2021-02-25(uni-app蓝牙开锁篇)

此文章参考他人的文章:https://www.jianshu.com/p/841fcae155fc

蓝牙整个步骤:1初始化蓝牙,2开始搜寻附近的蓝牙外围设备,3监听寻找到新设备的事件,4搜寻到需要的蓝牙,停止搜寻附近的蓝牙外围设备,5连接低功耗蓝牙设备,6获取蓝牙设备所有服务(service),7获取蓝牙设备某个服务中所有特征值(characteristic),8启用低功耗蓝牙设备特征值变化时的 notify 功能,订阅特征值。注意:必须设备的特征值支持 notify 或者 indicate 才可以成功调用,9向低功耗蓝牙设备特征值中写入二进制数据。

uni.openBluetoothAdapter({

  //首先初始化蓝牙

  success(res) {

    console.log(JSON.stringify(res))

    uni.startBluetoothDevicesDiscovery({

      //这里是开启蓝牙搜寻

      success: res => {

        console.log('startBluetoothDevicesDiscovery success', res)

        uni.onBluetoothDeviceFound(res => {

          //这一步是监听返回的蓝牙设备

          console.log(JSON.stringify(res))

          res.devices.forEach(device => {

            //这一步就是去筛选找到的蓝牙中,有没有你匹配的名称

            console.log(JSON.stringify(device))

            if (device.name == 'XiaoanTech') {

              this.DeviceID = device.deviceId

              let DeviceID = device.deviceId //这里是拿到的uuid

              uni.stopBluetoothDevicesDiscovery({

                //当找到匹配的蓝牙后就关掉蓝牙搜寻,因为蓝牙搜寻很耗性能

                success(res) {

                  console.log(JSON.stringify(res))

                }

              })

              console.log(DeviceID)

              uni.createBLEConnection({

                //连接低功耗蓝牙设备

                deviceId: DeviceID, //传入刚刚获取的uuid

                success(res) {

                  console.log(JSON.stringify(res))

                  //uni.getConnectedBluetoothDevices({

                  //success(res) {

                  //console.log(JSON.stringify(res))

                  //}

                  //})

                  setTimeout(function() {

                    //这里为什么要用setTimeout呢,等等下面会解释

                    uni.getBLEDeviceServices({

                      //获取蓝牙设备所有服务

                      deviceId: DeviceID,

                      success(res) {

                        //为什么要用延时,因为不用延时就拿不到所有的服务,在上一步,连接低功耗蓝牙

                        //设备的时候,需要一个600-1000毫秒的时间后,再去获取设备所有服务,不给延时就会一直返回错误码10004

                        console.log(JSON.stringify(res))

                        uni.getBLEDeviceCharacteristics({

                          //获取蓝牙设备某个服务中所有特征值

                          deviceId: DeviceID,

                          serviceId: this.ServiceUUID, //这个serviceId可以在上一步获取中拿到,也可以在

                          //蓝牙文档中(硬件的蓝牙文档)拿到,我这里是通过文档直接赋值上去的,一般有两个,一个是收的uuid,一个是发的uuid,我们这边是发

                          success(res) {

                            console.log(JSON.stringify(res))

                            uni.notifyBLECharacteristicValueChange({

                              state: true, // 启用 notify 功能

                              // 这里的 deviceId 需要已经通过 createBLEConnection 与对应设备建立链接

                              deviceId: DeviceID,

                              // 这里的 serviceId 需要在 getBLEDeviceServices 接口中获取

                              serviceId: this.ServiceUUID,

                              // 这里的 characteristicId 需要在 getBLEDeviceCharacteristics 接口中获取

                              characteristicId: self.characteristicId,

                              success(res) {

                                console.log(

                                  'notifyBLECharacteristicValueChange success',

                                  res.errMsg

                                )

                                uni.showToast({

                                  title: '开启蓝牙连接',

                                  duration: 2000

                                })

                              },

                              fail(res) {

                                console.log(JSON.stringify(res))

                              }

                            })

                          },

                          fail(res) {

                            console.log(JSON.stringify(res))

                          }

                        })

                      },

                      fail(res) {

                        console.log(JSON.stringify(res))

                      }

                    })

                  }, 1000)

                },

                fail(res) {

                  console.log(res)

                }

              })

            }

          })

        })

      }

    })

  },

  fail(res) {

    console.log(res)

    if (res.errCode == 10001) {

      uni.showToast({

        title: '蓝牙未打开',

        duration: 2000

      })

    } else {

      uni.showToast({

        title: res.errMsg,

        duration: 2000

      })

    }

  }

})

蓝牙连接成功后就是发送指令了,发送二进制数据

    SendChange(){

      //开锁

      var self = this

      // 向蓝牙设备发送一个0x00的16进制数据

      let buffer = new ArrayBuffer(8)

      let dataView = new DataView(buffer)

      dataView.setUint8(0, 0x20) //开锁指令

      dataView.setUint8(1, 0x05) //字节

      dataView.setUint8(2, 0x0a) //指令

      dataView.setUint8(3, 0x0a) //指令

      dataView.setUint8(4, 0x05) //指令

      dataView.setUint8(5, 0x05) //指令

      dataView.setUint8(6, 0x00) //指令

      //算法,逢10进1,A到F(或a~f)表示,其中:A~F表示10~15

      //20等于32,32+05+10+10+5+5+0 = 67

      dataView.setUint8(7, 0x43)

      uni.writeBLECharacteristicValue({

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

        deviceId: self.DeviceID,

        // 这里的 serviceId 需要在 getBLEDeviceServices 接口中获取

        serviceId: self.ServiceUUID,

        // 这里的 characteristicId 需要在 getBLEDeviceCharacteristics 接口中获取

        characteristicId: self.characteristicId,

        // 这里的value是ArrayBuffer类型

        value: buffer,

        success(res) {

          console.log('writeBLECharacteristicValue success', res.errMsg)

          uni.showToast({

            title: '开锁',

            duration: 2000

          })

        },

        fail(res) {

          console.log(JSON.stringify(res))

          console.log(JSON.stringify(buffer))

        }

      })

    },

    CloseChange: function() {

      //关锁

      var self = this

      // 向蓝牙设备发送一个0x00的16进制数据

      let buffer = new ArrayBuffer(8)

      let dataView = new DataView(buffer)

      dataView.setUint8(0, 0x20)

      dataView.setUint8(1, 0x05)

      dataView.setUint8(2, 0x0a)

      dataView.setUint8(3, 0x0a)

      dataView.setUint8(4, 0x05)

      dataView.setUint8(5, 0x05)

      dataView.setUint8(6, 0x01)

      dataView.setUint8(7, 0x44)

      uni.writeBLECharacteristicValue({

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

        deviceId: self.DeviceID,

        // 这里的 serviceId 需要在 getBLEDeviceServices 接口中获取

        serviceId: self.ServiceUUID,

        // 这里的 characteristicId 需要在 getBLEDeviceCharacteristics 接口中获取

        characteristicId: self.characteristicId,

        // 这里的value是ArrayBuffer类型

        value: buffer,

        success(res) {

          console.log('writeBLECharacteristicValue success', res.errMsg)

          uni.showToast({

            title: '关锁',

            duration: 2000

          })

        },

        fail(res) {

          console.log(JSON.stringify(res))

          console.log(JSON.stringify(buffer))

        }

      })

    }

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