微信小程序蓝牙连接硬件设备并进行通讯,小程序蓝牙因距离异常断开自动重连,js实现crc校验位
Posted 苦海123
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了微信小程序蓝牙连接硬件设备并进行通讯,小程序蓝牙因距离异常断开自动重连,js实现crc校验位相关的知识,希望对你有一定的参考价值。
一、小程序实现搜索蓝牙:
注意:comtl是我封装的工具函数,无关紧要,实际项目中可能用不到:
const comtl = require('../../utils/commontool')
const app = getApp() // 拿到全局定义的变量,需要在app.js中:App(globalData: params: ''),params为全局变量名
let timerid = 0 // 定时器id
Page(
data:
datas:[], // 所有蓝牙数据
deviceId:'', // 蓝牙设备 id
bluename:'', // 蓝牙设备 name
serviceuuid:'', // 选中蓝牙设备的服务uuid截取字符串
serviceId:'', // 服务id ,uuid
characteristicNotifyId:'', // 读数据的特征值id
characteristicWriteId:'', // 写数据的特征值id
timerStat:true
,
searchDevice: function() // 蓝牙初始化
clearInterval(timerid)
wx.vibrateShort()
let _this = this
let arr = []
this.setData(
datas:arr
)
wx.openBluetoothAdapter(
success: function(res)
_this.getBluetoothState()
,
fail: function(res)
comtl.toast('蓝牙初始化失败','error',2000)
)
,
getBluetoothState: function() // 获取本地蓝牙适配器状态
let _this = this
wx.getBluetoothAdapterState(
success: function(res)
_this.findBleDevices()
,
fail: function(e)
comtl.toast('获取本机蓝牙适配器状态失败','error',2000)
)
,
findBleDevices: function() // 搜索蓝牙
comtl.openloading('搜索蓝牙...',false)
let _this = this
wx.startBluetoothDevicesDiscovery(
success: function(res)
_this.onBluetoothDeviceFound()
,
fail: function(res)
comtl.toast('搜索蓝牙失败','error',2000)
)
,
onBluetoothDeviceFound: function() // 监听搜索到新设备的事件
let _this = this
wx.onBluetoothDeviceFound(function(res)
_this.getBluetoothDevices()
)
,
getBluetoothDevices: function()
let _this = this
wx.getBluetoothDevices( //获取在蓝牙模块生效期间所有搜索到的蓝牙设备,包括已经和本机处于连接状态的设备
success: function(res)
_this.setData(
datas:res.devices
)
,
fail: function(res)
comtl.toast('获取蓝牙设备失败','error',2000)
)
,
clickBlueToolHandle: function(e)
wx.vibrateShort()
let _this = this
wx.closeBLEConnection( // 断开与蓝牙低功耗设备的连接
deviceId:_this.data.deviceId
)
wx.stopBluetoothDevicesDiscovery() //停止搜寻附近的蓝牙外围设备
if(e)
let deviceId = e.currentTarget.dataset.deid;
let bluename = e.currentTarget.dataset.bluename;
let serviceuuid = e.currentTarget.dataset.serviceuuid;
this.setData(
deviceId:deviceId,
bluename:bluename,
serviceuuid:serviceuuid
)
//蓝牙连接
wx.createBLEConnection( // 连接与蓝牙低功耗设备的连接
deviceId: _this.data.deviceId,
timeout:5000,
success: function(res)
clearInterval(timerid)
_this.stopBluetooth() //停止搜索
_this.monitorIsBreak();
_this.getBLEDeviceServices(); //获取服务
,
fail: function(res)
wx.hideLoading()
comtl.toast('连接低功耗蓝牙失败','error',2000)
,
complete: function ()
comtl.toast('不支持','error',2000)
)
,
monitorIsBreak() // 监听异常断开
let _this = this
wx.onBLEConnectionStateChange(function(res)
if(!res.connected) // 判断是否为断开连接
_this.timerConnect()// 开启定时器
wx.vibrateLong()
comtl.toast('蓝牙已断开','error',5000)
_this.setData(
timerStat:false
)
else
_this.setData(
timerStat:true
)
)
,
stopBluetooth() //停止蓝牙搜索
wx.stopBluetoothDevicesDiscovery(
success: function(res)
comtl.closeloading() // 关闭停止搜索遮挡层
comtl.toast('停止蓝牙搜索','success',2000)
,
fail: function(res)
comtl.toast('停止蓝牙搜索失败','error',2000)
)
,
getBLEDeviceServices: function() //获取蓝牙低功耗设备所有服务uuid
let services = [];
let _this = this;
wx.getBLEDeviceServices(
deviceId: _this.data.deviceId,
success: function(res)
services = res.services
if (services.length <= 0)
comtl.toast('没有服务','error',2000)
return
//循环获取serviceId
for (let x in services) //x = index
if (services[x].uuid.indexOf(_this.data.serviceuuid) >= 0)
//找到有效的UUID
_this.setData(
serviceId:services[x].uuid
)
_this.getBLEDeviceCharacteristics()
break
,
fail: function(res)
comtl.toast('获取设备服务失败','error',2000)
)
,
getBLEDeviceCharacteristics: function() //获取蓝牙低功耗设备某个服务中所有特征
let charactArray = [];
let _this = this;
wx.getBLEDeviceCharacteristics(
deviceId: this.data.deviceId,
serviceId: this.data.serviceId, // 这个是上面那个UUID
success: function(res)
charactArray = res.characteristics;
if (charactArray.length <= 0)
comtl.toast('获取特征值失败','error',2000)
return
//charactArray 也就是 res.characteristics 这个里面有能读数据的 能写数据的 要分着用
for (var x in charactArray)
//写数据
if (charactArray[x].properties.write)
_this.setData(
characteristicWriteId:charactArray[x].uuid
)
//读数据
if (charactArray[x].properties.notify)
_this.setData(
characteristicNotifyId:charactArray[x].uuid
)
app.params = _this.data
wx.switchTab(
url: '../home/home'
)
,
fail: function(res)
comtl.toast('蓝牙不支持','error',2000)
)
,
onShareAppMessage: function(res)
return
title: 'F3000X',
path: 'pages/searchbuletool/searchbuletool',
success: function(res)
,
onShow()
clearInterval(timerid)
,
timerConnect() //定时器自动重新连接(因距离导致断开重新连接)
let _this = this
if (_this.data.timerStat)
timerid = setInterval(()=>
_this.clickBlueToolHandle()
,5000)
)
二、连接某蓝牙设备
将datas:[]中的蓝牙数据遍历渲染到某个wxml页面上,点击某个设备的数据即可连接,需要注意的是,你自己的小程序需要支持某蓝牙设备,不然即使连接上蓝牙也无法操作设备,如:
const comtl = require('../../utils/commontool')
const app = getApp()
let dataString = ''
Page(
data:
datas:[], // 所有蓝牙数据
deviceId:'', // 蓝牙设备 id
bluename:'', // 蓝牙设备 name
serviceuuid:'', // 选中蓝牙设备的服务uuid截取字符串
serviceId:'', // 服务id ,uuid
characteristicNotifyId:'', // 读数据的特征值id
characteristicWriteId:'', // 写数据的特征值id
domdatas:, // 页面数值数据
domunit:, // 页面单位数据
transdat:'', //转换后的值
transdat1:'', //转换后的值
transdat2:'', //转换后的值
timerId:0, // 定时器id
isGoRest:false
,
onLoad()
let isExist = wx.getStorageSync('history')
if(isExist === '' || isExist === undefined)
wx.setStorageSync('history',[])
,
redatat: function(dt) // 读数据开始
if(dt.BtchFlowCount)
this.setData(
domdatas:dt,
transdat: this.filter(this.data.domdatas.ReadyConst,this.data.domunit.dotted),
transdat1: this.filter(this.data.domdatas.MinutFlowCount,this.data.domunit.dotted),
transdat2: this.filter(this.data.domdatas.BtchFlowCount,this.data.domunit.dotted)
)
else if(dt.dotted)
this.setData(
domunit:dt
)
let _this = this
wx.notifyBLECharacteristicValueChange(
deviceId: this.data.deviceId,
serviceId: this.data.serviceId,
characteristicId: this.data.characteristicNotifyId,
state: true,
success: function(res)
_this.onBLECharacteristicValueChange();
)
dataString = ''
,
onBLECharacteristicValueChange: function() // 监听蓝牙特征值变化
wx.onBLECharacteristicValueChange(function(res)
dataString += comtl.ab2hex(res.value)
)
,
writedata: function(hex) // 写数据
wx.writeBLECharacteristicValue(
deviceId: this.data.deviceId,
serviceId: this.data.serviceId,
characteristicId: this.data.characteristicWriteId,
value: comtl.str2ab(hex),
success: function(res) ,
fail: function(res)
)
,
startTimer() // 定时获取数据:
let ids = setInterval(()=>
this.readUnit()
,100)
setTimeout(()=>
clearInterval(ids)
,800)
let timerid = setInterval(()=>
this.readData()
,1000)
this.setData(
timerId:timerid
)
,
readData() // 读数值数据:
let domdat = comtl.transformData(dataString)
this.redatat(domdat)
this.writedata('01030001001E9402')
,
readUnit() // 读单位:
let domdat = comtl.transformUnit(dataString)
this.redatat(domdat)
this.writedata('01035003000624C8')
,
starttap()
wx.vibrateShort()
this.writedata('011020070001020014862A')
setTimeout(()=>
if(this以上是关于微信小程序蓝牙连接硬件设备并进行通讯,小程序蓝牙因距离异常断开自动重连,js实现crc校验位的主要内容,如果未能解决你的问题,请参考以下文章
微信小程序控制硬件第17篇 : 腾讯连连小程序通过LLSync蓝牙协议控制安信可PB-02模组,无需网络实现蓝牙本地通讯。(附带源码)
微信小程序控制硬件第17篇 : 腾讯连连小程序通过LLSync蓝牙协议控制安信可PB-02模组,无需网络实现蓝牙本地通讯。(附带源码)
微信小程序控制硬件第17篇 : 腾讯连连小程序通过LLSync蓝牙协议控制安信可PB-02模组,无需网络实现蓝牙本地通讯。(附带源码)