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class Device {
#deviceName
#primaryServiceUuid
#writeCharacteristicUuid
#notifyCharacteristicUuid
constructor(deviceName, primaryServiceUuid, writeCharacteristicUuid, notifyCharacteristicUuid) {
this.#deviceName = deviceName
this.#primaryServiceUuid = primaryServiceUuid
this.#writeCharacteristicUuid = writeCharacteristicUuid
this.#notifyCharacteristicUuid = notifyCharacteristicUuid
}
static airmxPro() {
return new Device(
'AIRMX Pro',
'22210000-554a-4546-5542-46534450464d',
'22210001-554a-4546-5542-46534450464d',
'22210002-554a-4546-5542-46534450464d'
)
}
get name() {
return this.#deviceName
}
get primaryServiceUuid() {
return this.#primaryServiceUuid
}
get writeCharacteristicUuid() {
return this.#writeCharacteristicUuid
}
get notifyCharacteristicUuid() {
return this.#notifyCharacteristicUuid
}
}
class Dispatcher {
#characteristic
#sequenceNumber = 1
#chunkSize = 16
constructor(characteristic) {
this.#characteristic = characteristic
}
async dispatch(command) {
const data = this.#chunk(command.payload, command)
for (let chunk of data) {
console.log(`Sending chunk: ${Array.from(chunk).map(b => b.toString(16).padStart(2, '0')).join(' ')}`)
await this.#characteristic.writeValueWithResponse(chunk)
await delay(500)
}
}
#chunk(data, command) {
const packets = this.#chunked(data, this.#chunkSize)
const total = packets.length
if (total === 0) {
return [
this.#packetHeader(
this.#sequenceNumber++, 1, 1, // 1 of 1 packet
command.commandId
)
]
}
return packets.map((chunk, index) => {
return new Uint8Array([
...this.#packetHeader(
this.#sequenceNumber++, index + 1, total,
command.commandId
),
...chunk
])
})
}
/**
* Splits an array into chunks of `size`.
*
* @param {Uint8Array} data - The array of 8-bit unsigned integers.
* @param {number} size - The size of each chunk.
*/
#chunked(data, size) {
const packets = []
for (let i = 0; i < data.length; i += size) {
packets.push(data.slice(i, i + size))
}
return packets
}
#packetHeader(sequenceNumber, currentPacket, totalPacket, commandId) {
return new Uint8Array([
sequenceNumber,
currentPacket << 4 | totalPacket,
0x00, // Unencrypted flag
commandId
])
}
}
class Command {
get commandId() {
throw new Error('The command ID does not exist.')
}
get payload() {
throw new Error('The payload does not exist.')
}
}
class HandshakeCommand extends Command {
get commandId() {
return 0x0b
}
get payload() {
return new Uint8Array([
0x08, // The storage size of the token
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, // Token: 0
0x05, // The length of the version
0x31, 0x2e, 0x30, 0x2e, 0x30 // Version: 1.0.0
])
}
}
class ConfigureWifiCommand extends Command {
#ssid
#password
constructor(ssid, password) {
super()
this.#ssid = ssid
this.#password = password
}
get commandId() {
return 0x15
}
get payload() {
const encoder = new TextEncoder()
const ssid = encoder.encode(this.#ssid)
const password = encoder.encode(this.#password)
return new Uint8Array([
ssid.length, ...ssid,
password.length, ...password
])
}
}
class RequestIdentityCommand extends Command {
get commandId() {
return 0x16
}
get payload() {
return new Uint8Array([
//
])
}
}
async function delay(ms) {
return new Promise(resolve => setTimeout(resolve, ms))
}
async function connect() {
const ssid = document.getElementById('ssid')
const password = document.getElementById('password')
if (ssid.value === '' || password.value === '') {
return
}
const device = Device.airmxPro()
const wifiCredentials = { ssid: ssid.value, password: password.value }
await connectToDevice(device, wifiCredentials)
}
async function connectToDevice(device, wifiCredentials) {
const bluetoothDevice = await navigator.bluetooth.requestDevice({
filters: [{ name: device.name }],
optionalServices: [device.primaryServiceUuid]
})
const server = await bluetoothDevice.gatt.connect()
const service = await server.getPrimaryService(device.primaryServiceUuid)
const writeCharacteristic = await service.getCharacteristic(device.writeCharacteristicUuid)
const notifyCharacteristic = await service.getCharacteristic(device.notifyCharacteristicUuid)
await notifyCharacteristic.startNotifications()
notifyCharacteristic.addEventListener('characteristicvaluechanged', handleDeviceResponse)
const dispatcher = new Dispatcher(writeCharacteristic)
await dispatcher.dispatch(new HandshakeCommand())
await dispatcher.dispatch(new ConfigureWifiCommand(wifiCredentials.ssid, wifiCredentials.password))
await dispatcher.dispatch(new RequestIdentityCommand())
}
function handleDeviceResponse(event) {
const value = event.target.value
const receivedBytes = []
for (let i = 0; i < value.byteLength; i++) {
receivedBytes.push(value.getUint8(i).toString(16).padStart(2, '0'))
}
console.log(`Received data from device: ${receivedBytes.join(' ')}`)
}
const button = document.getElementById('connect')
button.addEventListener('click', connect)
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