gatt

BLE temperature characteristic conversion

由 ▼魔方 西西 提交于 2021-02-11 13:58:48
问题 I have a BLE app running on nrf51822 on Zephyr. Application is reading data from humidity and temperature sensor and exposes environmental sensing characteristic. Main exposed value is temperature (uuid:2A6E). I have trouble reading this data via Bluez on linux. With nrfConnect app everything works no problem - I connect to the device and can see temperature reading - somewhere between 20 and 26 degrees (assigned to said uuid). Via Bluez I can connect and read characteristic handle but the

BLE temperature characteristic conversion

由 帅比萌擦擦* 提交于 2021-02-11 13:57:16
问题 I have a BLE app running on nrf51822 on Zephyr. Application is reading data from humidity and temperature sensor and exposes environmental sensing characteristic. Main exposed value is temperature (uuid:2A6E). I have trouble reading this data via Bluez on linux. With nrfConnect app everything works no problem - I connect to the device and can see temperature reading - somewhere between 20 and 26 degrees (assigned to said uuid). Via Bluez I can connect and read characteristic handle but the

Reading a gatt characteristic value in android studio notification

由 冷暖自知 提交于 2021-02-08 11:41:34
问题 I want to read a GATT characteristic value by the way of notification. This means I need to set that characteristic to notify and then read the data. I wish to do this in a function from an onclick. When I run my activity the characteristics are found and added to this arraylist private ArrayList<ArrayList<BluetoothGattCharacteristic>> mGattCharacteristics = new ArrayList<ArrayList<BluetoothGattCharacteristic>>(); I have the UUIDs of the service and characteristic values how do I get a

GATT profile and UART service

由 非 Y 不嫁゛ 提交于 2021-02-07 13:27:28
问题 I am new to developing a mobile app with bluetooth connection to peripheral device. I searched that GATT is the relevant profile used for bluetoothLE communication but our client recommended that we use UART service. Now I am confused as to 1. how these two things are related and 2. Do we have to opt for one of these, if so, what are the pros and cons of each. Thanks 回答1: Legacy Bluetooth provides the serial port profile (SPP) - This is essentially a serial input/output stream over Bluetooth.

GATT profile and UART service

由 霸气de小男生 提交于 2021-02-07 13:26:58
问题 I am new to developing a mobile app with bluetooth connection to peripheral device. I searched that GATT is the relevant profile used for bluetoothLE communication but our client recommended that we use UART service. Now I am confused as to 1. how these two things are related and 2. Do we have to opt for one of these, if so, what are the pros and cons of each. Thanks 回答1: Legacy Bluetooth provides the serial port profile (SPP) - This is essentially a serial input/output stream over Bluetooth.

通过 Web 控制蓝牙设备：WebBluetooth入门 [每日前端夜话0x27]

由 我们两清 提交于 2021-02-05 15:21:30
通过 Web 控制蓝牙设备：WebBluetooth入门 [每日前端夜话0x27] 京程一灯 前端先锋 每日前端夜话0x27 每日前端夜话，陪你聊前端。 每天晚上18:00准时推送。 正文共：5950 字 3 图 预计阅读时间： 15 分钟 翻译：疯狂的技术宅 原文： https://www .smashingmagazine.com/2019/02/introduction-to-webbluetooth/ 摘要 ：通过渐进式 Web 应用（Progressive Web Apps）技术，你可以开发成熟的 Web 应用。 得益于大量新规范和新功能，以前需要在本机执行的应用，现在可以基于 Web 实现。 不过迄今为止，与硬件设备的交互仍然是遥不可及。 感谢 WebBluetooth 的出现，现在我们可以开发能够控制灯光、驾驶汽车甚至是无人机的 PWA。 通过PWA技术，Web 应用越来越和本机应用相差无几。同时 Web 应用也有其额外的好处，比如隐私和跨平台兼容性。 传统的 Web 应用与网络上服务器的通信机制非常出色。现在 Web 正在向本机应用靠拢，所以我们还需要与本机应用相同的功能。 过去几年在浏览器中实现的新规范和功能的数量是惊人的。我们已经有了处理3D的规范，例如 WebGL 和即将推出的 WebGPU。我们可以通过流式传输并生成音频，来观看视频并将网络摄像头用作输入设备

connectGatt on Samsung Galaxy S7 creates connection over Bluetooth Classic instead of BLE

由 不羁岁月 提交于 2021-01-29 02:30:40
问题 I have a dual-mode (BR/EDR + BLE) device running a GATT server. The address is public and same for BLE and BD/EDR. When I call connectGatt on Galaxy S7 with Android 6.0.1 (API level 23) and set the transport parameter as "TRANSPORT_LE" the phone still tries to establish connection over BD/EDR. It looks like the problem is related to the public address of the BLE because if I set it to private the connection is done over BLE, as expected. This problem was observed only on Galaxy S7, on other

蓝牙协议分析(3)_BLE协议栈介绍

由 白昼怎懂夜的黑 提交于 2021-01-24 12:45:07
1. 前言 通过“ 蓝牙协议分析(2)_协议架构 ”的介绍，大家对蓝牙协议栈应该有了简单的了解，但是，肯定还有“似懂非懂、欲说还休”的感觉。有这种感觉太正常了，毕竟蓝牙协议是一个历史悠久又比较庞大的协议，没那么容易理解。 因此，本文将换个视角，从协议栈设计者的角度，思考如下问题： 为什么会有蓝牙协议栈（Why）？ 怎样实现蓝牙协议栈（How）？ 蓝牙协议栈的最终样子是什么（What）？ 另外，我们知道，当前的蓝牙协议包含BR/EDR、AMP、LE三种技术，为了降低复杂度，本文将focus在现在比较热门的BLE（Bluetooth Low Energy）技术上（物联网嘛！），至于BR/EDR和AMP，触类旁通即可。 2. Why “Why”要回答的其实是需求问题，对BLE（蓝牙低功耗）来说，其需求包含两个部分：和传统蓝牙重叠的部分；BLE特有的低功耗部分。大致总结如下： 基于2.4GHz ISM频段的无线通信； 通信速率要求不高，但对功耗极为敏感； 尽量复用已有的BR/EDR技术； 组网方式自由灵活，既可以使用传统蓝牙所使用的“基于连接的星形网络（由1个master和多个slave组成）”，也可以使用“无连接的网状网络（由多个advertiser和多个scanner组成）； 参与通信的设备的数量和种类众多，要从应用的角度考虑易于实现、互联互通等特性； 有强烈的安全（security

Android 蓝牙BLE开发详解

由 爱⌒轻易说出口 提交于 2020-10-29 04:59:02
有几篇不错的文章，在此记录一下 https://blog.csdn.net/Charon1997/article/details/72895734 Android BLE蓝牙4.0开发详解 https://blog.csdn.net/chenliqiang12345678/article/details/50504406 4.x开始的蓝牙我们称之为低功耗蓝牙也就是蓝牙ble 4.x开始的蓝牙我们称之为低功耗蓝牙也就是蓝牙ble，当然4.x版本的蓝牙也是向下兼容的。android手机必须系统版本4.3及以上才支持BLE API。低功耗蓝牙较传统蓝牙，传输速度更快，覆盖范围更广，安全性更高，延迟更短，耗电极低等等优点 BLE: 采用 gatt协议 传统蓝牙 采用socket 协议 来源： oschina 链接： https://my.oschina.net/u/141132/blog/1833269

Android Ble开发总结和遇到的坑

由 淺唱寂寞╮ 提交于 2020-09-27 23:52:05
一、前言 接触BLE开发也有一段时间了，一直想找个时间记录一下BLE开发中遇到的问题和和自己的一些理解， 硬件设备使用的都是低功耗蓝牙，讲真 BLE开发坑还是挺多的，废话不多说，进入正题。 二、注意事项： 1.判断是否支持BLE蓝牙、是否打开系统蓝牙 2.在一些高版本机型上， 用户还需打开位置信息(不光要位置权限，还需要打开位置信息)才能通过蓝牙进行扫描 。 3.开启搜索设备时要定时的主动停止搜索 ，不然时间久了会搜索不到设备。 4.在连接或通信过程中比如出现133、8、19、22、62等，马上调用 Gatt.disconnect(), Gatt.close() 。 三 、权限 < uses-permission android: name = " android.permission.BLUETOOTH " /> < uses-permission android: name = " android.permission.BLUETOOTH_ADMIN " /> < uses-permission android: name = " android.permission.ACCESS_COARSE_LOCATION " /> < uses-permission android: name = " android.permission.ACCESS_FINE_LOCATION "
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