我用小程序开发连接低功耗的蓝牙设备，通过 wx.createBLEConnection方法成功建立连接后。在通过wx.onBLEConnectionStateChange 监听会发现，建立的蓝牙连接，经常会发生断开。错误码10003错误，提示The specified device has disconnected from us. ,我尝试过很多蓝牙都会出现这种情况。并且断开时间不固定，有时候1分钟有时候几十秒，有时候长一些。可以确定是蓝牙是正常的，手机小程序是一直开着，手机没有熄屏。 下面是代码。
// pages/mian/test/index.js
var isConnectting=false;
Page({
/**
* 页面的初始数据
*/
data: {
list:[]
},
/**
* 生命周期函数--监听页面加载
*/
onLoad: function (options) {
this.startConnect();
},
/**
* 生命周期函数--监听页面初次渲染完成
*/
onReady: function () {
},
/**
* 生命周期函数--监听页面显示
*/
onShow: function () {
},
/**
* 生命周期函数--监听页面隐藏
*/
onHide: function () {
},
/**
* 生命周期函数--监听页面卸载
*/
onUnload: function () {
},
/**
* 页面相关事件处理函数--监听用户下拉动作
*/
onPullDownRefresh: function () {
},
/**
* 页面上拉触底事件的处理函数
*/
onReachBottom: function () {
},
/**
* 用户点击右上角分享
*/
onShareAppMessage: function () {
},
startConnect: function () {
var that = this;
wx.showLoading({
title: '开启蓝牙适配'
});
wx.openBluetoothAdapter({
success: function (res) {
console.log("初始化蓝牙适配器");
console.log(res);
that.getBluetoothAdapterState();
},
fail: function (err) {
console.log(err);
wx.showToast({
title: '蓝牙初始化失败',
icon: 'success',
duration: 2000
})
setTimeout(function () {
wx.hideToast()
}, 2000)
}
});
wx.onBluetoothAdapterStateChange(function (res) {
var available = res.available;
if (available) {
that.getBluetoothAdapterState();
}
})
},
getBluetoothAdapterState: function () {
var that = this;
wx.getBluetoothAdapterState({
success: function (res) {
var available = res.available,
discovering = res.discovering;
if (!available) {
wx.showToast({
title: '设备无法开启蓝牙连接',
icon: 'success',
duration: 2000
})
setTimeout(function () {
wx.hideToast()
}, 2000)
} else {
if (!discovering) {
that.startBluetoothDevicesDiscovery();
that.getConnectedBluetoothDevices();
}
}
}
})
}, startBluetoothDevicesDiscovery: function () {
var that = this;
wx.showLoading({
title: '蓝牙搜索'
});
wx.startBluetoothDevicesDiscovery({
services: [],
allowDuplicatesKey: false,
success: function (res) {
if (!res.isDiscovering) {
that.getBluetoothAdapterState();
} else {
that.onBluetoothDeviceFound();
}
},
fail: function (err) {
console.log(err);
}
});
}, getConnectedBluetoothDevices: function () {
var that = this;
wx.getConnectedBluetoothDevices({
services: [that.serviceId],
success: function (res) {
console.log("获取处于连接状态的设备", res);
var devices = res['devices'], flag = false, index = 0, conDevList = [];
devices.forEach(function (value, index, array) {
if (value['name'].indexOf('FeiZhi') != -1) {
// 如果存在包含FeiZhi字段的设备
flag = true;
index += 1;
conDevList.push(value['deviceId']);
that.deviceId = value['deviceId'];
return;
}
});
if (flag) {
this.connectDeviceIndex = 0;
that.loopConnect(conDevList);
} else {
if (!this.getConnectedTimer) {
that.getConnectedTimer = setTimeout(function () {
that.getConnectedBluetoothDevices();
}, 5000);
}
}
},
fail: function (err) {
if (!this.getConnectedTimer) {
that.getConnectedTimer = setTimeout(function () {
that.getConnectedBluetoothDevices();
}, 5000);
}
}
});
}, onBluetoothDeviceFound: function () {
var that = this;
console.log('onBluetoothDeviceFound');
let list=[];
wx.onBluetoothDeviceFound(function (res) {
console.log('new device list has founded')
console.log(res);
res.devices.forEach(item => {
var name = item['name'];
list.push(item);
that.setData({list})
if (name != '') {
if (name.indexOf('Look1') != -1) {
console.log("-----------------")
var deviceId = item['deviceId'];
that.deviceId = deviceId;
console.log(that.deviceId);
that.startConnectDevices();
return;
}
}
});
})
}, startConnectDevices: function (ltype, array) {
debugger
var that = this;
clearTimeout(that.getConnectedTimer);
that.getConnectedTimer = null;
clearTimeout(that.discoveryDevicesTimer);
//that.stopBluetoothDevicesDiscovery();
// 取消蓝牙监听事件
wx.offBluetoothDeviceFound(function(){})
wx.stopBluetoothDevicesDiscovery({
success:function(){
console.log("取消成功");
}
})
this.isConnectting = true;
wx.createBLEConnection({
deviceId: that.deviceId,
success: function (res) {
if (res.errCode == 0) {
setTimeout(function () {
that.getService(that.deviceId);
}, 5000)
}
},
fail: function (err) {
},
complete: function () {
}
});
}, getService: function (deviceId) {
var that = this;
// 监听蓝牙连接
wx.onBLEConnectionStateChange(function (res) {
console.log("蓝牙状态变化")
// 该方法回调中可以用于处理连接意外断开等异常情况
console.log(`device ${res.deviceId} state has changed, connected: ${res.connected}`)
console.log(res);
});
// 获取蓝牙设备service值
// wx.getBLEDeviceServices({
// deviceId: deviceId,
// success: function (res) {
// that.getCharacter(deviceId, res.services);
// }
// })
}, getCharacter: function (deviceId, services) {
var that = this;
services.forEach(function (value, index, array) {
if (value == that.serviceId) {
that.serviceId = array[index];
}
});
wx.getBLEDeviceCharacteristics({
deviceId: deviceId,
serviceId: that.serviceId,
success: function (res) {
that.writeBLECharacteristicValue(deviceId, that.serviceId, that.characterId_write);
that.openNotifyService(deviceId, that.serviceId, that.characterId_read);
},
fail: function (err) {
console.log(err);
},
complete: function () {
console.log('complete');
}
})
}, loopConnect: function (devicesId) {
var that = this;
var listLen = devicesId.length;
if (devicesId[this.connectDeviceIndex]) {
this.deviceId = devicesId[this.connectDeviceIndex];
this.startConnectDevices('loop', devicesId);
} else {
console.log('已配对的设备小程序蓝牙连接失败');
that.startBluetoothDevicesDiscovery();
that.getConnectedBluetoothDevices();
}
}
})
"The
啊 specified device has disconnected from us."
errMsg: "createBLEConnection:fail:connection fail status:8"
errno: 1509001