Alipay WeChat applet connects to Bluetooth and is compatible with IOS and Android (open source)
1 Introduction
Recently, the Bluetooth of Alipay and the Bluetooth of IOS have been broken. There are too many compatibility issues. After much stumbling, the Bluetooth problem of the Alipay applet and the WeChat applet was finally solved. This solution is a perfect solution
- Android WeChat applet
- IOS WeChat applet
- Android Alipay applet
Bluetooth connection problem of IOS Alipay applet
2. Solutions
Because the APIs of Alipay and WeChat are different, the parsing after receiving the message is also different, so two APIJS files are written for Alipay and WeChat. If the business only involves one-sided Bluetooth connection, you only need to introduce the required js.
In addition, IOS and Android are also slightly different, and the bytes that different mobile phone models can send are also different. This is all the result of going through pitfalls, and a lot of bitter tears.
3. WeChat API file
Create a new BLEWX.js file
/**
* 微信连接蓝牙API
* @author RedEric
* @date 2023年9月6日
*/
const logEnable = false
let isAndroid = false
let BluetoothAdapterStateChangeCallback = () => {}
let BLEConnectionStateChangeCallback = () => {}
let DeviceId = ''
let GattServerUUID = ''
const GattServerUUIDOption1 = '0000FFF0-0000-1000-8000-00805F9B34FB'
const GattServerUUIDOption2 = 'FFF0'
let GattCharacteristicWriteUUID = ''
const GattCharacteristicWriteUUIDOption1 = '0000FFF2-0000-1000-8000-00805F9B34FB'
const GattCharacteristicWriteUUIDOption2 = 'FFF2'
const log = data => {
if (logEnable) {
console.log('[eciot]:' + JSON.stringify(data))
}
}
const onBluetoothAdapterStateChange = cb => {
BluetoothAdapterStateChangeCallback = cb
}
const getSetting = () => {
return new Promise(function (resolve, reject) {
wx.getSetting({
success(res) {
log(res)
if (res.authSetting && res.authSetting['scope.bluetooth']) {
resolve({ ok: true, errCode: 0, errMsg: '' })
} else {
resolve({
ok: false,
errCode: 30001,
errMsg: 'getSetting fail',
})
}
},
fail(res) {
log(res)
resolve({
ok: false,
errCode: res.errCode ? res.errCode : 30000,
errMsg: res.errMsg ? res.errMsg : 'getSetting fail',
})
},
})
})
}
const authorize = () => {
return new Promise(function (resolve, reject) {
wx.authorize({
scope: 'scope.bluetooth',
success(res) {
log(res)
resolve({ ok: true, errCode: 0, errMsg: '' })
},
fail(res) {
log(res)
// {"errMsg":"authorize:fail:auth deny"}
resolve({ ok: false, errCode: 30000, errMsg: res.errMsg })
},
})
})
}
const _openBluetoothAdapter = () => {
return new Promise(function (resolve, reject) {
wx.openBluetoothAdapter({
success(res) {
log(res)
// {errno: 0, errMsg: "openBluetoothAdapter:ok"}
resolve({ ok: true, errCode: 0, errMsg: '' })
},
fail(res) {
log(res)
resolve({
ok: false,
errCode: res.errCode ? res.errCode : 30000,
errMsg: res.errMsg,
})
},
})
})
}
const openBluetoothAdapter = async () => {
await _openBluetoothAdapter()
const systemInfo = wx.getSystemInfoSync()
log(systemInfo)
if (systemInfo.platform.toLowerCase() === 'android') {
isAndroid = true
}
if (!systemInfo.bluetoothEnabled) {
BluetoothAdapterStateChangeCallback({
ok: false,
errCode: 30001,
errMsg: '请打开系统蓝牙开关',
})
return
}
if (isAndroid && !systemInfo.locationEnabled) {
BluetoothAdapterStateChangeCallback({
ok: false,
errCode: 30002,
errMsg: '请打开系统定位开关',
})
return
}
if (isAndroid && !systemInfo.locationAuthorized) {
BluetoothAdapterStateChangeCallback({
ok: false,
errCode: 30003,
errMsg: '请打开微信定位权限，允许微信使用您的位置信息',
})
return
}
const setting = await getSetting() //小程序蓝牙权限
if (!setting.ok) {
const authRes = await authorize()
if (!authRes.ok) {
BluetoothAdapterStateChangeCallback({
ok: false,
errCode: 30004,
errMsg: '请打开小程序蓝牙开关，点击右上角三个点，然后点击设置',
})
return
}
}
wx.offBluetoothAdapterStateChange()
wx.onBluetoothAdapterStateChange(res => {
log(res) // {available: true, discovering: true}
if (!res.available) {
BluetoothAdapterStateChangeCallback({
ok: false,
errCode: 30005,
errMsg: '蓝牙适配器不可用',
})
}
})
const openRes = await _openBluetoothAdapter()
BluetoothAdapterStateChangeCallback(openRes)
}
const onBluetoothDeviceFound = cb => {
wx.offBluetoothDeviceFound()
wx.onBluetoothDeviceFound(res => {
log(res)
const device = res.devices[0]
const name = device.name ? device.name : device.localName
if (!name) {
return
}
let id = device.deviceId
let rssi = device.RSSI
cb({ id, name, rssi })
})
}
const startBluetoothDevicesDiscovery = () => {
wx.startBluetoothDevicesDiscovery({
//services: [ecServerId],
allowDuplicatesKey: true,
powerLevel: 'high',
complete(res) {
log(res)
},
})
}
const stopBluetoothDevicesDiscovery = () => {
wx.stopBluetoothDevicesDiscovery({
complete(res) {
// {errno: 0, errMsg: "stopBluetoothDevicesDiscovery:ok", isDiscovering: false}
log(res)
},
})
}
const onBLEConnectionStateChange = cb => {
BLEConnectionStateChangeCallback = cb
}
const _createBLEConnection = () => {
return new Promise(function (resolve, reject) {
wx.createBLEConnection({
deviceId: DeviceId,
success(res) {
log(res)
// {"errno":0,"errCode":0,"errMsg":"createBLEConnection:ok"}
resolve({ ok: true, errCode: 0, errMsg: '' })
},
fail(res) {
log(res)
// {"errno":1001,"errMsg":"createBLEConnection:fail parameter error: parameter.deviceId should be String instead of Undefined;"}
resolve({
ok: false,
errCode: res.errCode ? res.errCode : res.errno,
errMsg: res.errMsg,
})
},
})
})
}
const getBLEDeviceServices = () => {
return new Promise(function (resolve, reject) {
wx.getBLEDeviceServices({
deviceId: DeviceId,
success(res) {
log(res)
//{"services":[{"uuid":"0000FFF0-0000-1000-8000-00805F9B34FB","isPrimary":true}],"errCode":0,"errno":0,"errMsg":"getBLEDeviceServices:ok"}
// {"errno":0,"deviceId":"7C7E20F2-CB75-6DA8-F8DF-FFF702B0D63F","services":[{"isPrimary":true,"uuid":"0000FFF0-0000-1000-8000-00805F9B34FB"}],"errMsg":"getBLEDeviceServices:ok","errCode":0}
resolve({
ok: true,
errCode: 0,
errMsg: '',
services: res.services,
})
},
fail(res) {
log(res)
resolve({ ok: false, errCode: res.errCode, errMsg: res.errMsg })
},
})
})
}
const getBLEDeviceCharacteristics = serviceId => {
return new Promise(function (resolve, reject) {
wx.getBLEDeviceCharacteristics({
deviceId: DeviceId,
serviceId,
success(res) {
log(res)
resolve({
ok: true,
errCode: 0,
errMsg: '',
characteristics: res.characteristics,
})
},
fail(res) {
log(res)
resolve({ ok: false, errCode: res.errCode, errMsg: res.errMsg })
},
})
})
}
const notifyBLECharacteristicValueChange = (serviceId, characteristicId) => {
return new Promise(function (resolve, reject) {
wx.notifyBLECharacteristicValueChange({
state: true,
deviceId: DeviceId,
serviceId,
characteristicId,
success(res) {
log(res)
// {"errCode":0,"errno":0,"errMsg":"notifyBLECharacteristicValueChange:ok"}
resolve({ ok: true, errCode: 0, errMsg: '' })
},
fail(res) {
log(res)
resolve({ ok: false, errCode: res.errCode, errMsg: res.errMsg })
},
})
})
}
const setBLEMTU = mtu => {
return new Promise(function (resolve, reject) {
wx.setBLEMTU({
deviceId: DeviceId,
mtu,
success(res) {
log(res)
// {"errMsg":"setBLEMTU:ok","errno":0,"errCode":0,"mtu":50}
resolve({ ok: true, errCode: 0, errMsg: '' })
},
fail(res) {
log(res)
// {"errCode":-1,"errno":1500104,"errMsg":"setBLEMTU:fail:internal error"}
resolve({ ok: false, errCode: res.errCode, errMsg: res.errMsg })
},
})
})
}
//和设备建立连接
const createBLEConnection = async id => {
DeviceId = id
wx.offBLEConnectionStateChange()
wx.onBLEConnectionStateChange(async res => {
log(res)
// {"deviceId":"EC:22:05:13:78:49","connected":true}
if (res.connected) {
const servicesResult = await getBLEDeviceServices()
if (!servicesResult.ok) {
BLEConnectionStateChangeCallback(servicesResult)
closeBLEConnection()
return
}
for (const service of servicesResult.services) {
if ((service.uuid.toUpperCase() === GattServerUUIDOption1) ||
(service.uuid.toUpperCase() === GattServerUUIDOption2)) {
GattServerUUID = service.uuid
}
const characteristicsResult = await getBLEDeviceCharacteristics(
service.uuid
)
if (!characteristicsResult.ok) {
BLEConnectionStateChangeCallback(characteristicsResult)
closeBLEConnection()
return
}
for (const characteristic of characteristicsResult.characteristics) {
if (
characteristic.properties &&
characteristic.properties.notify
) {
const notifyResult =
await notifyBLECharacteristicValueChange(
service.uuid,
characteristic.uuid
)
if (!notifyResult.ok) {
BLEConnectionStateChangeCallback({
ok: false,
errCode: 30000,
errMsg: 'notify error',
})
closeBLEConnection()
return
}
}
if ((characteristic.uuid.toUpperCase() === GattCharacteristicWriteUUIDOption1) ||
(characteristic.uuid.toUpperCase() === GattCharacteristicWriteUUIDOption2)) {
GattCharacteristicWriteUUID = characteristic.uuid
}
}
}
if (isAndroid) {
await setBLEMTU(247)
}
BLEConnectionStateChangeCallback({
ok: true,
errCode: 0,
errMsg: '',
})
} else {
BLEConnectionStateChangeCallback({
ok: false,
errCode: 0,
errMsg: 'disconnect',
})
}
})
const res = await _createBLEConnection()
if (!res.ok) {
BLEConnectionStateChangeCallback(res)
}
}
//关闭当前连接
const closeBLEConnection = () => {
wx.closeBLEConnection({
deviceId: DeviceId,
complete(res) {
log(res)
},
})
}
const onBLECharacteristicValueChange = cb => {
wx.offBLECharacteristicValueChange()
wx.onBLECharacteristicValueChange(res => {
log(res)
let x = new Uint8Array(res.value)
log(x)
let str = utf8BytesToStr(x)
let strHex = ''
for (let i = 0; i < x.length; i++) {
strHex =
strHex + x[i].toString(16).padStart(2, '0').toUpperCase()
}
log(str)
log(strHex)
cb(str, strHex)
})
}
const _writeBLECharacteristicValue = buffer => {
return new Promise(function (resolve, reject) {
wx.writeBLECharacteristicValue({
deviceId: DeviceId,
serviceId: GattServerUUID,
characteristicId: GattCharacteristicWriteUUID,
value: buffer,
success(res) {
log(res)
// {"errno":0,"errCode":0,"errMsg":"writeBLECharacteristicValue:ok"}
resolve({ ok: true, errCode: 0, errMsg: '' })
},
fail(res) {
log(res)
resolve({ ok: false, errCode: res.errCode, errMsg: res.errMsg })
},
})
})
}
const writeBLECharacteristicValue = async (str, isHex) => {
if (str.length === 0)
return { ok: false, errCode: 30000, errMsg: 'data is null' }
let buffer
if (isHex) {
buffer = new ArrayBuffer(str.length / 2)
let x = new Uint8Array(buffer)
for (let i = 0; i < x.length; i++) {
x[i] = parseInt(str.substr(2 * i, 2), 16)
}
} else {
buffer = new Uint8Array(strToUtf8Bytes(str)).buffer
}
return await _writeBLECharacteristicValue(buffer)
}
const utf8BytesToStr = utf8Bytes => {
let unicodeStr = ''
for (let pos = 0; pos < utf8Bytes.length; ) {
let flag = utf8Bytes[pos]
let unicode = 0
if (flag >>> 7 === 0) {
unicodeStr += String.fromCharCode(utf8Bytes[pos])
pos += 1
} else if ((flag & 0xf0) === 0xf0) {
unicode = (utf8Bytes[pos] & 0xf) << 18
unicode |= (utf8Bytes[pos + 1] & 0x3f) << 12
unicode |= (utf8Bytes[pos + 2] & 0x3f) << 6
unicode |= utf8Bytes[pos + 3] & 0x3f
unicodeStr += String.fromCharCode(unicode)
pos += 4
} else if ((flag & 0xe0) === 0xe0) {
unicode = (utf8Bytes[pos] & 0x1f) << 12
unicode |= (utf8Bytes[pos + 1] & 0x3f) << 6
unicode |= utf8Bytes[pos + 2] & 0x3f
unicodeStr += String.fromCharCode(unicode)
pos += 3
} else if ((flag & 0xc0) === 0xc0) {
//110
unicode = (utf8Bytes[pos] & 0x3f) << 6
unicode |= utf8Bytes[pos + 1] & 0x3f
unicodeStr += String.fromCharCode(unicode)
pos += 2
} else {
unicodeStr += String.fromCharCode(utf8Bytes[pos])
pos += 1
}
}
return unicodeStr
}
const strToUtf8Bytes = str => {
let bytes = []
for (let i = 0; i < str.length; ++i) {
let code = str.charCodeAt(i)
if (code >= 0x10000 && code <= 0x10ffff) {
bytes.push((code >> 18) | 0xf0) // 第一个字节
bytes.push(((code >> 12) & 0x3f) | 0x80)
bytes.push(((code >> 6) & 0x3f) | 0x80)
bytes.push((code & 0x3f) | 0x80)
} else if (code >= 0x800 && code <= 0xffff) {
bytes.push((code >> 12) | 0xe0)
bytes.push(((code >> 6) & 0x3f) | 0x80)
bytes.push((code & 0x3f) | 0x80)
} else if (code >= 0x80 && code <= 0x7ff) {
bytes.push((code >> 6) | 0xc0)
bytes.push((code & 0x3f) | 0x80)
} else {
bytes.push(code)
}
}
return bytes
}
module.exports = {
onBluetoothAdapterStateChange,
openBluetoothAdapter,
onBluetoothDeviceFound,
startBluetoothDevicesDiscovery,
stopBluetoothDevicesDiscovery,
onBLEConnectionStateChange,
createBLEConnection,
closeBLEConnection,
onBLECharacteristicValueChange,
writeBLECharacteristicValue,
}
4. Alipay API file
Create a new BLEWX.js file
/**
* 微信连接蓝牙API
* @author RedEric
* @date 2023年9月6日
*/
const logEnable = false
let isAndroid = false
let BluetoothAdapterStateChangeCallback = () => { }
let BLEConnectionStateChangeCallback = () => { }
let DeviceId = ''
let GattServerUUID = ''
const GattServerUUIDOption1 = '0000FFF0-0000-1000-8000-00805F9B34FB'
const GattServerUUIDOption2 = 'FFF0'
let GattCharacteristicWriteUUID = ''
const GattCharacteristicWriteUUIDOption1 = '0000FFF2-0000-1000-8000-00805F9B34FB'
const GattCharacteristicWriteUUIDOption2 = 'FFF2'
const log = data => {
if (logEnable) {
console.log('[eciot]:' + JSON.stringify(data))
}
}
const onBluetoothAdapterStateChange = cb => {
BluetoothAdapterStateChangeCallback = cb
}
const getSetting = () => {
return new Promise(function (resolve, reject) {
my.getSetting({
success(res) {
log(res)
if (res.authSetting && res.authSetting.bluetooth) {
resolve({ ok: true, errCode: 0, errMsg: '' })
} else {
resolve({
ok: false,
errCode: 30001,
errMsg: 'getSetting fail',
})
}
},
fail(res) {
log(res)
resolve({
ok: false,
errCode: res.error ? res.error : 30000,
errMsg: res.errorMessage ? res.errorMessage : 'getSetting fail',
})
},
})
})
}
const authorize = async () => {
return await _openBluetoothAdapter()
}
const _openBluetoothAdapter = () => {
return new Promise(function (resolve, reject) {
my.openBluetoothAdapter({
success(res) {
log(res)
if (res.isSupportBLE) {
resolve({ ok: true, errCode: 0, errMsg: '' })
} else {
resolve({ ok: false, errCode: 30001, errMsg: 'isSupportBLE is false' })
}
},
fail(res) {
log(res)
resolve({
ok: false,
errCode: res.error ? res.error : 30000,
errMsg: res.errorMessage,
})
},
})
})
}
const openBluetoothAdapter = async () => {
await _openBluetoothAdapter()
const systemInfo = my.getSystemInfoSync()
log(systemInfo)
if (systemInfo.platform.toLowerCase() === 'android') {
isAndroid = true
}
if (isAndroid && !systemInfo.bluetoothEnabled) {
BluetoothAdapterStateChangeCallback({
ok: false,
errCode: 30001,
errMsg: '请打开系统蓝牙开关',
})
return
}
if (isAndroid && !systemInfo.locationEnabled) {
BluetoothAdapterStateChangeCallback({
ok: false,
errCode: 30002,
errMsg: '请打开系统定位开关',
})
return
}
if (isAndroid && !systemInfo.locationAuthorized) {
BluetoothAdapterStateChangeCallback({
ok: false,
errCode: 30003,
errMsg: '请打开支付宝定位权限，允许支付宝使用您的位置信息',
})
return
}
const setting = await getSetting() //小程序蓝牙权限
if (!setting.ok) {
const authRes = await authorize()
if (!authRes.ok) {
BluetoothAdapterStateChangeCallback({
ok: false,
errCode: 30004,
errMsg: '请打开小程序蓝牙开关，点击右上角三个点，然后点击设置',
})
return
}
}
my.offBluetoothAdapterStateChange()
my.onBluetoothAdapterStateChange(res => {
log(res)
// {"available":false,"discovering":false,"NBPageUrl":"https://2021002131657266.hybrid.alipay-eco.com/index.html#pages/index/index"}
if (!res.available) {
BluetoothAdapterStateChangeCallback({
ok: false,
errCode: 30005,
errMsg: '蓝牙适配器不可用',
})
}
})
const openRes = await _openBluetoothAdapter()
BluetoothAdapterStateChangeCallback(openRes)
}
const onBluetoothDeviceFound = cb => {
my.offBluetoothDeviceFound()
my.onBluetoothDeviceFound(res => {
log(res)
const device = res.devices[0]
const name = device.name ? device.name : device.localName
if (!name) {
return
}
let id = device.deviceId
let rssi = device.RSSI
cb({ id, name, rssi })
})
}
const startBluetoothDevicesDiscovery = () => {
my.startBluetoothDevicesDiscovery({
//services: [ecServerId],
allowDuplicatesKey: true,
// powerLevel: 'high',
complete(res) {
log(res)
},
})
}
const stopBluetoothDevicesDiscovery = () => {
my.stopBluetoothDevicesDiscovery({
complete(res) {
log(res)
},
})
}
const onBLEConnectionStateChange = cb => {
BLEConnectionStateChangeCallback = cb
}
const _createBLEConnection = () => {
return new Promise(function (resolve, reject) {
my.connectBLEDevice({
deviceId: DeviceId,
success(res) {
log(res)
resolve({ ok: true, errCode: 0, errMsg: '' })
},
fail(res) {
log(res)
resolve({
ok: false,
errCode: res.error,
errMsg: res.errorMessage,
})
},
})
})
}
const getBLEDeviceServices = () => {
return new Promise(function (resolve, reject) {
my.getBLEDeviceServices({
deviceId: DeviceId,
success(res) {
log(res)
resolve({
ok: true,
errCode: 0,
errMsg: '',
services: res.services,
})
},
fail(res) {
log(res)
resolve({ ok: false, errCode: res.error, errMsg: res.errorMessage })
},
})
})
}
const getBLEDeviceCharacteristics = serviceId => {
return new Promise(function (resolve, reject) {
my.getBLEDeviceCharacteristics({
deviceId: DeviceId,
serviceId,
success(res) {
log(res)
resolve({
ok: true,
errCode: 0,
errMsg: '',
characteristics: res.characteristics,
})
},
fail(res) {
log(res)
resolve({ ok: false, errCode: res.error, errMsg: res.errorMessage })
},
})
})
}
const notifyBLECharacteristicValueChange = (serviceId, characteristicId) => {
return new Promise(function (resolve, reject) {
my.notifyBLECharacteristicValueChange({
state: true,
deviceId: DeviceId,
serviceId,
characteristicId,
success(res) {
log(res)
resolve({ ok: true, errCode: 0, errMsg: '' })
},
fail(res) {
log(res)
resolve({ ok: false, errCode: res.error, errMsg: res.errorMessage })
},
})
})
}
const setBLEMTU = mtu => {
return new Promise(function (resolve, reject) {
my.setBLEMTU({
deviceId: DeviceId,
mtu,
success(res) {
log(res)
resolve({ ok: true, errCode: 0, errMsg: '' })
},
fail(res) {
log(res)
resolve({ ok: false, errCode: res.error, errMsg: res.errorMessage })
},
})
})
}
const createBLEConnection = async id => {
console.log('创建连接')
DeviceId = id
my.offBLEConnectionStateChanged()
my.onBLEConnectionStateChanged(async res => {
log(res)
// {"deviceId":"EC:22:05:13:78:49","connected":true}
if (res.connected) {
const servicesResult = await getBLEDeviceServices()
if (!servicesResult.ok) {
BLEConnectionStateChangeCallback(servicesResult)
closeBLEConnection()
return
}
for (const service of servicesResult.services) {
if ((service.serviceId.toUpperCase() === GattServerUUIDOption1) ||
(service.serviceId.toUpperCase() === GattServerUUIDOption2)) {
GattServerUUID = service.serviceId
}
const characteristicsResult = await getBLEDeviceCharacteristics(
service.serviceId
)
if (!characteristicsResult.ok) {
BLEConnectionStateChangeCallback(characteristicsResult)
closeBLEConnection()
return
}
for (const characteristic of characteristicsResult.characteristics) {
if (
characteristic.properties &&
characteristic.properties.notify
) {
const notifyResult =
await notifyBLECharacteristicValueChange(
service.serviceId,
characteristic.characteristicId
)
if (!notifyResult.ok) {
BLEConnectionStateChangeCallback({
ok: false,
errCode: 30000,
errMsg: 'notify error',
})
closeBLEConnection()
return
}
}
if ((characteristic.characteristicId.toUpperCase() === GattCharacteristicWriteUUIDOption1) ||
(characteristic.characteristicId.toUpperCase() === GattCharacteristicWriteUUIDOption2)) {
GattCharacteristicWriteUUID = characteristic.characteristicId
}
}
}
if (isAndroid) {
await setBLEMTU(247)
}
BLEConnectionStateChangeCallback({
ok: true,
errCode: 0,
errMsg: '',
})
} else {
BLEConnectionStateChangeCallback({
ok: false,
errCode: 0,
errMsg: 'disconnect',
})
}
})
const res = await _createBLEConnection()
if (!res.ok) {
BLEConnectionStateChangeCallback(res)
}
}
const closeBLEConnection = () => {
my.disconnectBLEDevice({
deviceId: DeviceId,
complete(res) {
log(res)
},
})
}
const onBLECharacteristicValueChange = cb => {
my.offBLECharacteristicValueChange()
my.onBLECharacteristicValueChange(res => {
log(res)
let bytes = []
for (let i = 0; i < (res.value.length / 2); i++) {
bytes.push(parseInt(res.value.substr(i * 2, 2), 16))
}
let str = utf8BytesToStr(bytes)
let strHex = res.value
log(str)
log(strHex)
cb(str, strHex)
})
}
const _writeBLECharacteristicValue = buffer => {
return new Promise(function (resolve, reject) {
my.writeBLECharacteristicValue({
deviceId: DeviceId,
serviceId: GattServerUUID,
characteristicId: GattCharacteristicWriteUUID,
value: buffer,
// writeType: 'writeNoResponse',
success(res) {
log(res)
resolve({ ok: true, errCode: 0, errMsg: '' })
},
fail(res) {
log(res)
resolve({ ok: false, errCode: res.error, errMsg: res.errorMessage })
},
})
})
}
const writeBLECharacteristicValue = async (str, isHex) => {
if (str.length === 0)
return { ok: false, errCode: 30000, errMsg: 'data is null' }
let buffer
if (isHex) {
buffer = new ArrayBuffer(str.length / 2)
let x = new Uint8Array(buffer)
for (let i = 0; i < x.length; i++) {
x[i] = parseInt(str.substr(2 * i, 2), 16)
}
} else {
buffer = new Uint8Array(strToUtf8Bytes(str)).buffer
}
return await _writeBLECharacteristicValue(buffer)
}
const utf8BytesToStr = utf8Bytes => {
let unicodeStr = ''
for (let pos = 0; pos < utf8Bytes.length;) {
let flag = utf8Bytes[pos]
let unicode = 0
if (flag >>> 7 === 0) {
unicodeStr += String.fromCharCode(utf8Bytes[pos])
pos += 1
}
else if ((flag & 0xf0) === 0xf0) {
unicode = (utf8Bytes[pos] & 0xf) << 18
unicode |= (utf8Bytes[pos + 1] & 0x3f) << 12
unicode |= (utf8Bytes[pos + 2] & 0x3f) << 6
unicode |= utf8Bytes[pos + 3] & 0x3f
unicodeStr += String.fromCharCode(unicode)
pos += 4
} else if ((flag & 0xe0) === 0xe0) {
unicode = (utf8Bytes[pos] & 0x1f) << 12
unicode |= (utf8Bytes[pos + 1] & 0x3f) << 6
unicode |= utf8Bytes[pos + 2] & 0x3f
unicodeStr += String.fromCharCode(unicode)
pos += 3
} else if ((flag & 0xc0) === 0xc0) {
//110
unicode = (utf8Bytes[pos] & 0x3f) << 6
unicode |= utf8Bytes[pos + 1] & 0x3f
unicodeStr += String.fromCharCode(unicode)
pos += 2
} else {
unicodeStr += String.fromCharCode(utf8Bytes[pos])
pos += 1
}
}
return unicodeStr
}
const strToUtf8Bytes = str => {
let bytes = []
for (let i = 0; i < str.length; ++i) {
let code = str.charCodeAt(i)
if (code >= 0x10000 && code <= 0x10ffff) {
bytes.push((code >> 18) | 0xf0) // 第一个字节
bytes.push(((code >> 12) & 0x3f) | 0x80)
bytes.push(((code >> 6) & 0x3f) | 0x80)
bytes.push((code & 0x3f) | 0x80)
} else if (code >= 0x800 && code <= 0xffff) {
bytes.push((code >> 12) | 0xe0)
bytes.push(((code >> 6) & 0x3f) | 0x80)
bytes.push((code & 0x3f) | 0x80)
} else if (code >= 0x80 && code <= 0x7ff) {
bytes.push((code >> 6) | 0xc0)
bytes.push((code & 0x3f) | 0x80)
} else {
bytes.push(code)
}
}
return bytes
}
module.exports = {
onBluetoothAdapterStateChange,
openBluetoothAdapter,
onBluetoothDeviceFound,
startBluetoothDevicesDiscovery,
stopBluetoothDevicesDiscovery,
onBLEConnectionStateChange,
createBLEConnection,
closeBLEConnection,
onBLECharacteristicValueChange,
writeBLECharacteristicValue,
}
6. How to use
The page introduces the corresponding API file and then calls the API method.
const BLEApi = require('../../common/utils/BLEUtil/BLEAPI.js')
let _this;
let deviceListData = []
export default {
data() {
return {
deviceListDataShow: []
}
},
onLoad() {
_this = this
setInterval(() => {
_this.deviceListDataShow = JSON.parse(JSON.stringify(deviceListData))
}, 800)
},
onShow() {
setTimeout(() => {
_this.openBluetoothAdapter()
}, 100)
},
methods: {
listViewTap(id){
uni.showLoading('设备连接中')
BLEApi.onBLEConnectionStateChange(res => {
uni.hideLoading()
if (res.ok) {
BLEApi.stopBluetoothDevicesDiscovery()
uni.navigateTo({ url: '../device/device' })
} else {
uni.showModal({
title: '提示',
content: '连接失败,errCode=' + res.errCode + ',errMsg=' + res.errMsg
})
}
})
BLEApi.createBLEConnection(id)
},
openBluetoothAdapter() {
BLEApi.onBluetoothAdapterStateChange(res => {
if (res.ok) {
console.log('Bluetooth adapter ok')
_this.startBluetoothDevicesDiscovery()
} else {
uni.showModal({
title: '提示',
content: `Bluetooth adapter error | ${res.errCode} | ${res.errMsg}`
})
}
})
BLEApi.openBluetoothAdapter()
},
startBluetoothDevicesDiscovery() {
console.log('start search')
BLEApi.onBluetoothDeviceFound(res => {
// if(res.id==="EC:22:05:13:78:49")
// console.log(`id:${res.id},name:${res.name},rssi:${res.rssi}`)
for (const item of deviceListData) {
if (item.id === res.id) {
item.name = res.name
item.rssi = res.rssi
return
}
}
let manufacturer = ''
if (res.name.length === 11 && res.name.startsWith('@')) {
manufacturer = 'eciot'
}
if (res.name.length === 15 && res.name.startsWith('BT_')) {
manufacturer = 'eciot'
}
deviceListData.push({
id: res.id,
name: res.name,
rssi: res.rssi,
manufacturer,
})
})
BLEApi.startBluetoothDevicesDiscovery()
},
}
}
7. Complete example
Can be used on Android, Alipay, IOS, and Android
| Bluetooth not turned on | Turn on Bluetooth, Bluetooth list | Connect to Bluetooth and send and receive messages |
|---|---|---|
 |
 |
 |
Source address:
https://download.csdn.net/download/qq_35921773/88306318