Middleware for energy-harvesting wireless sensor networks

Middleware for energy-harvesting wireless sensor networks

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By eeNews Europe

The software provides a universal interface for wireless communication and automatically interprets information from EnOcean telegrams. As a result, sensor data such as moisture or temperature is prepared so that different devices, servers and even cloud services can process it immediately.

EnOcean Link converts the payload of an EnOcean telegram directly into data values. In doing so, the middleware automatically takes into account all specifications of the EnOcean protocol stack and the EnOcean Equipment Profiles (EEPs) of the EnOcean Alliance as well as encryption mechanisms. This means EnOcean Link provides all wireless applications with a ready-made key to the energy harvesting wireless world. Since the software interprets all data, it also ensures the interoperability of equipment from different manufacturers.

The use of EnOcean Link saves OEMs valuable development resources, which significantly quickens the time-to-market for energy harvesting wireless applications. Instead of developing their own software for a particular application in order to interpret the communication protocol of the energy harvesting wireless technology, OEMs can use the finished middleware for this purpose immediately. The same applies to any application that integrates or further processes the energy harvesting wireless technology as well as to each EnOcean radio frequency.

Manufacturers can now focus all their attention on the application and their core activities. At the same time, EnOcean Link makes it easier to implement energy harvesting wireless networks, for smart home and M2M systems. EnOcean will update EnOcean Link continuously to users in the first yeara nd by contract thereafter.
In a smart home application, for example, a gateway can use EnOcean Link to immediately interpret the information from energy harvesting wireless sensors, including temperature, occupancy and light intensity, and forward this information to a central building control system. It does not matter if the system is networked with BACnet, KNX, Z-Wave, ZigBee, Bluetooth LE (low energy) or other automation protocols. For cloud services, working with GSM or WiFi, the data speed needed for automated control is also increased. If wireless telegrams are encrypted on the air interface, EnOcean Link decodes them before they are further processed by an external controller.

Along with EnOcean Link, EnOcean has also added Decoding Gateway to its software portfolio. This solution is aimed at manufacturers who want to integrate data encryption into their applications. The firmware adds a component for the receiving side to EnOcean’s security portfolio. When the PTM 215 energy harvesting wireless switch module transmits encrypted telegrams with rolling code based on the AES 128 standard, the TCM 300 transceiver module – programmed with Decoding Gateway – can decrypt these telegrams and then forward them to an external controller for immediate use.

Security functions can be added to existing receiving and gateway products by programming the TCM 300 transceiver module with Decoding Gateway. During the programming process, the firmware stores the rolling code together with the corresponding key on the Dolphin chip, so that no changes need to be made to the hardware. Alternatively, OEMs can also store this information on a separate EEPROM, especially for new product developments. The security information is therefore stored outside the module’s program memory.

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