android 低功耗蓝牙作为服务低功耗蓝牙uuid

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智能开发者 2023-07-29 18:09:04

文章标签 android 低功耗蓝牙作为服务蓝牙微信小程序 BLE 蓝牙模块 文章分类 Android 移动开发

1.准备

低功耗蓝牙模块：（链接）蓝牙模块购买通道相关参数数据（UUID表）：

android 低功耗蓝牙作为服务低功耗蓝牙uuid_蓝牙模块

需要知道服务ID(serviceID) ，响应特征值 ID（notify characteristic UUID），写特征值ID（write characteristic UUID），AT指令可不用管。

2.自动链接时的推荐流程图

借鉴大神的，我认为逻辑很清晰，所以引用在此。

android 低功耗蓝牙作为服务低功耗蓝牙uuid_android 低功耗蓝牙作为服务_02

本流程图是为了完成以后的特定模块的自动连接准备。现在只需要完成蓝牙（BLE）每一步的功能。

3.低功耗蓝牙步骤

1、开启蓝牙适配
（wx.openBluetoothAdapter(Object object)）
2、获取蓝牙适配器状态，判断设备蓝牙是否可用。
（wx.getBluetoothAdapterState(Object object)）
3、开启扫描蓝牙设备
（wx.startBluetoothDevicesDiscovery(Object object)）
4、获取蓝牙设备列表
（wx.getBluetoothDevices(Object object)）
5、连接某个已发现的设备
（wx.createBLEConnection(Object object)）
6、停止搜索蓝牙设备
（wx.stopBluetoothDevicesDiscovery(Object object)）
7、获取蓝牙设备服务
（wx.getBLEDeviceServices(Object object)）
8、获取服务下的所有特征值
（wx.getBLEDeviceCharacteristics(Object object)）
9、启用响应特征值变化
（wx.notifyBLECharacteristicValueChange(Object object)）
10、接收蓝牙的返回信息
（wx.onBLECharacteristicValueChange(function callback)）
11、发送信息
（wx.writeBLECharacteristicValue(Object object))）
12、断开蓝牙设备的连接
（wx.closeBLEConnection(Object object)）
上诉述蓝牙相关API 函数详情见微信官方开发文档：官方低功耗蓝牙接口API函数说明；

4.微信小程序源代码

1 .wxml文件：

<view class="contentview">
 
  <view  class='myview'>
    <text>
      {{info}}
    </text>
  </view>
 
  <button type="primary" class="button" bindtap="BLEInit">初始化蓝牙</button>
  <button type="primary" class="button" bindtap="BLEState">获取蓝牙状态</button>
  <button type="primary" class="button" bindtap="BLESearch">搜索设备</button>
  <button type="primary" class="button" bindtap="BLEGetDevices">获取所有设备</button>
  <block wx:for="{{devices}}" wx:key="{{test}}">
    <button type="primary" class="button" id="{{item.deviceId}}" style='background-color:red' 
    bindtap="BLEConnect">{{item.name}}</button>
  </block>
  <button type="primary" class="button" bindtap="BLESearchStop">停止搜索</button>
  <button type="primary" class="button" bindtap="BLEGetservice">获取service</button>
  <button type="primary" class="button" bindtap="BLEGetCharacteristics">获取Character</button>
  <button type="primary" class="button" bindtap="BLECharacteristicValueChange">启用特征值变化</button>
  <button type="primary" class="button" bindtap="BLEDataRecieve">接收蓝牙返回消息</button>
  <view class="section">
  <input placeholder='请输入要发送的信息' bindinput='getmsg'/>
  </view>
  <button type="primary" class="button" bindtap="BLEDataSend">微信发送消息</button>
  <button type="primary" class="button" bindtap="BLEDisconnect">12断开蓝牙设备</button>
</view>

2 .wxss文件：

.contentview {
margin: 0 10px;
}
 
.button {
margin: 5px;
}
 
.myview{
  height:200px;
  word-break:break-all;/* 自动换行 */
}

3 .js文件：

Page
({
  data: 
  {
    info:"",                //显示框
    devices:"",             //所有搜索到的蓝牙设备
    connectedDeviceId:"",   //连接上的设备的ID
    services: "" ,          //连接上设备的所有服务
    notifyCharacteristicsId: "0000FEE1-0000-1000-8000-00805F9B34FB", //响应UUID，根据蓝牙模块获得
    writeCharacteristicsId:  "0000FEE2-0000-1000-8000-00805F9B34FB", //写UUID， 根据蓝牙模块获得
  },
 
  
  /****************1.蓝牙初始化***************/
  BLEInit(event)
  {
      var that = this;
      wx.openBluetoothAdapter
      ({
          success: function (res) 
          {
            console.log('初始化蓝牙适配器成功')
            that.setData
            ({
              info: '初始化蓝牙适配器成功'
            })
          },
          fail: function (res) 
          {
            console.log('请打开蓝牙和定位功能')
            that.setData
            ({
              info: '请打开蓝牙和定位功能'
            })
          }
      })
  },


  /****************2.获取蓝牙状态***************/
  BLEState(event)
  {
    var that = this;
    wx.getBluetoothAdapterState
    ({
        success: function (res) 
        {
          //打印相关信息
          console.log(JSON.stringify(res.errMsg) + "\n蓝牙是否可用：" + res.available);

          that.setData
          ({
              info: JSON.stringify(res.errMsg) +"\n蓝牙是否可用：" + res.available
          })
        },

        fail: function (res) 
        {
          //打印相关信息
          console.log(JSON.stringify(res.errMsg) + "\n蓝牙是否可用：" + res.available);

          that.setData
          ({
              info: JSON.stringify(res.errMsg) + "\n蓝牙是否可用：" + res.available
          })
        }
    })
 
  },


  /****************3.搜索设备**************/
  BLESearch(event)
  {
    var that = this;
    wx.startBluetoothDevicesDiscovery
    ({
        services: ['0000FEE0-0000-1000-8000-00805F9B34FB'], //如果填写了此UUID，那么只会搜索出含有这个UUID的设备，建议一开始先不填写
        success: function (res) 
        {
          that.setData
          ({
              info: "搜索设备" + JSON.stringify(res),
          })

          console.log('搜索设备返回' + JSON.stringify(res))
        }
    })
  },


  /****************4.获取蓝牙设备***************/
  BLEGetDevices(event)
  {
    var that = this;
    wx.getBluetoothDevices
    ({
        success: function (res) 
        {
          that.setData
          ({
            info: "设备列表\n" + JSON.stringify(res.devices),
            devices: res.devices
          })

          console.log('搜设备数目：' + res.devices.length)
          console.log('设备信息：\n' + JSON.stringify(res.devices)+"\n")
        }
    })
  },


   /****************5.连接蓝牙设备***************/
  BLEConnect(event)
  {
    var that = this;
    wx.createBLEConnection
    ({
      deviceId: event.target.id,
      success: function (res) 
      {
        console.log('调试信息：' + res.errMsg);
        that.setData
        ({
          connectedDeviceId: event.currentTarget.id,
          info: "MAC地址：" + event.currentTarget.id  + '  调试信息：' + res.errMsg,
        })
      },
      fail: function () 
      {
        console.log("连接失败");
      },
    })
  },


  /****************6.停止搜索蓝牙设备***************/
  BLESearchStop(event)
  {
    var that = this;
    wx.stopBluetoothDevicesDiscovery
    ({
      success: function (res) 
      {
        console.log("停止搜索" + JSON.stringify(res.errMsg));
        that.setData
        ({
          info: "停止搜索"  + JSON.stringify(res.errMsg),
        })
      }
    })
  },


  /****************7.获取服务service***************/
  BLEGetservice(event)
  {
    var that = this;
    wx.getBLEDeviceServices
    ({
      // 这里的 deviceId 需要在上面的 getBluetoothDevices 或 onBluetoothDeviceFound 接口中获取
      deviceId: that.data.connectedDeviceId,

      success: function (res) 
      {
        console.log('services UUID:\n', JSON.stringify(res.services));
        for (var i = 0; i < res.services.length; i++) 
        {
          console.log("第"+(i+1) + "个UUID:" + res.services[i].uuid+"\n")
        }
        that.setData
        ({
          services: res.services,
          info: JSON.stringify(res.services),
        })
      }
    })
  },
 

  /****************8.获取所有的特征值***************/
  BLEGetCharacteristics(event)
  {
    var that = this;

    wx.getBLEDeviceCharacteristics
    ({
      // 这里的 deviceId 需要在上面的 getBluetoothDevices 中获取
      deviceId: that.data.connectedDeviceId,
      // 这里的 serviceId 需要在上面的 getBLEDeviceServices 接口中获取
      serviceId: that.data.services[0].uuid,

      success: function (res) 
      {
        console.log("%c getBLEDeviceCharacteristics", "color:red;");

        for (var i = 0; i < res.characteristics.length; i++) 
        {
          console.log('特征值：' + res.characteristics[i].uuid)
 
          if (res.characteristics[i].properties.notify) 
          {
              console.log("打印notifyCharacteristicsId")
              console.log(that.data.notifyCharacteristicsId)
          }

          if (res.characteristics[i].properties.write)
          {
              console.log("打印writeCharacteristicsId")
              console.log(that.data.writeCharacteristicsId)
          }
        }
        console.log('device getBLEDeviceCharacteristics:', JSON.stringify(res.characteristics));
      },

      fail: function () 
      {
        console.log("获取所有特征值失败");
      },
    })
  },


  /****************9.启用特征值变化***************/
  BLECharacteristicValueChange(event)
  {
    var that = this;

    console.log("启用的notifyCharacteristicsId", that.data.notifyCharacteristicsId);
 
    wx.notifyBLECharacteristicValueChange
    ({
      state: true,
      deviceId: that.data.connectedDeviceId,
      serviceId: that.data.services[0].uuid,
      characteristicId: that.data.notifyCharacteristicsId,

      success: function (res) 
      {
        console.log('notifyBLECharacteristicValueChange success', res.errMsg)
        var msg = '启动notify:' + res.errMsg
        that.setData({
          info: msg
        })
      },
      fail: function () 
      {
        console.log('启动notify:' + res.errMsg);
      },
      
    })
  },


  /****************10.接收蓝牙的返回数据***************/
  BLEDataRecieve(event)
  {
    var that = this;
    console.log("开始接收数据");

    wx.onBLECharacteristicValueChange
    (
      function (res) 
      {
        console.log("characteristicId：" + res.characteristicId)
        console.log("serviceId:" + res.serviceId)
        console.log("deviceId" + res.deviceId)
        console.log("Length:" + res.value.byteLength)
        console.log("hexvalue:" + ab2hex(res.value))
        that.setData
        ({
          info: that.data.info + ab2hex(res.value)
        })
      }
    )
  },

/****************11.蓝牙发送数据***************/
  BLEDataSend(event)
  {
    var that = this
    var hex = that.data.sendmsg  //要发送的信息

    console.log('要发送的信息是：'+hex)

    var typedArray = new Uint8Array(hex.match(/[\da-f]{2}/gi).map(function (h) {
      return parseInt(h, 16)
    }))

    console.log(typedArray)

    var buffer1 = typedArray.buffer

    wx.writeBLECharacteristicValue
    ({
      deviceId: that.data.connectedDeviceId,
      serviceId: that.data.services[0].uuid,
      characteristicId: that.data.writeCharacteristicsId,

      // 这里的value是ArrayBuffer类型
      value: buffer1,

      success: function (res) 
      {
        console.log('写入成功', res.errMsg)
      },
      fail(res)
      {
        console.log('写入失败', res.errMsg)
      }
    })
  },
 
  /****************12.断开蓝牙的连接***************/
  BLEDisconnect(event)
  {
    var that = this;
    wx.closeBLEConnection
    ({
        deviceId: that.data.connectedDeviceId,
        success: function (res) 
        {
          that.setData
          ({
            connectedDeviceId: "",
          })
          console.log('断开蓝牙设备成功：' + res.errMsg)
        },
        fail:function(res)
        {
          console.log('断开蓝牙设备失败：' + res.errMsg)
        }
    })
  },


  //获取输入框的数据
  getmsg(event){
    this.setData({
      sendmsg:event.detail.value
    })
    
  },
 
})


// ArrayBuffer转16进度字符串示例
function ab2hex(buffer) {
  var hexArr = Array.prototype.map.call(
    new Uint8Array(buffer),
    function (bit) {
      return ('00' + bit.toString(16)).slice(-2)
    }
  )
  return hexArr.join(',');
}