Telecoms, Datacoms, Wireless, IoT


Software stack supporting latest Bluetooth features

7 September 2016 Telecoms, Datacoms, Wireless, IoT

Nordic Semiconductor announced the availability of its new production-ready S132 SoftDevice version 3.0, which increases Bluetooth low energy data throughput rates by up to 500% by employing the enhanced ‘long attribute (ATT) maximum transfer unit (MTU)’ and ‘data packet length extension (DLE)’ features of Bluetooth v4.2.

This Bluetooth SIG-member driven enhancement delivers a number of application benefits, including significantly faster over-the-air firmware updates of Bluetooth low energy devices, lower power consumption in data-intensive applications, and more responsive user experiences. Prime application examples include the latest generation of multi-function wearables and smart home (e.g. Apple HomeKit) devices that have a continual requirement to send large amounts of collected data to a hub.

Long ATT MTU enables long data values to be sent between Bluetooth low energy devices in a single continuous ‘blob’, while DLE increases the maximum amount of data that can be sent, on-air, in one packet.

In addition to Bluetooth v4.2’s increased data throughput capability, additional security is also made available to product developers with ‘link layer (LL) privacy’. This prevents tracking of private advertising Bluetooth low energy products when connecting to trusted devices. Idle connections, where data is not transmitted for long periods of time, have also been made more secure with a feature called ‘link layer (LL) ping’ which periodically performs secure authentication of connected devices.

Long ATT MTU and DLE increase the maximum Bluetooth low energy throughput by increasing the size of the MTU read and write values from 23 Bytes up to 512 Bytes, and by increasing on-air data packet length from 27 Bytes up to 251 Bytes. The result of combining these enhancements is a data throughput above 800 Kbps.

For more information contact Andrew Hutton, RF Design, +27 (0)21 555 8400, [email protected], www.rfdesign.co.za



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