By Kevin Townsend, Carles Cufí, Akiba, Robert Davidson
With Bluetooth Low strength (BLE), clever units are approximately to turn into even smarter. This functional consultant demonstrates how this intriguing instant expertise is helping builders construct cellular apps that proportion info with exterior undefined, and the way engineers can achieve effortless and trustworthy entry to cellular working systems.
This booklet offers a superior, high-level evaluate of the way units use BLE to speak with one another. You’ll examine valuable 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 systems for product designers and engineers.
know how facts is prepared and transferred by way of BLE devices
discover BLE’s recommendations, key boundaries, and community topology
Dig into the protocol stack to know how and why BLE operates
find out how BLE units realize one another and identify safe connections
arrange the instruments and infrastructure for BLE software development
Get examples for connecting BLE to iPhones, iPads, Android units, and sensors
strengthen code for an easy equipment that transmits middle price information to a cellular device
Read or Download Getting Started with Bluetooth Low Energy: Tools and Techniques for Low-Power Networking PDF
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Extra info for Getting Started with Bluetooth Low Energy: Tools and Techniques for Low-Power Networking
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.
Peripheral devices often come up from the factory in a discoverable mode before bond‐ ing with a central device, but then go into non-discoverable mode after the initial bond‐ ing procedure, allowing it to connect exclusively with that central device in the future. In this case, a reset to factory defaults usually brings it back into a discoverable mode. Discovery procedures The specification provides two discovery procedures: Limited discovery procedure A central performing this procedure starts active scanning with no white list fil‐ tering (see “White Lists” on page 23) for advertisers and analyzes each advertising packet that it receives.
Along with GAP, GATT is an upperlayer entity that acts as the main interface to a Bluetooth Low Energy protocol stack. Generic Access Profile (GAP) The Generic Access Profile (GAP) dictates how devices interact with each other at a lower level, outside of the actual protocol stack. GAP can be considered to define the BLE topmost control layer, given that it specifies how devices perform control proce‐ dures such as device discovery, connection, security establishment, and others to ensure interoperability and to allow data exchange to take place between devices from different vendors.