring in home automation/alarm products sold in the European market for nearly 10 years. Alarm products adopting U-net were released.
2007 : U-Net 2.0 released. Taking advantage of U-net’s fast transmission, this update adds bulk data transfer for connection to PC and gateways for large message packets. It also added enhanced low power mode for extended battery life for sensor devices. More data-intensive automation devices such as metering plugs and environment sensors were added to coincide with release. With the advent of smartphone and cloud servers, this version also formed the backbone of new generation smart home products, transferring large data rapidly between controller and gateway.
2012 : U-Net 3.0 released, among its new features include support for periodic auto-report by devices and automatic pairing when first power (‘Auto-binding’) to facilitate installation. This version was used on projects for telecom operators throughout Europe, and forms the largest market adoption of U-net to date. Significant minor updates were later added based on market feedback and field tests.
2015 : U-Net 4.0 released, major enhancements include AES-128 encryption, support for antenna diversity and sensor software upgrade by OTA (Over-The-Air). These enhancements add toughness and robustness to the protocol for special IoT application in rugged wireless environments. Successful deployments include site monitoring of LTE base station projects in the Middle East and non-invasive AC mains power metering in the French market.
More than 1.5 million products have been shipped adopting U-net technology.