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

By Kevin Townsend, Carles Cufí, Akiba, Robert Davidson

With Bluetooth Low power (BLE), clever units are approximately to turn into even smarter. This useful consultant demonstrates how this interesting instant know-how is helping builders construct cellular apps that proportion information with exterior undefined, and the way engineers can achieve effortless and trustworthy entry to cellular working systems.

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

know the way facts is geared up and transferred through BLE devices
discover BLE’s strategies, key boundaries, and community topology
Dig into the protocol stack to understand how and why BLE operates
learn the way BLE units become aware of one another and identify safe connections
organize the instruments and infrastructure for BLE program development
Get examples for connecting BLE to iPhones, iPads, Android units, and sensors
advance code for an easy equipment that transmits center expense facts to a cellular device

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Extra resources for Getting Started with Bluetooth Low Energy: Tools and Techniques for Low-Power Networking

Sample text

This is in marked contrast to a peripheral, which stops advertising itself after establishing a connection, effectively shutting itself off to any other central devices in listening range until the connection is closed or, in the rare case of devices that support multiple connections as a slave, until an additional connection is created. For example, Apple’s iBeacon (“iBeacon” on page 132) uses the broadcast mode to con‐ stantly send out a specific payload in the Manufacturer Specific Data field of the ad‐ vertising data, which allows any device that comes within earshot of the node to detect the iBeacon without having to compete for access with other devices in range.

But space in the advertising packet is at a premium, so sometimes devices might not choose to include the Device Name. For such cases, the name discovery procedure allows a peripheral or central to retrieve the Device Name over an established connection by using a GATT transaction. Connection parameter update procedure Each connection establishment requires a set of connection parameters that are set unilaterally by the central. These parameters are the key factors in the balance be‐ tween throughput and power consumption for a connection (as described in “Con‐ nections” on page 22) and can be modified later in a connection to adapt to changing balance requirements.

But space in the advertising packet is at a premium, so sometimes devices might not choose to include the Device Name. For such cases, the name discovery procedure allows a peripheral or central to retrieve the Device Name over an established connection by using a GATT transaction. Connection parameter update procedure Each connection establishment requires a set of connection parameters that are set unilaterally by the central. These parameters are the key factors in the balance be‐ tween throughput and power consumption for a connection (as described in “Con‐ nections” on page 22) and can be modified later in a connection to adapt to changing balance requirements.

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