Getting Started with Bluetooth Low Energy: Tools and by Kevin Townsend, Carles Cufí, Akiba, Robert Davidson

By Kevin Townsend, Carles Cufí, Akiba, Robert Davidson

With Bluetooth Low strength (BLE), shrewdpermanent units are approximately to develop into even smarter. This functional consultant demonstrates how this intriguing instant expertise is helping builders construct cellular apps that percentage info with exterior undefined, and the way engineers can achieve effortless and trustworthy entry to cellular working systems.

This publication offers a superb, high-level evaluation of ways units use BLE to speak with one another. You’ll examine worthwhile inexpensive instruments for constructing and trying out BLE-enabled cellular apps and embedded firmware and get examples utilizing numerous improvement platforms—including iOS and Android for app builders and embedded structures for product designers and engineers.

know how info is prepared and transferred through BLE devices
discover BLE’s innovations, key boundaries, and community topology
Dig into the protocol stack to understand how and why BLE operates
learn the way BLE units observe one another and determine safe connections
manage the instruments and infrastructure for BLE software development
Get examples for connecting BLE to iPhones, iPads, Android units, and sensors
boost code for an easy equipment that transmits center fee information to a cellular device

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Additional info for Getting Started with Bluetooth Low Energy: Tools and Techniques for Low-Power Networking

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Procedures and their required modes Procedure Applicable Role(s) Applicable Peer Mode(s) Observation Observer Broadcast Limited discovery Central Limited discoverable General discovery Central Limited and General discoverable Name discovery Peripheral, central N/A Any connection establishment Central Any connectable Connection parameter update Peripheral, central N/A Terminate connection N/A Peripheral, central Chapter 1 and Chapter 2 introduced the basic concepts of over-the-air data exchange in BLE, but it is worth reviewing them briefly here.

Each connection starts its lifetime in security mode 1, level 1, and can later be upgraded to any of the security modes by means of encryption or data signing. It is important to know that a link can be downgraded from mode 1, level 3, to mode 1, level 2 by switching encryption keys, but encryption can never be disabled in the lower layers, making it impossible to go down from security mode 1, level 2. Security Modes and Procedures Along with all the modes and procedures detailed in previous sections, GAP also defines additional ones related to security establishment and enforcement.

Undirected connectable mode A device in this mode sends ADV_IND advertising packets (see Table 2-1). This is the standard connectable mode, through which a peripheral makes itself connectable for a longer period of time and may be trying to connect to a new central or to one that is already previously known by it. Both connectable modes implicity require the device to send the advertising packets with the intent to connect to a central. Connection establishment procedures Because a central device has no means to select which advertising packet types it will receive when scanning with the intent to connect (they will always be of type ADV_IND or ADV_DIRECT_IND), the distinctions between connection establishment procedures do Modes and Procedures | 41 not depend on types of advertising packets.

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