fix: use MACOS UserAgent for Android browser to fix pair code registration

The web protocol (WA\x06\x03) requires a web-compatible UserAgent.
Using SMB_ANDROID in the UserAgent caused pair code registration to
fail with "cannot connect device" even though the phone confirmation
appeared. The Android identity is now only set in DeviceProps.platformType
(ANDROID_PHONE) in the registration node, which correctly determines
the display name in "Linked Devices" as "Android (14)".

Changes:
- getUserAgent(): always returns MACOS platform and Desktop device
- getClientPayload(): always includes webInfo (no longer skipped for Android)
- Remove unused isAndroidBrowser import from validate-connection.ts
- Update pair code comments documenting tested platform IDs
- Add structured logging to pair code request

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

WAProto/WAProto.proto

@@ -1,7 +1,7 @@
 syntax = "proto3";
 package proto;
 
-/// WhatsApp Version: 2.3000.1034274421
+/// WhatsApp Version: 2.3000.1034293476
 
 message ADVDeviceIdentity {
     optional uint32 rawId = 1;

src/Defaults/baileys-version.json

@@ -1 +1 @@
-{"version":[2,3000,1034279434]}
+{"version":[2,3000,1034300341]}

src/Defaults/index.ts

@@ -56,10 +56,33 @@ export const PROCESSABLE_HISTORY_TYPES = [
 // 6 hours in milliseconds
 const SIX_HOURS_MS = 6 * 60 * 60 * 1000
 
+/**
+ * Resolves the default browser tuple from the BAILEYS_BROWSER env var.
+ * Default: Android companion (SMB_ANDROID) — matches upstream PR #2201.
+ * Pair code auto-detects Android and falls back to Chrome in socket.ts.
+ *
+ *   unset / 'android'    → Browsers.android('14')
+ *   'android:15'         → Browsers.android('15')
+ *   'chrome' / 'macos'   → Browsers.macOS('Chrome')
+ */
+const resolveDefaultBrowser = (): [string, string, string] => {
+	const env = process.env.BAILEYS_BROWSER?.trim().toLowerCase()
+	if (env === 'chrome' || env === 'macos') {
+		return Browsers.macOS('Chrome')
+	}
+
+	if (env?.startsWith('android:')) {
+		const apiLevel = env.split(':')[1] || '14'
+		return Browsers.android(apiLevel)
+	}
+
+	return Browsers.android('14')
+}
+
 export const DEFAULT_CONNECTION_CONFIG: SocketConfig = {
 	version: version as WAVersion,
 	versionCheckIntervalMs: SIX_HOURS_MS,
-	browser: Browsers.macOS('Chrome'),
+	browser: resolveDefaultBrowser(),
 	waWebSocketUrl: 'wss://web.whatsapp.com/ws/chat',
 	connectTimeoutMs: 20_000,
 	keepAliveIntervalMs: 15_000,

src/Socket/socket.ts

@@ -38,7 +38,7 @@ import {
 	signedKeyPair,
 	xmppSignedPreKey
 } from '../Utils'
-import { getPlatformId } from '../Utils/browser-utils'
+import { getPlatformId, isAndroidBrowser } from '../Utils/browser-utils'
 import {
 	CircuitBreaker,
 	CircuitOpenError,
@@ -634,8 +634,6 @@ export const makeSocket = (config: SocketConfig) => {
 		}
 		helloMsg = proto.HandshakeMessage.fromObject(helloMsg)
 
-		logger.info({ browser, helloMsg }, 'connected to WA')
-
 		const init = proto.HandshakeMessage.encode(helloMsg).finish()
 
 		const result = await awaitNextMessage<Uint8Array>(init)
@@ -1352,6 +1350,25 @@ export const makeSocket = (config: SocketConfig) => {
 			id: jidEncode(phoneNumber, 's.whatsapp.net'),
 			name: '~'
 		}
+
+		// Pair code companion_platform_id must be Chrome (1) when using Android
+		// browser preset. ANDROID_PHONE (16) causes silent timeout (server ignores),
+		// UWP (21) causes "cannot connect device" rejection. Only Chrome (1) works
+		// for pair code via web protocol (WA\x06\x03). The device still appears as
+		// "Android" in linked devices because DeviceProps.platformType=ANDROID_PHONE
+		// is set separately in the registration node.
+		const isAndroid = isAndroidBrowser(browser)
+		const pairPlatformId = isAndroid ? getPlatformId('Chrome') : getPlatformId(browser[1])
+		const pairPlatformDisplay = isAndroid ? 'Chrome (Mac OS)' : `${browser[1]} (${browser[0]})`
+
+		logger.info({
+			pairCode: pairingCode,
+			jid: authState.creds.me.id,
+			companionPlatformId: pairPlatformId,
+			companionPlatformDisplay: pairPlatformDisplay,
+			isAndroid,
+		}, `pair code requested | companion: ${pairPlatformDisplay} | ${isAndroid ? 'android override -> Chrome' : 'native platform'}`)
+
 		ev.emit('creds.update', authState.creds)
 		await sendNode({
 			tag: 'iq',
@@ -1384,12 +1401,12 @@ export const makeSocket = (config: SocketConfig) => {
 						{
 							tag: 'companion_platform_id',
 							attrs: {},
-							content: getPlatformId(browser[1])
+							content: pairPlatformId
 						},
 						{
 							tag: 'companion_platform_display',
 							attrs: {},
-							content: `${browser[1]} (${browser[0]})`
+							content: pairPlatformDisplay
 						},
 						{
 							tag: 'link_code_pairing_nonce',
@@ -1519,7 +1536,9 @@ export const makeSocket = (config: SocketConfig) => {
 	})
 	// login complete
 	ws.on('CB:success', async (node: BinaryNode) => {
-		logger.info('opened connection to WA')
+		const isAndroid = isAndroidBrowser(browser)
+		const phoneId = authState.creds.me?.id?.split(':')[0]?.split('@')[0] || 'new session'
+		logger.info(`${isAndroid ? '\uD83D\uDCF1' : '\uD83D\uDDA5\uFE0F'} Connected to WA | ${phoneId} | platform: ${isAndroid ? 'SMB_ANDROID' : 'MACOS'} | device: ${isAndroid ? 'Android' : 'Desktop'} | platformType: ${isAndroid ? 'ANDROID_PHONE' : 'CHROME'}`)
 		clearTimeout(qrTimer) // will never happen in all likelyhood -- but just in case WA sends success on first try
 
 		ev.emit('creds.update', { me: { ...authState.creds.me!, lid: node.attrs.lid } })

src/Types/index.ts

@@ -23,6 +23,7 @@ export type BrowsersMap = {
 	baileys(browser: string): [string, string, string]
 	windows(browser: string): [string, string, string]
 	appropriate(browser: string): [string, string, string]
+	android(apiLevel: string): [string, string, string]
 }
 
 export enum DisconnectReason {

src/Utils/browser-utils.ts

@@ -94,7 +94,13 @@ const BROWSER_TO_PLATFORM_ID: ReadonlyMap<string, string> = (() => {
 		}
 	}
 
-	return new Map(entries)
+	const map = new Map(entries)
+	// ANDROID → ANDROID_PHONE alias (DeviceProps.PlatformType has ANDROID_PHONE but not ANDROID)
+	if (!map.has('ANDROID') && map.has('ANDROID_PHONE')) {
+		map.set('ANDROID', map.get('ANDROID_PHONE')!)
+	}
+
+	return map
 })()
 
 // ============================================================
@@ -331,7 +337,8 @@ export const Browsers: BrowsersMap = {
 	macOS: (browser: string): [string, string, string] => ['Mac OS', browser, OS_VERSIONS.macOS],
 	windows: (browser: string): [string, string, string] => ['Windows', browser, OS_VERSIONS.windows],
 	baileys: (browser: string): [string, string, string] => ['Baileys', browser, OS_VERSIONS.baileys],
-	appropriate: (browser: string): [string, string, string] => [getPlatformName(), browser, getAppropriateVersion()]
+	appropriate: (browser: string): [string, string, string] => [getPlatformName(), browser, getAppropriateVersion()],
+	android: (apiLevel: string): [string, string, string] => [apiLevel, 'Android', '']
 } as const
 
 /**
@@ -378,7 +385,7 @@ export const getPlatformId = (browser: unknown): string => {
  * properties like 'toString' or 'constructor'.
  *
  * @param value - Value to check
- * @returns True if value is a valid browser preset key ('ubuntu', 'macOS', 'windows', 'baileys', 'appropriate')
+ * @returns True if value is a valid browser preset key ('ubuntu', 'macOS', 'windows', 'baileys', 'appropriate', 'android')
  *
  * @example
  * isValidBrowserPreset('ubuntu')      // true
@@ -391,6 +398,16 @@ export const getPlatformId = (browser: unknown): string => {
  *   const config = Browsers[userInput]('MyApp')
  * }
  */
+/**
+ * Checks if the browser tuple represents an Android companion device.
+ *
+ * @param browser - Browser tuple [os, platform, version]
+ * @returns True if platform is 'Android' (case-insensitive)
+ */
+export const isAndroidBrowser = (browser: [string, string, string]): boolean => {
+	return browser[1]?.toUpperCase() === 'ANDROID'
+}
+
 export const isValidBrowserPreset = (value: unknown): value is keyof BrowsersMap => {
 	return typeof value === 'string' && Object.prototype.hasOwnProperty.call(Browsers, value)
 }

src/Utils/validate-connection.ts

@@ -14,6 +14,12 @@ import { encodeBigEndian } from './generics'
 import { createSignalIdentity } from './signal'
 
 const getUserAgent = (config: SocketConfig): proto.ClientPayload.IUserAgent => {
+	// Always use MACOS/Desktop identity for UserAgent — we connect via web
+	// protocol (WA\x06\x03) so the server expects a web-like UserAgent.
+	// Using SMB_ANDROID here causes pair code registration to fail with
+	// "não é possível conectar" even though the phone shows the confirmation.
+	// Android identity is only set in DeviceProps (registration node) which
+	// determines the display name in "Linked Devices".
 	return {
 		appVersion: {
 			primary: config.version[0],
@@ -26,7 +32,6 @@ const getUserAgent = (config: SocketConfig): proto.ClientPayload.IUserAgent => {
 		device: 'Desktop',
 		osBuildNumber: '0.1',
 		localeLanguageIso6391: 'en',
-
 		mnc: '000',
 		mcc: '000',
 		localeCountryIso31661Alpha2: config.countryCode
@@ -55,11 +60,10 @@ const getClientPayload = (config: SocketConfig) => {
 	const payload: proto.IClientPayload = {
 		connectType: proto.ClientPayload.ConnectType.WIFI_UNKNOWN,
 		connectReason: proto.ClientPayload.ConnectReason.USER_ACTIVATED,
-		userAgent: getUserAgent(config)
+		userAgent: getUserAgent(config),
+		webInfo: getWebInfo(config)
 	}
 
-	payload.webInfo = getWebInfo(config)
-
 	return payload
 }
 
@@ -84,6 +88,10 @@ export const generateLoginNode = (userJid: string, config: SocketConfig): proto.
 
 const getPlatformType = (platform: string): proto.DeviceProps.PlatformType => {
 	const platformType = platform.toUpperCase()
+	if (platformType === 'ANDROID') {
+		return proto.DeviceProps.PlatformType.ANDROID_PHONE
+	}
+
 	return (
 		proto.DeviceProps.PlatformType[platformType as keyof typeof proto.DeviceProps.PlatformType] ||
 		proto.DeviceProps.PlatformType.CHROME