fix(signal): align Signal Protocol handling with WABA Android behavior (#257)

7 corrections based on reverse-engineering of WhatsApp Business Android:

1. resolveCanonicalJid: PN→LID resolution for transaction lock keys (prevent race conditions)
2. Retain PN session during LID migration (avoid No Session errors)
3. Delayed PreKey deletion with 5-min grace period (prevent Invalid PreKey ID races)
4. Surgical session cleanup: only delete the specific corrupted device, not all devices
5. Identity dual storage: save identity key in both LID and PN addresses
6. MAC error cooldown reduced 10s→1s (faster recovery, aligned with WABA)
7. Allow session recreation on first retry (retryCount >= 1 instead of > 1)

* fix: remove unused jidDecode import from decode-wa-message.ts
* fix: add try/catch to delayed PreKey deletion to prevent unhandled rejection

The setTimeout async callback in removePreKey could cause unhandled promise
rejection if the keystore was destroyed (connection closed) before the
5-min grace period expired.

WAProto/WAProto.proto

@@ -1,7 +1,7 @@
 syntax = "proto3";
 package proto;
 
-/// WhatsApp Version: 2.3000.1034238531
+/// WhatsApp Version: 2.3000.1034427372
 
 message ADVDeviceIdentity {
     optional uint32 rawId = 1;

src/Defaults/baileys-version.json

@@ -1 +1 @@
-{"version":[2,3000,1034258243]}
+{"version": [2, 3000, 1034427372]}

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,
@@ -67,7 +90,7 @@ export const DEFAULT_CONNECTION_CONFIG: SocketConfig = {
 	emitOwnEvents: true,
 	defaultQueryTimeoutMs: 30_000,
 	customUploadHosts: [],
-	retryRequestDelayMs: 250,
+	retryRequestDelayMs: 150,
 	maxMsgRetryCount: 5,
 	fireInitQueries: true,
 	auth: undefined as unknown as AuthenticationState,
@@ -78,7 +101,7 @@ export const DEFAULT_CONNECTION_CONFIG: SocketConfig = {
 	shouldSyncHistoryMessage: () => true,
 	shouldIgnoreJid: () => false,
 	linkPreviewImageThumbnailWidth: 192,
-	transactionOpts: { maxCommitRetries: 10, delayBetweenTriesMs: 3000 },
+	transactionOpts: { maxCommitRetries: 10, delayBetweenTriesMs: 1000 },
 	generateHighQualityLinkPreview: false,
 	enableAutoSessionRecreation: true,
 	enableRecentMessageCache: true,

src/Signal/libsignal.ts

@@ -302,6 +302,25 @@ export function makeLibSignalRepository(
 	// Promise instead of each spawning their own DB transactions.
 	const migrationInFlight = new Map<string, Promise<{ migrated: number; skipped: number; total: number }>>()
 
+	// Resolve PN JID to its canonical LID JID for transaction locking.
+	// This prevents PN/LID race conditions where concurrent operations for the
+	// same logical contact acquire different mutex locks because one uses PN
+	// and the other uses LID. (Aligned with WABA behavior — all operations use LID internally.)
+	const resolveCanonicalJid = async(jid: string): Promise<string> => {
+		if (isAnyLidUser(jid)) {
+			return jid
+		}
+
+		if (isAnyPnUser(jid)) {
+			const lid = await lidMapping.getLIDForPN(jid)
+			if (lid) {
+				return lid
+			}
+		}
+
+		return jid
+	}
+
 	const repository: SignalRepositoryWithLIDStore = {
 		decryptGroupMessage({ group, authorJid, msg }) {
 			const senderName = jidToSignalSenderKeyName(group, authorJid)
@@ -396,23 +415,24 @@ export function makeLibSignalRepository(
 				return result
 			}
 
-			// If it's not a sync message, we need to ensure atomicity
+			// Use canonical JID (PN→LID resolved) as transaction key to prevent
-			// For regular messages, we use a transaction to ensure atomicity
+			// PN/LID race conditions on the same logical session.
+			const canonicalJid = await resolveCanonicalJid(jid)
 			return parsedKeys.transaction(async () => {
 				return await doDecrypt()
-			}, jid)
+			}, canonicalJid)
 		},
 
 		async encryptMessage({ jid, data }) {
 			const addr = jidToSignalProtocolAddress(jid)
 			const cipher = new libsignal.SessionCipher(storage, addr)
 
-			// Use transaction to ensure atomicity
+			const canonicalJid = await resolveCanonicalJid(jid)
 			return parsedKeys.transaction(async () => {
 				const { type: sigType, body } = await cipher.encrypt(data)
 				const type = sigType === 3 ? 'pkmsg' : 'msg'
 				return { type, ciphertext: Buffer.from(body, 'binary') }
-			}, jid)
+			}, canonicalJid)
 		},
 
 		async encryptGroupMessage({ group, meId, data }) {
@@ -654,9 +674,10 @@ export function makeLibSignalRepository(
 								// Session exists (guaranteed from device discovery)
 								const fromSession = libsignal.SessionRecord.deserialize(pnSession)
 								if (fromSession.haveOpenSession()) {
-									// Queue for bulk update: copy to LID, delete from PN
+									// Queue for bulk update: copy to LID, retain PN session.
+									// WABA retains both PN and LID sessions during migration to avoid
+									// No Session errors if messages arrive via PN before migration completes.
 									sessionUpdates[lidAddrStr] = fromSession.serialize()
-									sessionUpdates[pnAddrStr] = null
 
 									migratedCount++
 								}
@@ -776,6 +797,13 @@ function signalStorage(
 		return id
 	}
 
+	// Delayed PreKey deletion: grace period to handle race conditions
+	// where two pkmsg with the same preKeyId arrive nearly simultaneously.
+	// WABA deletes immediately (33ms), but we add a 5-min grace period
+	// because we can't handle "Invalid PreKey ID" errors at the native level.
+	const PREKEY_GRACE_PERIOD_MS = 5 * 60 * 1000 // 5 minutes
+	const pendingPreKeyDeletions = new Map<string, ReturnType<typeof setTimeout>>()
+
 	return {
 		loadSession: async (id: string) => {
 			try {
@@ -808,7 +836,26 @@ function signalStorage(
 				}
 			}
 		},
-		removePreKey: (id: number) => keys.set({ 'pre-key': { [id]: null } }),
+		removePreKey: (id: number) => {
+			const keyId = id.toString()
+			// Clear any existing timer for this key
+			const existing = pendingPreKeyDeletions.get(keyId)
+			if (existing) {
+				clearTimeout(existing)
+			}
+
+			// Schedule deletion after grace period
+			const timer = setTimeout(async () => {
+				pendingPreKeyDeletions.delete(keyId)
+				try {
+					await keys.set({ 'pre-key': { [id]: null } })
+				} catch {
+					// Keystore may be destroyed if connection closed — safe to ignore
+				}
+			}, PREKEY_GRACE_PERIOD_MS)
+
+			pendingPreKeyDeletions.set(keyId, timer)
+		},
 		loadSignedPreKey: () => {
 			const key = creds.signedPreKey
 			return {
@@ -898,14 +945,24 @@ function signalStorage(
 					// IDENTITY KEY CHANGED - contact reinstalled WhatsApp or switched devices
 					const previousFingerprint = generateKeyFingerprint(existingKey)
 
-					// Delete old session and save new identity key atomically
+					// Delete old session and save new identity key atomically.
+					// Store identity in BOTH LID and PN addresses (WABA stores in both
+					// recipient_account_type=0 and type=1 with CONFLICT_REPLACE).
+					const identityUpdates: Record<string, Uint8Array> = { [wireJid]: identityKey }
+					if (wireJid !== id) {
+						identityUpdates[id] = identityKey
+					}
+
 					await keys.set({
 						session: { [wireJid]: null },
-						'identity-key': { [wireJid]: identityKey }
+						'identity-key': identityUpdates
 					})
 
-					// Update cache
+					// Update cache for both addresses
 					identityKeyCache.set(wireJid, identityKey)
+					if (wireJid !== id) {
+						identityKeyCache.set(id, identityKey)
+					}
 
 					// Record metrics
 					metrics.signalIdentityChanges?.inc({ type: 'changed' })
@@ -941,10 +998,19 @@ function signalStorage(
 
 				if (!existingKey) {
 					// NEW CONTACT - Trust On First Use (TOFU)
-					await keys.set({ 'identity-key': { [wireJid]: identityKey } })
+					// Store in both LID and PN addresses (aligned with WABA dual identity storage)
+					const identityUpdates: Record<string, Uint8Array> = { [wireJid]: identityKey }
+					if (wireJid !== id) {
+						identityUpdates[id] = identityKey
+					}
 
-					// Update cache
+					await keys.set({ 'identity-key': identityUpdates })
+
+					// Update cache for both addresses
 					identityKeyCache.set(wireJid, identityKey)
+					if (wireJid !== id) {
+						identityKeyCache.set(id, identityKey)
+					}
 
 					// Record metrics
 					metrics.signalIdentityChanges?.inc({ type: 'new' })

src/Socket/chats.ts

@@ -50,7 +50,8 @@ import {
 	isMissingKeyError,
 	MAX_SYNC_ATTEMPTS,
 	newLTHashState,
-	processSyncAction
+	processSyncAction,
+	resolveLidToPn
 } from '../Utils'
 import { makeKeyedMutex, makeMutex } from '../Utils/make-mutex'
 import processMessage from '../Utils/process-message'
@@ -102,14 +103,14 @@ export const makeChatsSocket = (config: SocketConfig) => {
 	/** this mutex ensures that messages from the same chat are processed in order, while allowing parallel processing of messages from different chats */
 	const messageMutex = makeKeyedMutex()
 
-	/** this mutex ensures that receipts are processed in order */
+	/** this mutex ensures that receipts from the same chat are processed in order, while allowing parallel processing across chats */
-	const receiptMutex = makeMutex()
+	const receiptMutex = makeKeyedMutex()
 
 	/** this mutex ensures that app state patches are processed in order */
 	const appStatePatchMutex = makeMutex()
 
-	/** this mutex ensures that notifications are processed in order */
+	/** this mutex ensures that notifications from the same chat are processed in order, while allowing parallel processing across chats */
-	const notificationMutex = makeMutex()
+	const notificationMutex = makeKeyedMutex()
 
 	// Timeout for AwaitingInitialSync state
 	let awaitingSyncTimeout: NodeJS.Timeout | undefined
@@ -757,9 +758,16 @@ export const makeChatsSocket = (config: SocketConfig) => {
 			}, authState?.creds?.me?.id || 'resync-app-state')
 
 			const { onMutation } = newAppStateChunkHandler(isInitialSync)
+			const lidMapping = signalRepository.lidMapping
 			for (const key in globalMutationMap) {
 				const mutation = globalMutationMap[key]
 				if (!mutation) continue
+				// Normalize LID→PN in sync action index[1] (chat/contact ID)
+				if (mutation.index[1] && isAnyLidUser(mutation.index[1])) {
+					const resolved = await resolveLidToPn(mutation.index[1], lidMapping, logger)
+					if (resolved) mutation.index[1] = resolved
+				}
+
 				onMutation(mutation)
 			}
 		}
@@ -912,16 +920,16 @@ export const makeChatsSocket = (config: SocketConfig) => {
 		})
 	}
 
-	const handlePresenceUpdate = ({ tag, attrs, content }: BinaryNode) => {
+	const handlePresenceUpdate = async ({ tag, attrs, content }: BinaryNode) => {
 		let presence: PresenceData | undefined
-		const jid = attrs.from
+		const rawJid = attrs.from
-		const participant = attrs.participant || attrs.from
+		const rawParticipant = attrs.participant || attrs.from
-		if (!jid) {
+		if (!rawJid) {
 			logger.warn({ attrs }, 'handlePresenceUpdate: jid (attrs.from) is missing, skipping')
 			return
 		}
 
-		if (shouldIgnoreJid(jid) && jid !== S_WHATSAPP_NET) {
+		if (shouldIgnoreJid(rawJid) && rawJid !== S_WHATSAPP_NET) {
 			return
 		}
 
@@ -933,7 +941,7 @@ export const makeChatsSocket = (config: SocketConfig) => {
 		} else if (Array.isArray(content)) {
 			const [firstChild] = content
 			if (!firstChild) {
-				logger.warn({ jid }, 'handlePresenceUpdate: firstChild content is empty, skipping')
+				logger.warn({ jid: rawJid }, 'handlePresenceUpdate: firstChild content is empty, skipping')
 				return
 			}
 
@@ -952,12 +960,19 @@ export const makeChatsSocket = (config: SocketConfig) => {
 		}
 
 		if (presence) {
-			if (!participant) {
+			if (!rawParticipant) {
-				logger.warn({ jid }, 'handlePresenceUpdate: participant is missing, skipping')
+				logger.warn({ jid: rawJid }, 'handlePresenceUpdate: participant is missing, skipping')
 				return
 			}
 
-			ev.emit('presence.update', { id: jid, presences: { [participant]: presence } })
+			// Resolve LID→PN so consumers always see phone-number JIDs
+			const lidMapping = signalRepository.lidMapping
+			const [jid, participant] = await Promise.all([
+				resolveLidToPn(rawJid, lidMapping, logger),
+				resolveLidToPn(rawParticipant, lidMapping, logger)
+			])
+
+			ev.emit('presence.update', { id: jid!, presences: { [participant!]: presence } })
 		}
 	}
 
@@ -1031,8 +1046,16 @@ export const makeChatsSocket = (config: SocketConfig) => {
 				undefined,
 				logger
 			)
+			const lidMapping = signalRepository.lidMapping
 			for (const key in mutationMap) {
-				onMutation(mutationMap[key]!)
+				const mutation = mutationMap[key]!
+				// Normalize LID→PN in sync action index[1] (chat/contact ID)
+				if (mutation.index[1] && isAnyLidUser(mutation.index[1])) {
+					const resolved = await resolveLidToPn(mutation.index[1], lidMapping, logger)
+					if (resolved) mutation.index[1] = resolved
+				}
+
+				onMutation(mutation)
 			}
 		}
 	}
@@ -1376,8 +1399,12 @@ export const makeChatsSocket = (config: SocketConfig) => {
 		}
 	})
 
-	ws.on('CB:presence', handlePresenceUpdate)
+	ws.on('CB:presence', (node: BinaryNode) => {
-	ws.on('CB:chatstate', handlePresenceUpdate)
+		handlePresenceUpdate(node).catch(err => onUnexpectedError(err, 'handling presence update'))
+	})
+	ws.on('CB:chatstate', (node: BinaryNode) => {
+		handlePresenceUpdate(node).catch(err => onUnexpectedError(err, 'handling chatstate update'))
+	})
 
 	ws.on('CB:ib,,dirty', async (node: BinaryNode) => {
 		const { attrs } = getBinaryNodeChild(node, 'dirty')!
@@ -1495,7 +1522,7 @@ export const makeChatsSocket = (config: SocketConfig) => {
 
 		awaitingSyncTimeout = setTimeout(() => {
 			if (syncState === SyncState.AwaitingInitialSync) {
-				logger.warn('Timeout in AwaitingInitialSync (4s), forcing state to Online and flushing buffer')
+				logger.warn('Timeout in AwaitingInitialSync (2s), forcing state to Online and flushing buffer')
 				syncState = SyncState.Online
 				ev.flush()
 
@@ -1505,7 +1532,7 @@ export const makeChatsSocket = (config: SocketConfig) => {
 				const accountSyncCounter = (authState.creds.accountSyncCounter || 0) + 1
 				ev.emit('creds.update', { accountSyncCounter })
 			}
-		}, 4_000)
+		}, 2_000)
 	})
 
 	// When an app state sync key arrives (myAppStateKeyId is set) and there are

src/Socket/groups.ts

@@ -1,7 +1,7 @@
 import { proto } from '../../WAProto/index.js'
 import type { GroupMetadata, GroupParticipant, ParticipantAction, SocketConfig, WAMessageKey } from '../Types'
 import { WAMessageAddressingMode, WAMessageStubType } from '../Types'
-import { generateMessageIDV2, unixTimestampSeconds } from '../Utils'
+import { generateMessageIDV2, resolveLidToPn, unixTimestampSeconds } from '../Utils'
 import {
 	type BinaryNode,
 	getBinaryNodeChild,
@@ -17,6 +17,43 @@ import { makeChatsSocket } from './chats'
 export const makeGroupsSocket = (config: SocketConfig) => {
 	const sock = makeChatsSocket(config)
 	const { authState, ev, query, upsertMessage } = sock
+	const { signalRepository } = sock
+	const { logger } = config
+
+	/** Normalize group metadata participant IDs from LID to PN */
+	const normalizeGroupMetadata = async (metadata: GroupMetadata): Promise<GroupMetadata> => {
+		const lidMapping = signalRepository.lidMapping
+
+		// Resolve all participant LIDs in parallel for better performance on large groups
+		await Promise.all(metadata.participants.map(async (p) => {
+			if (isLidUser(p.id)) {
+				if (p.phoneNumber) {
+					p.lid = p.id
+					p.id = p.phoneNumber
+				} else {
+					const resolved = await resolveLidToPn(p.id, lidMapping, logger)
+					if (resolved && resolved !== p.id) {
+						p.lid = p.id
+						p.id = resolved
+					}
+				}
+			}
+		}))
+
+		// Normalize owner/subjectOwner if LID (parallel)
+		const [resolvedOwner, resolvedSubjectOwner] = await Promise.all([
+			metadata.owner && isLidUser(metadata.owner)
+				? (metadata.ownerPn || resolveLidToPn(metadata.owner, lidMapping, logger))
+				: null,
+			metadata.subjectOwner && isLidUser(metadata.subjectOwner)
+				? (metadata.subjectOwnerPn || resolveLidToPn(metadata.subjectOwner, lidMapping, logger))
+				: null
+		])
+		if (resolvedOwner) metadata.owner = resolvedOwner
+		if (resolvedSubjectOwner) metadata.subjectOwner = resolvedSubjectOwner
+
+		return metadata
+	}
 
 	const groupQuery = async (jid: string, type: 'get' | 'set', content: BinaryNode[]) =>
 		query({
@@ -31,7 +68,7 @@ export const makeGroupsSocket = (config: SocketConfig) => {
 
 	const groupMetadata = async (jid: string) => {
 		const result = await groupQuery(jid, 'get', [{ tag: 'query', attrs: { request: 'interactive' } }])
-		return extractGroupMetadata(result)
+		return normalizeGroupMetadata(extractGroupMetadata(result))
 	}
 
 	const groupFetchAllParticipating = async () => {
@@ -58,16 +95,15 @@ export const makeGroupsSocket = (config: SocketConfig) => {
 		if (groupsChild) {
 			const groups = getBinaryNodeChildren(groupsChild, 'group')
 			for (const groupNode of groups) {
-				const meta = extractGroupMetadata({
+				const meta = await normalizeGroupMetadata(extractGroupMetadata({
 					tag: 'result',
 					attrs: {},
 					content: [groupNode]
-				})
+				}))
 				data[meta.id] = meta
 			}
 		}
 
-		// TODO: properly parse LID / PN DATA
 		sock.ev.emit('groups.update', Object.values(data))
 
 		return data
@@ -101,7 +137,7 @@ export const makeGroupsSocket = (config: SocketConfig) => {
 					}))
 				}
 			])
-			return extractGroupMetadata(result)
+			return normalizeGroupMetadata(extractGroupMetadata(result))
 		},
 		groupLeave: async (id: string) => {
 			await groupQuery('@g.us', 'set', [
@@ -277,7 +313,7 @@ export const makeGroupsSocket = (config: SocketConfig) => {
 		),
 		groupGetInviteInfo: async (code: string) => {
 			const results = await groupQuery('@g.us', 'get', [{ tag: 'invite', attrs: { code } }])
-			return extractGroupMetadata(results)
+			return normalizeGroupMetadata(extractGroupMetadata(results))
 		},
 		groupToggleEphemeral: async (jid: string, ephemeralExpiration: number) => {
 			const content: BinaryNode = ephemeralExpiration

src/Socket/messages-send.ts

@@ -1611,6 +1611,8 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 
 						// Persist senderTimestamp unconditionally — WA Web stores it in the chat table
 						// regardless of whether a token exists. Spread preserves token+timestamp if present.
+						// WABA Android: INSERT INTO wa_trusted_contacts_send (jid, sent_tc_token_timestamp, real_issue_timestamp)
+						// VALUES (?, ?, 0) — realIssueTimestamp=0 means issued but not yet confirmed by server
 						const currentData = await authState.keys.get('tctoken', [tcTokenJid])
 						const currentEntry = currentData[tcTokenJid]
 						await authState.keys.set({
@@ -1618,7 +1620,8 @@ export const makeMessagesSocket = (config: SocketConfig) => {
 								[tcTokenJid]: {
 									...currentEntry,
 									token: currentEntry?.token ?? Buffer.alloc(0),
-									senderTimestamp: issueTimestamp
+									senderTimestamp: issueTimestamp,
+									realIssueTimestamp: 0
 								}
 							}
 						})

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 } })
@@ -1667,8 +1686,8 @@ export const makeSocket = (config: SocketConfig) => {
 	// already-authenticated session (no QR re-scan needed). In this case we skip
 	// the offline buffer entirely so live messages are not held hostage waiting for the
 	// server to finish flushing the pending-message backlog (CB:ib,,offline).
-	// For normal restarts (no stale routingInfo) the standard 5 s safety cap applies.
+	// For normal restarts (no stale routingInfo) the standard 2 s safety cap applies.
-	const OFFLINE_BUFFER_TIMEOUT_MS = 5_000
+	const OFFLINE_BUFFER_TIMEOUT_MS = 2_000
 	let offlineBufferTimeout: NodeJS.Timeout | undefined
 
 	process.nextTick(() => {

src/Types/Auth.ts

@@ -80,7 +80,7 @@ export type SignalDataTypeMap = {
 	'app-state-sync-version': LTHashState
 	'lid-mapping': string
 	'device-list': string[]
-	tctoken: { token: Buffer; timestamp?: string; senderTimestamp?: number }
+	tctoken: { token: Buffer; timestamp?: string; senderTimestamp?: number; realIssueTimestamp?: number | null }
 	/** Identity key for Signal Protocol - used for detecting contact reinstalls */
 	'identity-key': Uint8Array
 }

src/Types/Call.ts

@@ -1,4 +1,30 @@
-export type WACallUpdateType = 'offer' | 'ringing' | 'timeout' | 'reject' | 'accept' | 'terminate'
+export type WACallUpdateType =
+	| 'offer'
+	| 'ringing'
+	| 'timeout'
+	| 'reject'
+	| 'accept'
+	| 'terminate'
+	| 'preaccept'
+	| 'transport'
+	| 'relaylatency'
+	| 'group_update'
+	| 'reminder'
+	| 'heartbeat'
+	| 'mute_v2'
+	| 'enc_rekey'
+	| 'video'
+	| 'relay'
+
+export type WACallParticipant = {
+	jid?: string
+	/** 'connected' | 'invited' | 'left' etc. */
+	state?: string
+	/** Phone number in s.whatsapp.net format */
+	userPn?: string
+	/** 'admin' for group call link creator */
+	type?: string
+}
 
 export type WACallEvent = {
 	chatId: string
@@ -13,4 +39,20 @@ export type WACallEvent = {
 	latencyMs?: number
 	/** Phone number of the caller (sanitized to fix Brazilian landline bug) */
 	callerPn?: string
+	/** Call link token (forms URL: https://call.whatsapp.com/video/<token>) */
+	linkToken?: string
+	/** JID of who created the call link */
+	linkCreator?: string
+	/** Phone number of link creator */
+	linkCreatorPn?: string
+	/** Media type: 'video' or 'audio' */
+	media?: string
+	/** Max participants for group/link calls */
+	connectedLimit?: number
+	/** Participants in a group/link call */
+	participants?: WACallParticipant[]
+	/** Call duration in ms (from terminate/call_summary) */
+	duration?: number
+	/** Terminate reason (e.g. 'group_call_ended', 'accepted_elsewhere', 'timeout') */
+	terminateReason?: string
 }

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/decode-wa-message.ts

@@ -14,7 +14,6 @@ import {
 	isJidStatusBroadcast,
 	isLidUser,
 	isPnUser,
-	jidDecode
 	//	transferDevice
 } from '../WABinary'
 import { unpadRandomMax16 } from './generics'
@@ -276,7 +275,6 @@ export const decryptMessageNode = (
 	meLid: string,
 	repository: SignalRepositoryWithLIDStore,
 	logger: ILogger,
-	autoCleanCorrupted = true
 ) => {
 	const { fullMessage, author, sender } = decodeMessageNode(stanza, meId, meLid)
 	return {
@@ -422,34 +420,19 @@ export const decryptMessageNode = (
 							if (isRetryExhausted) {
 								logger.error(
 									errorContext,
-									`⚠️ Session corrupted and recovery failed after ${err.attempts} attempts. Auto-cleanup will attempt to recover.`
+									`⚠️ Session corrupted after ${err.attempts} attempts. Retry+pkmsg flow will recover.`
 								)
 							} else {
 								// First occurrence - log as warning since auto-recovery will attempt
 								logger.warn(errorContext, '⚠️ Corrupted session detected - attempting auto-recovery')
 							}
 
-							// Automatic cleanup of corrupted session (if enabled)
+							// Session cleanup is deferred to retry exhaustion (safety net).
-							// eslint-disable-next-line max-depth
+							// The Signal Protocol handles recovery naturally via retry+pkmsg:
-							if (autoCleanCorrupted) {
+							// Bad MAC -> retry receipt -> sender re-sends as pkmsg -> new session.
-								// eslint-disable-next-line max-depth
+							// Deleting sessions here (hot path) causes cascading failures when
-								try {
+							// multiple messages from the same contact arrive simultaneously.
-									const deletedCount = await cleanupCorruptedSession(decryptionJid, repository, logger)
+							// See: messages-recv.ts sendRetryRequest() for deferred cleanup.
-
-									// Mask only user portion of JID for privacy (preserve domain info)
-									const { user, server } = jidDecode(decryptionJid) || {}
-									const maskedUser =
-										user && user.length > 8 ? `${user.substring(0, 4)}****${user.substring(user.length - 4)}` : user
-									const maskedJid = maskedUser && server ? `${maskedUser}@${server}` : decryptionJid
-
-									logger.info(
-										{ jid: decryptionJid, maskedJid, targetedDevices: deletedCount },
-										`🔄 Session Reset | JID: ${maskedJid} | Targeted: ${deletedCount} devices | Will recreate on next message`
-									)
-								} catch (cleanupErr) {
-									logger.error({ decryptionJid, err: cleanupErr }, '❌ Failed to cleanup corrupted session')
-								}
-							}
 						} else if (isSessionRecord) {
 							// Session record errors are transient - retry should handle them
 							// eslint-disable-next-line max-depth
@@ -504,53 +487,20 @@ export function isCorruptedSessionError(error: any): boolean {
 }
 
 /**
- * Clean up corrupted session by deleting all device sessions for a JID
+ * Clean up corrupted session for a specific device JID.
- * Signal Protocol will automatically recreate the session on next message
+ * WABA behavior: DELETE sessions WHERE recipient_id=? AND device_id=?
+ * Only deletes the exact device that was corrupted, not all devices.
+ *
+ * NOTE: This should NOT be called on every Bad MAC error (hot path).
+ * Instead, let the retry+pkmsg flow handle recovery naturally (like WhatsApp does).
+ * Only call this as a safety net when retries are exhausted.
  */
-async function cleanupCorruptedSession(
+export async function cleanupCorruptedSession(
 	jid: string,
 	repository: SignalRepositoryWithLIDStore,
 	logger: ILogger
 ): Promise<number> {
-	const { user, device } = jidDecode(jid) || {}
+	await repository.deleteSession([jid])
-	if (!user) {
+	logger.info({ jid }, 'Cleaned up corrupted session for specific device')
-		logger.warn({ jid }, 'Cannot cleanup session - invalid JID')
+	return 1
-		return 0
-	}
-
-	// Build list of JIDs to delete (primary + secondary devices)
-	const jidsToDelete: string[] = []
-
-	// Determine domain type correctly (handle hosted JIDs)
-	// JID formats:
-	//   - PN: user@s.whatsapp.net
-	//   - LID: user@lid
-	//   - Hosted PN: user@hosted
-	//   - Hosted LID: user@hosted.lid
-	const isLID = jid.endsWith('@lid') || jid.endsWith('@hosted.lid')
-	const isHosted = jid.includes('@hosted')
-
-	let domain: string
-	if (isLID) {
-		domain = isHosted ? 'hosted.lid' : 'lid'
-	} else {
-		domain = isHosted ? 'hosted' : 's.whatsapp.net'
-	}
-
-	// Primary device (0)
-	jidsToDelete.push(`${user}@${domain}`)
-
-	// Secondary devices (1-5 common range for Web/Desktop/etc)
-	for (let i = 1; i <= 5; i++) {
-		jidsToDelete.push(`${user}:${i}@${domain}`)
-	}
-
-	// If specific device was identified and > 5, ensure it's included
-	if (device !== undefined && device > 5) {
-		jidsToDelete.push(`${user}:${device}@${domain}`)
-	}
-
-	await repository.deleteSession(jidsToDelete)
-
-	return jidsToDelete.length
 }

src/Utils/event-buffer.ts

@@ -54,15 +54,15 @@ export interface BufferConfig {
  */
 export function loadBufferConfig(): BufferConfig {
 	return {
-		// perf(inbound-latency): reduced from 15s → 5s so the safety auto-flush fires sooner.
+		// perf(inbound-latency): reduced from 15s → 3s so the safety auto-flush fires sooner.
 		// processNodeWithBuffer always calls ev.flush() explicitly (no-op for this timer),
 		// but socket.ts's offline-phase buffer and any stalled buffer benefit from the lower cap.
-		bufferTimeoutMs: parseInt(process.env.BAILEYS_BUFFER_TIMEOUT_MS || '5000', 10),
+		bufferTimeoutMs: parseInt(process.env.BAILEYS_BUFFER_TIMEOUT_MS || '3000', 10),
 		minBufferTimeoutMs: parseInt(process.env.BAILEYS_BUFFER_MIN_TIMEOUT_MS || '1000', 10),
-		maxBufferTimeoutMs: parseInt(process.env.BAILEYS_BUFFER_MAX_TIMEOUT_MS || '8000', 10),
+		maxBufferTimeoutMs: parseInt(process.env.BAILEYS_BUFFER_MAX_TIMEOUT_MS || '3000', 10),
 		maxHistoryCacheSize: parseInt(process.env.BAILEYS_BUFFER_MAX_HISTORY_CACHE || '10000', 10),
 		maxBufferSize: parseInt(process.env.BAILEYS_BUFFER_MAX_SIZE || '5000', 10),
-		flushDebounceMs: parseInt(process.env.BAILEYS_BUFFER_FLUSH_DEBOUNCE_MS || '100', 10),
+		flushDebounceMs: parseInt(process.env.BAILEYS_BUFFER_FLUSH_DEBOUNCE_MS || '10', 10),
 		enableAdaptiveTimeout: process.env.BAILEYS_BUFFER_ADAPTIVE_TIMEOUT !== 'false',
 		enableMetrics: process.env.BAILEYS_BUFFER_METRICS === 'true' || process.env.BAILEYS_PROMETHEUS_ENABLED === 'true',
 		lruCleanupRatio: parseFloat(process.env.BAILEYS_BUFFER_LRU_CLEANUP_RATIO || '0.2'),

src/Utils/generics.ts

@@ -429,6 +429,36 @@ export const getCallStatusFromNode = ({ tag, attrs }: BinaryNode) => {
 		case 'accept':
 			status = 'accept'
 			break
+		case 'preaccept':
+			status = 'preaccept'
+			break
+		case 'transport':
+			status = 'transport'
+			break
+		case 'relaylatency':
+			status = 'relaylatency'
+			break
+		case 'group_update':
+			status = 'group_update'
+			break
+		case 'reminder':
+			status = 'reminder'
+			break
+		case 'heartbeat':
+			status = 'heartbeat'
+			break
+		case 'mute_v2':
+			status = 'mute_v2'
+			break
+		case 'enc_rekey':
+			status = 'enc_rekey'
+			break
+		case 'video':
+			status = 'video'
+			break
+		case 'relay':
+			status = 'relay'
+			break
 		default:
 			status = 'ringing'
 			break

src/Utils/message-retry-manager.ts

@@ -211,15 +211,33 @@ export class MessageRetryManager {
 			}
 		}
 
-		// MAC errors require IMMEDIATE session recreation regardless of history
+		// MAC errors require session recreation, but rate-limited to prevent loops.
-		// This handles the case where contact reinstalled WhatsApp (identity key changed)
+		// When multiple messages fail with Bad MAC simultaneously, only the first
+		// should trigger recreation; subsequent ones within the cooldown window
+		// piggyback on the same new session established by the retry+pkmsg flow.
 		if (errorCode !== undefined && MAC_ERROR_CODES.has(errorCode)) {
-			this.sessionRecreateHistory.set(jid, Date.now())
+			const now = Date.now()
+			const prevTime = this.sessionRecreateHistory.get(jid)
+			const MAC_ERROR_COOLDOWN_MS = 1_000 // 1 second — WABA recovers faster
+
+			if (prevTime && now - prevTime < MAC_ERROR_COOLDOWN_MS) {
+				const reasonName = RetryReason[errorCode] || `code_${errorCode}`
+				this.logger.debug(
+					{ jid, errorCode: reasonName, msSinceLast: now - prevTime },
+					'MAC error session recreation skipped — cooldown active'
+				)
+				return {
+					reason: '',
+					recreate: false
+				}
+			}
+
+			this.sessionRecreateHistory.set(jid, now)
 			this.statistics.sessionRecreations++
 			const reasonName = RetryReason[errorCode] || `code_${errorCode}`
 			metrics.signalMacErrors?.inc({ action: 'session_recreation' })
 			metrics.signalSessionRecreations?.inc({ reason: 'mac_error' })
-			this.logger.warn({ jid, errorCode: reasonName }, 'MAC error detected, forcing immediate session recreation')
+			this.logger.warn({ jid, errorCode: reasonName }, 'MAC error detected, recreating session')
 			return {
 				reason: `MAC error (${reasonName}) - contact may have reinstalled WhatsApp`,
 				recreate: true

src/Utils/process-message.ts

@@ -19,10 +19,13 @@ import type {
 	WAMessage,
 	WAMessageKey
 } from '../Types'
+import type { LIDMappingStore } from '../Signal/lid-mapping'
 import { WAMessageStubType } from '../Types'
 import { getContentType, normalizeMessageContent } from '../Utils/messages'
 import {
 	areJidsSameUser,
+	isAnyLidUser,
+	isAnyPnUser,
 	isHostedLidUser,
 	isHostedPnUser,
 	isJidBroadcast,
@@ -113,8 +116,63 @@ export const cleanMessage = (message: WAMessage, meId: string, meLid: string) =>
 			msgKey.remoteJid = message.key.remoteJid
 			// set participant of the message
 			msgKey.participant = msgKey.participant || message.key.participant
+		} else {
+			// fromMe reactions/polls: normalise remoteJid to match the chat JID
+			// ensures DM reaction keys are consistent with group behavior
+			msgKey.remoteJid = message.key.remoteJid
+			// in groups, normalise participant for own messages too
+			if (message.key.participant) {
+				msgKey.participant = msgKey.participant || message.key.participant
 			}
 		}
+	}
+}
+
+/**
+ * Resolves a LID JID to its PN equivalent using the LID mapping store.
+ * Returns the original JID if it's not a LID or if no mapping is found.
+ * Safe to call with any JID type (group, newsletter, PN, etc.).
+ */
+export const resolveLidToPn = async (
+	jid: string | undefined | null,
+	lidMapping: LIDMappingStore,
+	logger?: ILogger
+): Promise<string | undefined> => {
+	if (!jid) {
+		return undefined
+	}
+
+	if (isAnyLidUser(jid)) {
+		const pn = await lidMapping.getPNForLID(jid)
+		if (pn) {
+			logger?.debug({ lid: jid, pn }, 'Resolved LID to PN')
+		}
+
+		return pn || jid
+	}
+
+	return jid
+}
+
+/**
+ * Normalizes a WAMessageKey by resolving LID→PN for remoteJid and participant.
+ */
+export const normalizeKeyLidToPn = async (
+	key: WAMessageKey,
+	lidMapping: LIDMappingStore,
+	logger?: ILogger
+): Promise<void> => {
+	const [resolvedRemoteJid, resolvedParticipant] = await Promise.all([
+		resolveLidToPn(key.remoteJid, lidMapping, logger),
+		resolveLidToPn(key.participant, lidMapping, logger)
+	])
+	if (resolvedRemoteJid) {
+		key.remoteJid = resolvedRemoteJid
+	}
+
+	if (resolvedParticipant) {
+		key.participant = resolvedParticipant
+	}
 }
 
 export const normalizeMessageJids = async (
@@ -122,37 +180,42 @@ export const normalizeMessageJids = async (
 	signalRepository: SignalRepositoryWithLIDStore,
 	logger?: ILogger
 ): Promise<void> => {
-	const resolveLidToPn = async (jid: string | undefined | null): Promise<string | undefined> => {
+	const lidMapping = signalRepository.lidMapping
-		if (!jid) {
+	const key = message.key
-			return undefined
+
+	// FAST PATH: Use alt JIDs directly when available (avoids LIDMappingStore race condition).
+	// The stanza always carries both formats (LID + PN) in the attributes.
+	// When addressing_mode=lid, remoteJid is LID and remoteJidAlt is PN.
+	// When addressing_mode=pn, remoteJid is already PN (no conversion needed).
+	if (key.remoteJid && isAnyLidUser(key.remoteJid) && key.remoteJidAlt && isAnyPnUser(key.remoteJidAlt)) {
+		logger?.debug({ lid: key.remoteJid, pn: key.remoteJidAlt }, 'Resolved remoteJid LID→PN via alt (fast path)')
+		key.remoteJid = key.remoteJidAlt
 	}
 
-		if (isLidUser(jid) || isHostedLidUser(jid)) {
+	if (key.participant && isAnyLidUser(key.participant) && key.participantAlt && isAnyPnUser(key.participantAlt)) {
-			const pn = await signalRepository.lidMapping.getPNForLID(jid)
+		logger?.debug({ lid: key.participant, pn: key.participantAlt }, 'Resolved participant LID→PN via alt (fast path)')
-			if (pn) {
+		key.participant = key.participantAlt
-				logger?.debug({ lid: jid, pn }, 'Resolved LID to PN for inbound message')
-			} else {
-				logger?.debug({ lid: jid }, 'PN not found for inbound LID, keeping LID')
 	}
 
-			return pn || jid
+	// SLOW PATH: Resolve any remaining LIDs via LIDMappingStore lookup
+	await normalizeKeyLidToPn(key, lidMapping, logger)
+
+	// Also normalize participantAlt (the alternative JID format — can be LID when addressing_mode=pn)
+	if (key.participantAlt && isAnyLidUser(key.participantAlt)) {
+		const resolved = await resolveLidToPn(key.participantAlt, lidMapping, logger)
+		if (resolved) {
+			key.participantAlt = resolved
+		}
 	}
 
-		return jid
+	// Normalize nested message keys (reaction, poll) that may contain LID JIDs
+	const content = normalizeMessageContent(message.message)
+	if (content?.reactionMessage?.key) {
+		await normalizeKeyLidToPn(content.reactionMessage.key, lidMapping, logger)
 	}
 
-	// Execute both lookups in parallel instead of sequentially to reduce latency
+	if (content?.pollUpdateMessage?.pollCreationMessageKey) {
-	const [resolvedRemoteJid, resolvedParticipant] = await Promise.all([
+		await normalizeKeyLidToPn(content.pollUpdateMessage.pollCreationMessageKey, lidMapping, logger)
-		resolveLidToPn(message.key.remoteJid),
-		resolveLidToPn(message.key.participant)
-	])
-
-	if (resolvedRemoteJid) {
-		message.key.remoteJid = resolvedRemoteJid
-	}
-
-	if (resolvedParticipant) {
-		message.key.participant = resolvedParticipant
 	}
 }
 
@@ -526,6 +589,12 @@ const processMessage = async (
 								'CTWA: Successfully recovered message via placeholder resend'
 							)
 
+							// Normalize LID→PN in PDO-recovered message key before emitting
+							// eslint-disable-next-line max-depth
+							if (webMessageInfo.key && signalRepository) {
+								await normalizeKeyLidToPn(webMessageInfo.key as WAMessageKey, signalRepository.lidMapping, logger)
+							}
+
 							// wait till another upsert event is available, don't want it to be part of the PDO response message
 							// TODO: parse through proper message handling utilities (to add relevant key fields)
 							ev.emit('messages.upsert', {
@@ -666,9 +735,13 @@ const processMessage = async (
 						response: responseMsg
 					}
 
+					// Normalize creationMsgKey JIDs for the emitted event
+					const normalizedCreationKey = { ...creationMsgKey }
+					await normalizeKeyLidToPn(normalizedCreationKey, signalRepository.lidMapping, logger)
+
 					ev.emit('messages.update', [
 						{
-							key: creationMsgKey,
+							key: normalizedCreationKey,
 							update: {
 								eventResponses: [eventResponse]
 							}
@@ -711,7 +784,7 @@ const processMessage = async (
 			})
 		}
 
-		const participantsIncludesMe = () => participants.find(jid => areJidsSameUser(meId, jid.phoneNumber)) // ADD SUPPORT FOR LID
+		const participantsIncludesMe = () => participants.find(p => areJidsSameUser(meId, p.id) || areJidsSameUser(meId, p.phoneNumber))
 
 		switch (message.messageStubType) {
 			case WAMessageStubType.GROUP_PARTICIPANT_CHANGE_NUMBER:

src/Utils/tc-token-utils.ts

@@ -159,7 +159,10 @@ export async function storeTcTokensFromIqResult({
 				[storageJid]: {
 					...existingEntry,
 					token: Buffer.from(tokenNode.content),
-					timestamp: tokenNode.attrs.t
+					timestamp: tokenNode.attrs.t,
+					// WABA Android: resets real_issue_timestamp to null when storing a new token
+					// (UPDATE wa_trusted_contacts_send SET real_issue_timestamp=null)
+					realIssueTimestamp: null
 				}
 			}
 		})

src/Utils/validate-connection.ts

@@ -14,19 +14,24 @@ 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],
 			secondary: config.version[1],
 			tertiary: config.version[2]
 		},
-		platform: proto.ClientPayload.UserAgent.Platform.WEB,
+		platform: proto.ClientPayload.UserAgent.Platform.MACOS,
 		releaseChannel: proto.ClientPayload.UserAgent.ReleaseChannel.RELEASE,
 		osVersion: '0.1',
 		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

src/__tests__/Socket/offline-buffer-timeout.test.ts

@@ -20,7 +20,7 @@ import { jest } from '@jest/globals'
  * bad-ack-handling.test.ts.
  */
 
-const OFFLINE_BUFFER_TIMEOUT_MS = 5_000
+const OFFLINE_BUFFER_TIMEOUT_MS = 2_000
 
 /** Mirrors the state variables declared at the top of makeSocket */
 interface OfflineBufferState {
@@ -101,10 +101,10 @@ describe('offline-buffer safety timer (socket.ts)', () => {
 	})
 
 	// -------------------------------------------------------------------------
-	// 1. Timeout path — CB:ib,,offline never arrives within 5 s
+	// 1. Timeout path — CB:ib,,offline never arrives within 2 s
 	// -------------------------------------------------------------------------
 
-	it('fires after 5 s and flushes when CB:ib,,offline is delayed', () => {
+	it('fires after 2 s and flushes when CB:ib,,offline is delayed', () => {
 		startBuffer(state, mockFlush, mockWarn)
 
 		expect(mockFlush).not.toHaveBeenCalled()
@@ -144,17 +144,17 @@ describe('offline-buffer safety timer (socket.ts)', () => {
 	})
 
 	// -------------------------------------------------------------------------
-	// 2. Happy path — CB:ib,,offline arrives before the 5 s timer fires
+	// 2. Happy path — CB:ib,,offline arrives before the 2 s timer fires
 	// -------------------------------------------------------------------------
 
 	it('CB:ib,,offline cancels the timer and flushes exactly once', () => {
 		startBuffer(state, mockFlush, mockWarn)
 
-		// Server responds before the 5 s timeout
+		// Server responds before the 2 s timeout
 		jest.advanceTimersByTime(1_000)
 		onOffline(state, mockFlush)
 
-		// Timer should be cancelled — advancing past 5 s must not cause a second flush
+		// Timer should be cancelled — advancing past 2 s must not cause a second flush
 		jest.advanceTimersByTime(OFFLINE_BUFFER_TIMEOUT_MS)
 
 		expect(mockFlush).toHaveBeenCalledTimes(1)
@@ -192,7 +192,7 @@ describe('offline-buffer safety timer (socket.ts)', () => {
 
 		onClose(state)
 
-		// Timer must be gone — advancing past 5 s must not trigger any flush
+		// Timer must be gone — advancing past 2 s must not trigger any flush
 		jest.advanceTimersByTime(OFFLINE_BUFFER_TIMEOUT_MS)
 
 		expect(mockFlush).not.toHaveBeenCalled()
@@ -236,7 +236,7 @@ describe('offline-buffer safety timer (socket.ts)', () => {
 	// 4. Boundary / timing edge cases
 	// -------------------------------------------------------------------------
 
-	it('does not flush before exactly 5 s have elapsed', () => {
+	it('does not flush before exactly 2 s have elapsed', () => {
 		startBuffer(state, mockFlush, mockWarn)
 
 		jest.advanceTimersByTime(OFFLINE_BUFFER_TIMEOUT_MS - 1)
@@ -244,7 +244,7 @@ describe('offline-buffer safety timer (socket.ts)', () => {
 		expect(mockFlush).not.toHaveBeenCalled()
 	})
 
-	it('flushes at exactly the 5 s boundary', () => {
+	it('flushes at exactly the 2 s boundary', () => {
 		startBuffer(state, mockFlush, mockWarn)
 
 		jest.advanceTimersByTime(OFFLINE_BUFFER_TIMEOUT_MS)