Bluetooth battery status12/18/2023 However, when using Xamarin Forms, there is currently no fully supported API provided by Xamarin for cross-platform Bluetooth LE communication. When programming using Xamarin.Android & Xamarin.iOS, the developer has access to the native Bluetooth access methods, both of which (depending on the specific phones) gives the developer access to Bluetooth LE via the GATT protocol. For more details on BLE and how to deal with it in native Android, see. Software developers can access these specific addresses in their code to provide universal communication with devices. In this way, the manufacturer of a device must set up its device to have this service with these characteristics. Further to this, this service is configured with 3 characteristics for reading and writing various data points. For instance, the Heart Rate service is standardised to have a UUID of value 0x180D. On the firmware side, device manufacturers can specify where these characteristics point to.įor consistency, certain standards already exist for how Services and Characteristics should be set up for certain devices. In terms of communication, when reading and writing data on a BLE device, we directly address a specific characteristic. Both characteristics and services are identified via UUID’s. Services are typically used to logically break up characteristics by area. Any device can have several services configured under the GATT profile with each service being capable of having many characteristics defined. A characteristic can be thought of as a type, analogous to a class. A characteristic contains a single value and 0-n descriptors that describe the characteristic’s value. Using the GATT protocol, communication is achieved using a nested set of services and characteristics. For Bluetooth LE, all communication happens over the Generic Attribute Profile (GATT). What is an Example of This?įor example, a mobile phone may implement the A2DP protocol for streaming high-quality audio. As a result, typically these protocols will be configured on the device at the firmware level. These profiles are identified on the device by standard UUID’s. Once two devices are connected, they are free to communicate over a wide variety of communication profiles. Under the Bluetooth Specifications, devices broadcast their MAC address as a unique identifier. Therefore, this is now simpler as both the classic and LE protocols operate at the standard 2.4GHz frequency, meaning they can use the same antenna internally. Since about 2012 most mobile phone manufacturers have provided devices capable of both Bluetooth classic and Bluetooth LE communication. Bluetooth LE has been designed to consume considerably less power than the classic Bluetooth protocol. One of the largest factors in the prevalence of small Bluetooth enabled devices is the advent of the Bluetooth LE protocol. Just A Quick Mention of Bluetooth LE Protocol Some popular examples of these devices are Bluetooth headphones, health monitors, insulin pumps and even tracking devices. This allows users to control and interface with these peripherals via their phone. More and more we are seeing small low power devices being integrated with Bluetooth. Most of us are familiar with the Bluetooth communications protocol. While this problem may seem simple, for the uninitiated in Bluetooth technology and the nuances of its implementation within Xamarin, there are many factors which need to be addressed. It would be able to communicate over Bluetooth LE to another device. We planned to build a mobile app to target an Android device with a minimum OS version of 4.3 (API Level 18). Basically, nothing more than sending a few bytes of data between the phone and the remote device. The primary function of the mobile app was to communicate with a Bluetooth Low Energy (Bluetooth LE/BLE) device. Here at Enigma Mx, we were recently given the opportunity to work with a client on building a mobile application. How to integrate Bluetooth LE in Xamarin Forms The Xamarin Forms and Bluetooth LE Project Introduction:
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