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 sensible consultant demonstrates how this intriguing instant know-how is helping builders construct cellular apps that percentage facts with exterior undefined, and the way engineers can achieve effortless and trustworthy entry to cellular working systems.

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

know the way facts is prepared and transferred by means of BLE devices
discover BLE’s ideas, key obstacles, and community topology
Dig into the protocol stack to know how and why BLE operates
find out how BLE units notice one another and identify safe connections
organize the instruments and infrastructure for BLE software development
Get examples for connecting BLE to iPhones, iPads, Android units, and sensors
enhance code for an easy gadget that transmits center cost facts to a cellular device

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

Sample text

The first method requires two steps: first scanning and then connecting directly to a device (by specifying its Bluetooth Address) detected during the scanning phase. The second method skips the explicit scanning step and instead uses the controller to select one or more devices to connect to, without previous knowledge of whether they are actually nearby. Additional GAP Procedures GAP defines a few other procedures that are relevant only to already established con‐ nections, and which are commonly used: 42 | Chapter 3: GAP (Advertising and Connections) Name discovery procedure Advertising packets can carry many different types of user data, including the Device Name: a UTF-8 string containing a human-readable description of the device (sim‐ ilar to a network hostname).

Link Layer | 19 Figure 2-3. Advertising and scanning The scan interval and scan window parameters define how often and for how long a scanner device will listen for potential advertising packets. As with the advertising in‐ terval, those values have a deep impact on power consumption, since they directly relate to the amount of time the radio must be turned on. The specification defines two basic types of scanning procedures: Passive scanning The scanner simply listens for advertising packets, and the advertiser is never aware of the fact that one or more packets were actually received by a scanner.

The advertiser receives it and responds with a Scan Response packet. This additional packet doubles the effective payload that the advertiser is able to send to the scanner, but it is important to note that this does not provide a means for the scanner to send any user data at all to the advertiser. Figure 2-4 illustrates the difference between passive and active scanning. 20 | Chapter 2: Protocol Basics Figure 2-4. Active and passive scanning Advertising packet types can be classified according to three different properties.

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