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 power (BLE), clever units are approximately to turn into even smarter. This sensible advisor demonstrates how this intriguing instant expertise 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 an excellent, high-level evaluation of the way units use BLE to speak with one another. You’ll study invaluable reasonably cheap 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 systems for product designers and engineers.

know the way information is geared up and transferred by way of BLE devices
discover BLE’s innovations, key obstacles, and community topology
Dig into the protocol stack to understand how and why BLE operates
find out how BLE units detect one another and determine safe connections
manage the instruments and infrastructure for BLE program development
Get examples for connecting BLE to iPhones, iPads, Android units, and sensors
increase code for an easy gadget that transmits middle cost info to a cellular device

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

Example text

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.

On the reception path, it receives multiple packets that have been fragmented and recombines them into a single large packet that will then be sent upstream to the appropriate entity in the upper layers of the host. To draw a simple comparison, L2CAP is similar to TCP, in that it allows a wide range of protocols to seamlessly coexist through a single physical link, each with a different packet size and requirements. For Bluetooth Low Energy, the L2CAP layer is in charge or routing two main protocols: the Attribute Protocol (ATT) and the Security Manager Protocol (SMP).

Write Command Write to the value of an attribute without any response or acknowledgement. This operation does not follow the request/response sequencing and can be sent at any time. Signed Write Command Similar to Write Command, but using a signature as described in “Security Manager (SM)” on page 28. This operation does not follow the request/response sequencing and can be sent at any time. Queued Writes Used by the client to write to attribute values that are longer than what can fit in a single packet, they include: Prepare Write Request/Response Queue a write operation in the server for a particular handle, after which the successful queuing is acknowledged by the server.

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