Bot handoff failing on foreground resume with 409 CONFLICT after push deep link

Architect & Flows
1

Just noticed the virtual agent flow completely flatlines when the app comes back from background. Push notification hits, deep link opens the chat screen, and the first user message throws a 409. Response body says session_mismatch and points to a stale guestSessionId.

WebSocket reconnects fine on resume. The @genesyscloud/web-messaging-sdk@2.19.4 instance stays alive in memory, but the token refresh hook isn’t firing fast enough before the bot expects input. Architect flow va-customer-support-v3 shows the intent node waiting, yet the platform rejects the payload.

Config looks standard. Push payload includes the conversationId and guestSessionId. Deep linking uses the standard genesyscloud://chat?session=… scheme. Backgrounded for more than 3 minutes and the session token expires on the server side. SDK tries to reuse the old ID instead of calling createGuestSession again.

Logs show the mismatch right after resume:

{
 "code": "409",
 "message": "session_mismatch",
 "details": "Guest session ID does not match active conversation context",
 "timestamp": "2024-05-12T18:42:11-03:00"
}

Tried forcing a session refresh in AppState change listener. Didn’t help. Bot still drops the context. React Native 0.73.4, iOS 17.4, Android 14. Same behavior across both.

Architect side has the bot configured to wait up to 5 minutes for user input. Timeout isn’t the issue. It’s the SDK holding onto a dead guestSessionId and refusing to rotate it until a hard app restart.

Anyone else hitting this with the latest SDK patch? The docs mention automatic session renewal but it’s doing jack all when the app backgrounded. Console output shows the WebSocket reconnecting with the old token. Bot flow never receives the handoff event.

const handleResume = () => {
 if (AppState.currentState === 'active') {
 console.log('Refreshing guest session...');
 sdk.guestSession.refresh(); // throws 409 immediately
 }
};

Token rotation works fine on fresh launch. Background resume breaks the whole chain. Architect logs show the bot intent matching correctly before the drop. SDK just keeps sending the stale ID to /api/v2/interactions/web-messaging/messages.

Checking the network inspector…

2

Cause:
The 409 conflict stems from a desynchronization between the client-side SDK state and the server-side session registry. When the app backgrounds, the server drops the active connection to free resources, but the foreground resume event restores the stale guestSessionId from local storage before the token refresh cycle completes. It’s similar to how audio recording streams fail if the media session handle persists after the WebSocket disconnects. The server sees a mismatched ID and blocks the input.

Solution:
Implement a session validation check immediately upon the onResume lifecycle event. If the background duration exceeds the server’s timeout threshold, trigger a hard reset of the messaging context. Clear the guestSessionId from storage and force a fresh initialize call. This workaround bypasses the token race condition entirely. Testing confirms the server invalidates the session after sixty seconds, so a manual cleanup hook is required. The SDK v2.19 doesn’t handle this gracefully out of the box.

3

Config drift catches you out quick. The guestSessionId usually expires because the token refresh interval is misaligned in the deployment config. You’ll hit that 409 when the server drops the connection before the hook fires.

  1. Update the session_ttl variable in the Terraform module. 2. Force a state refresh to sync the gateway. The conflict clears after deploy.