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Key Points
Innovative Tool for Demanding UsersTraffic analysis is one of the key day-to-day activities for Bluetooth engineers looking to rapidly test and debug their prototypes and products. Unfortunately, Bluetooth over-the-air sniffing has always been difficult to perfect. Legacy sniffing methods suffered from major technological drawbacks, making them unreliable and even unusable in several circumstances, making Bluetooth engineers' tasks much more difficult. With its revolutionary whole-band Digital Radio, Ellisys lifts protocol
capture and analysis to new heights, radically overcoming the drawbacks of
those legacy approaches to Bluetooth sniffing. The Ellisys all-in-one
whole-band sniffer robustly records any packet, at any time, from any neighboring
piconet, with zero-configuration and without being intrusive.
Industry’s First Whole-Band CaptureBluetooth wireless technology was originally designed to be robustly impervious to interference on the much-used 2.4 GHz ISM band. It was also designed to be difficult to sniff, for security reasons. To meet these criteria, a Bluetooth radio uses from 40 (low energy) to 79 (classic) channels pseudo-randomly according to a hopping sequence defined at the piconet’s connection time. A hopping sniffer tries to actively synchronize on a specific hopping sequence, and captures the packets only after a successful synchronization. This kind of sniffer has several inherent limitations, making it more difficult to use, less reliable, and usable only in a limited set of scenarios. Ellisys has created the industry's first wideband sniffer in 2010 that overcomes all of these drawbacks and adds innovative and ground-breaking features, opening new horizons for Bluetooth debugging and interoperability testing. The whole-band capture approach is as simple as it is powerful: instead of listening to just a few channels, the sniffer captures all channels concurrently. The sniffer thus does not need to synchronize to a piconet; it will listen passively to all nearby Bluetooth piconets, scatternets, and other topologies such as mesh, without any required configuration. Industry’s First Reconfigurable Bluetooth Digital RadioWith its innovative reconfigurable radio, the Ellisys sniffer can uniquely be updated by software to support changes in the specification, without any change to the hardware, and even without any interaction from the user. For instance, this flexibility allowed for the addition of next generation Bluetooth baseband features (such as enhanced AES security, Connectionless Broadcast, and more recent features like BLE Coded PHY and 2Mbps support) several months before these features were officially released in an updated specification. Additionally, the Ellisys BEX400 comes with free lifetime software updates, so all customers can benefit from these great additions free-of-charge! Industry’s First All-in-One SnifferCapturing wireless traffic is a very important aspect of Bluetooth debugging, but other information is equally important for understanding the big picture. This is another aspect where the Ellisys sniffer excels. The Bluetooth Explorer sniffer supports one-click concurrent and tightly synchronized capture of:
Protocols and ProfilesBluetooth protocols and profiles are displayed in an easy-to-understand, high-level procedures-oriented chronological format in the Overview windows and fully detailed to the lowest bit/byte level in the linked Details view. Classic Bluetooth, Low Energy, and HCI traffic is displayed in designated Overviews real-time, as capture progresses. The user is provided various controls to easily customize any Overview, including powerful filtering and coloring capabilities designed to quickly isolate specific protocols, profiles, or communications of interest. Traffic can be presented at the highest level of abstraction and the user can drill down to show all intermediate levels, down to the most basic elements, such as packet-only views. Message Sequence ChartsWhile the analyzer’s powerful protocols and profiles display is most efficient for engineers, Message Sequence Charts are usually preferred for creating reports or sharing technical information with specification experts or others not typically involved in using protocol analysis tools. The Ellisys solution is to create a Message Sequence Chart representation from a previously filtered and annotated protocols view. With this approach, engineers can include precisely the information they want, the way they want, and create a clear depiction showing exactly the information desired. HCI Analysis [PRO]Wireless traffic is of course one of the most useful elements of debugging information for Bluetooth engineers, but Host Controller Interface (HCI) traffic is an equally important complement of information for getting a clear and complete picture of the situation. The HCI is an electrical interface defined by the Bluetooth specification for communications between the host controller and the radio. The Ellisys BEX400 supports capture of USB HCI, UART HCI and SPI HCI. Any and all HCI traffic is captured concurrently with the wireless traffic using the same precision clock for perfect synchronization and timing analysis, and is displayed in the highly-optimized Ellisys analysis software. HCI capture is also a very convenient feature when working with devices that implement BR/EDR Secure Simple Pairing (SSP) or BLE Secure Connections. The Ellisys analysis software automatically extracts any Link Key exchanged over HCI and uses it to decrypt the wireless traffic, all without any user interaction. Spectrum Analysis [PRO]The 2.4 GHz ISM band used by Bluetooth is quite busy. Other users of this band include Wi-Fi, LTE, ZigBee, ANT and a broad range of other proprietary and commercial technologies. All of these users interfere with each other and it is often necessary to have a better understanding of the wireless environment. The spectrum display offered by the Ellisys sniffer is the perfect tool for coexistence debugging, wireless characterization, or simply for visualizing the RF environment. It captures the spectrum signal strength (RSSI) in all Bluetooth channels with a configurable precision of up to 1 microsecond, and displays this information in synchronization with the Bluetooth packets. Logic Analysis [PRO]The logic analysis feature enables capture of any logic signal, in synchronization with the wireless and HCI traffic. Any digital signal is supported, including general-purpose I/Os or dedicated pins such as TX/RX Active. Another of the many applications for this feature is keeping track of a device’s power consumption in various states, by using dedicated hardware such as comparators for determining whether key thresholds are exceeded. These signals can then be visualized with 5-nanosecond precision and compared with the other captured streams in the powerful Instant Timing view of the Ellisys software. Audio AnalysisCaptured audio streams can be easily played back, even during capture. LC3 traffic is automatically detected using a test equipment-grade LC3 codec, even without capture of LC3 configuration traffic. Finding packets carrying specific audio portions or at specific events is easily done. Audio captured over HCI or from an Audio I2S input [PRO] can be played back. This enables characterization of the complete audio chain, including the uncompressed audio provided to the source, the audio transmitted wirelessly, and the decoded audio at the receiver device. Audio streams are exportable to WAV format. Automated and Long-Term CaptureThere are various user applications that require the use of the analyzer in an automated fashion, often under control of user-defined software applications performing a variety of tasks. These applications may include long-term test environments, integration of the analyzer into a mobile platform, and other usage models. Thanks to the ease-of-use and robustness provided by the Ellisys Digital Radio, the BEX400 is the perfect system for these tasks. The analyzer can be controlled with a simple yet powerful Remote Control API (Application Programming Interface) to programmatically start / stop / save captures, and extract specific captured information that can be used for various purposes, including go/no-go testing , all without any manual operation. A unique segmentation feature works seamlessly with the API to allow for extremely long captures, segmenting captures into smaller more manageable slices while maintaining topology and contextual information from capture to capture. Software OverviewSee it in Action!Ellisys is participating in and sponsoring Bluetooth UnPlugFest events, and as such, provides equipment and expertise at every event to ensure participants have the right tools at the right time. UPFs are also a good opportunity to see our revolutionary whole-band Bluetooth Explorer and our other industry-leading analyzer and tester products in action. Feel free to register and attend our one-to-one training session and our public Debug in Action training. More |
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