最近公司想做一個(gè)小程序使用藍(lán)牙連接硬件設(shè)備進(jìn)行相互傳輸數(shù)據(jù)指令, 接下來是我做這個(gè)功能的總結(jié)
兩種藍(lán)牙普遍使用規(guī)格
- 藍(lán)牙基礎(chǔ)率/增強(qiáng)數(shù)據(jù)率
也稱為經(jīng)典藍(lán)牙。常用在對(duì)數(shù)據(jù)傳輸帶寬有一定要求的場(chǎng)景上，比如需要傳輸音頻數(shù)據(jù)的藍(lán)牙音箱、藍(lán)牙耳
機(jī)等； - 藍(lán)牙低功耗
特點(diǎn)就是功耗極低,傳輸速度更快, 常用在對(duì)續(xù)航要求較高且只需小數(shù)據(jù)量傳輸?shù)母鞣N智能電子產(chǎn)品中，比如
智能穿戴設(shè)備、智能家電、傳感器等，應(yīng)用場(chǎng)景廣泛。
實(shí)現(xiàn)步驟
4bb6a82c858e1aed51e2aff72f9ad2e.jpg
初始化藍(lán)牙
/**
* 初始化藍(lán)牙設(shè)備
*/
onConnect() {
let that = this;
wx.openBluetoothAdapter({ //調(diào)用微信小程序api 打開藍(lán)牙適配器接口
success: function(res) {
that.startBluetoothDevicesDiscovery(); // 調(diào)用搜索
wx.showLoading({
title: '搜索中',
})
},
fail: function(res) {
wx.showToast({
title: '請(qǐng)先開啟藍(lán)牙',
icon: 'none',
duration: 1000
})
}
});
},
開始搜索藍(lán)牙設(shè)備
startBluetoothDevicesDiscovery: function() {
var that = this;
wx.startBluetoothDevicesDiscovery({
success: function(res) {
console.log("discovery", res);
if (res.errCode == 0) { // 搜索成功
that.getConnect(); // 調(diào)用連接該設(shè)備
}
},
});
},
開始連接
getConnect: function() {
var that = this;
var timer = setInterval(function() {
wx.getBluetoothDevices({ // 獲取在藍(lán)牙模塊生效期間所有搜索到的藍(lán)牙設(shè)備。包括已經(jīng)和本機(jī)處于連接狀態(tài)的設(shè)備
success: function(res) {
console.log("devices", res);
for (var i = 0; i < res.devices.length; i++) {
if (res.devices[i].name == that.data.deviceName) {
wx.hideLoading();
wx.showLoading({
title: '連接中',
})
that.setData({
isFinded: true
});
clearInterval(timer);
that.setData({
deviceId: res.devices[i].deviceId
});
console.log('設(shè)備號(hào)', that.data.deviceId);
console.log("開始嘗試建立連接");
wx.createBLEConnection({ // 連接藍(lán)牙低功耗設(shè)備。
deviceId: that.data.deviceId,
timeout: 10000,
success: function(res) {
console.log(res);
if (res.errCode == 0) {
console.log('連接成功')
that.setData({
isConnected: true
});
wx.stopBluetoothDevicesDiscovery(); // 如果已經(jīng)找到, 停止搜尋附近的藍(lán)牙外圍設(shè)備。
} else {
wx.showModal({
title: '提示',
content: '不能正常對(duì)藍(lán)牙設(shè)備進(jìn)行連接',
showCancel: false
})
}
},
fail: (res) => {
wx.hideLoading();
if (res.errCode == 10012) {
wx.showModal({
title: '提示',
content: '連接超時(shí)',
showCancel: false
})
}
console.warn("fail", res);
},
complete: () => {
wx.hideLoading();
}
})
break;
}
}
}
});
},
3000);
setTimeout(function() {
if (!that.data.isFinded && !that.data.isConnected) {
clearInterval(timer);
that.setData({
isFailed: false
});
wx.hideLoading();
wx.showModal({
title: '提示',
content: '搜索藍(lán)牙超時(shí)',
showCancel: false
})
}
}, 12000);
},
獲取設(shè)備信息
onGetuuid(){
let that = this;
if(that.data.isConnected && that.data.isFailed){
wx.showLoading({
title: '獲取serviceId',
})
console.log("開始獲取設(shè)備信息");
wx.getBLEDeviceServices({
deviceId,
success(getServicesRes) {
console.log("getServicesRes", getServicesRes);
let service = getServicesRes.services[1]
let serviceId = service.uuid
console.log(serviceId);
wx.showLoading({
title: '獲取characteristicId',
})
wx.getBLEDeviceCharacteristics({
deviceId,
serviceId,
success(getCharactersRes) {
console.log("getCharactersRes", getCharactersRes);
wx.hideLoading();
let characteristic = getCharactersRes.characteristics[0]
let characteristicId = characteristic.uuid
wx.notifyBLECharacteristicValueChange({
state: true,
deviceId,
serviceId,
characteristicI,
success() {
console.log('開始監(jiān)聽特征值')
wx.onBLECharacteristicValueChange(function (onNotityChangeRes) {
console.log('監(jiān)聽到特征值更新', onNotityChangeRes);
let characteristicValue = that.ab2hex(onNotityChangeRes.value);
console.log("characteristicValue-16進(jìn)制", characteristicValue ); // 設(shè)備返回的16進(jìn)制值
wx.showModal({
title: '監(jiān)聽到特征值更新',
content: `更新后的特征值(16進(jìn)制格式):${characteristicValue}`,
showCancel: false
})
})
},
fail: (res) => {
console.warn("監(jiān)聽特征值失敗");
}
})
},
fail: (res) => {
console.warn("獲取特征值信息失敗", res);
},
complete: (res) => {
console.log('獲取服務(wù)信息完成',res);
wx.hideLoading();
}
})
},
fail: (res) => {
console.warn("獲取服務(wù)信息失敗", res);
},
complete: () => {
wx.hideLoading();
}
})
}else{
wx.showToast({
title: '請(qǐng)先連接藍(lán)牙',
})
}
},
發(fā)送指令
onSendCommand() {
var buf = new ArrayBuffer(6);
let dataView = new DataView(buf);
wx.writeBLECharacteristicValue({
// 需要上面的 getBluetoothDevices 或者 onBluetoothDeviceFound 接口中獲取
deviceId,
// 需要在上面的 getBLEDeviceServices 接口中獲取
serviceId,
// getBLEDeviceCharacteristics 接口中獲取
characteristicId,
value: buf,
success: function(res) {
console.log(res);
console.log("發(fā)送指令成功");
wx.showToast({
title: '發(fā)送成功',
icon: 'none'
})
},
fail: function(res) {
console.warn("發(fā)送指令失敗", res)
}
})
},
斷開連接
onCloseConnect(){
this.setData({
isConnected:false,
isFinded:false
})
wx.closeBLEConnection({
deviceId: this.data.deviceId,
success: function(res) {
console.log("成功斷開連接");
wx.showToast({
title: '成功斷開連接',
})
},
})
}
