微信小程序Ble设备连接与发送

闲来没事钻研小程序开发，写了一篇关于微信小程序ble设备控制的底层api，话不多说直接上源码：

目录结构：

baseBleApi.js文件：

var currentDevice = {}; //ble设备

var notifyService = {}; //唤醒特征值

var writeService = {}; //写入服务

var writeCharacteristic = {}; //写入特征值

var notifyCharacteristic = {}; //唤醒特征值

var onSendSuccessCallBack = undefined; //成功回调

var onConnectCallback = undefined; // 链接回调

var bleUtils = require( 'utils/strUtils.js');

var crc = require( 'crc.js');

var isConnected = false; //是否已链接

module.exports = {

writeCommend: writeCommend,

closeBLEConnection: closeBLEConnection

// disConnect, disConnect,

// openBluetoothAdapter: openBluetoothAdapter

}

/**

* @param sendCommend 写入命令

* @param deviceName 锁具名称

* @param onSuccessCallBack 成功回调

* @param onFailCallBack 返回失败回调

* @param onCompleteCallBack 成功失败都会回调

*

* @param services 主服务serviceUUID

* @param writeServiceUUID 写入服务UUID

* @param notifyServiceUUID 唤醒服务UUID

*

* @param notifyCharacteristicUUID 唤醒特征值UUID

* @param writeCharacteristicUUID 写入特征值UUID

*/

function writeCommend(options) {

var params = {};

var defalt = {

adviceId: "",

sendCommend: "",

onSuccessCallBack: function success(res) { },

onFailCallBack: function success(res) { },

onCompleteCallBack: function success(res) { },

services: [],

writeServiceUUID: "",

notifyServiceUUID: "",

notifyCharacteristicUUID: "",

writeCharacteristicUUID: ""

};

params = Object.assign(defalt, options)

// setConnectionStateChange(params.onFailCallBack)

if (!setConnectionStateChange()) {

openBluetoothAdapter(params);

} else {

// typeof str == 'string'

sendCmd(params.sendCommend, params.onSuccessCallBack, params.onFailCallBack);

}

}

/**

* 初始化蓝牙适配器

*/

function openBluetoothAdapter(params) {

wx.openBluetoothAdapter({

success: function (res) {

console.log( "初始化蓝牙适配器成功")

console.log(res)

startBluetoothDevicesDiscovery(params)

}, fail: function (res) {

console.log( "初始化蓝牙适配器失败")

params.onFailCallBack(res.errMsg)

console.log(res);

return

},

complete: function (res) {

console.log(res);

}

})

}

/**

* 开始搜寻附近的蓝牙外围设备。注意，该操作比较耗费系统资源，请在搜索并连接到设备后调用 stop 方法停止搜索。

* @ params services:['4asdga'],根据主ServiceUUID进行搜索特定蓝牙，提高搜索效率

* 本ble设备主ServiceUUid: "6E400001-B5A3-F393-E0A9-E50E24DCCA9E"

*/

var delayTimer; //停止循环获取tag

var isFound = false

function startBluetoothDevicesDiscovery(params, connectCallback) {

if ( typeof connectCallback == 'undefined') {

connectCallback = function (errMsg) { }

}

onConnectCallback = connectCallback;

setTimeout( function () {

if (isFound) {

return;

}

else {

console.log( "搜索设备超时");

params.onFailCallBack( "搜索设备超时")

stopBluetoothDevicesDiscovery();

clearInterval(delayTimer)

return

}

}, 10000);

wx.startBluetoothDevicesDiscovery({

services: params.services,

success: function (res) {

console.log(res)

console.log( "开启搜索成功")

getBluetoothDevices(params)

}, fail: function (res) {

console.log( "开启搜索失败")

console.log(res)

params.onFailCallBack(res)

return

},

complete: function (res) {

// complete

console.log(res);

}

})

//每隔一秒获取一次

delayTimer = setInterval( function () {

getBluetoothDevices(params)

}, 1000)

}

/**

* 获取所有已发现的蓝牙设备，包括已经和本机处于连接状态的设备

*/

function getBluetoothDevices(params) {

wx.getBluetoothDevices({

success: function (res) {

console.log( "getBluetoothDevices");

console.log(res.devices);

for ( var i = 0; i < res.devices.length; i++) {

//忽略传入的deviceName大小写

// isContains bleUtils

var lockNameFinal = bleUtils.removeBytes(params.adviceId, ":")

if (bleUtils.isContains(res.devices[i].name, lockNameFinal)) {

console.log( "搜索到要链接的设备....")

stopBluetoothDevicesDiscovery();

isFound = true

clearInterval(delayTimer)

currentDevice = res.devices[i]

createBLEConnection(params)

}

}

},

fail: function (res) {

clearInterval(delayTimer)

console.log( "没有搜索到要链接的设备....")

console.log(res)

params.onFailCallBack(res)

stopBluetoothDevicesDiscovery();

return

}

})

}

/**

* 停止搜寻附近的蓝牙外围设备。请在确保找到需要连接的设备后调用该方法停止搜索。

*/

function stopBluetoothDevicesDiscovery() {

wx.stopBluetoothDevicesDiscovery({

success: function (res) {

console.log(res)

}

})

}

/**

* 连接低功耗蓝牙设备

*/

function createBLEConnection(params) {

// setConnectionStateChange(params.onFailCallBack);

setTimeout( function () {

if (isConnected) return;

console.log( "连接设备超时");

params.onFailCallBack( "连接设备超时")

return

}, 5000)

wx.createBLEConnection({

// 这里的 deviceId 需要在上面的 getBluetoothDevices 或 onBluetoothDeviceFound 接口中获取

deviceId: currentDevice.deviceId + "",

success: function (res) {

console.log(res)

console.log( `连接成功 : ${ currentDevice.deviceId }`)

isConnected = true

getBLEDeviceServices(params);

}, fail: function (res) {

console.log(res)

params.onFailCallBack(res)

console.log( `连接失败 : ${ currentDevice.deviceId }`)

}

})

}

/**

* closeBLEConnection

* 断开与低功耗蓝牙设备的连接