From 87387a8a83ea6f60a6527c3ee87b3f116d5a4873 Mon Sep 17 00:00:00 2001
From: Akash Santra <santraakash999@gmail.com>
Date: Mon, 2 Mar 2026 17:58:32 +0530
Subject: [PATCH] Fix mobile socket connection by enabling polling fallback p2

---
 backend/src/lib/socket.js          |  5 +++++
 frontend/src/store/useAuthStore.js | 18 +++++++++++++++++-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/backend/src/lib/socket.js b/backend/src/lib/socket.js
index 76d3335..36943f0 100644
--- a/backend/src/lib/socket.js
+++ b/backend/src/lib/socket.js
@@ -8,11 +8,16 @@ import User from "../models/user.model.js";
 const app = express();
 const server = http.createServer(app);
 
+server.keepAliveTimeout = 120000;
+server.headersTimeout = 120000;
+
 const io = new Server(server, {
   cors: {
     origin: ["https://chat-app-sooty-mu.vercel.app", "http://localhost:5173"],
     credentials: true,
   },
+  pingTimeout: 60000,
+  pingInterval: 25000,
 });
 
 const userSocketMap = {};
diff --git a/frontend/src/store/useAuthStore.js b/frontend/src/store/useAuthStore.js
index 5627b46..6e185ee 100644
--- a/frontend/src/store/useAuthStore.js
+++ b/frontend/src/store/useAuthStore.js
@@ -175,10 +175,26 @@ export const useAuthStore = create((set, get) => ({
     //   reconnection: true,
     // });
 
+    // const newSocket = io(BASE_URL, {
+    //   auth: { userId: authUser._id },
+    //   withCredentials: true,
+    //   reconnection: true,
+    // });
+
     const newSocket = io(BASE_URL, {
       auth: { userId: authUser._id },
-      withCredentials: true,
+
+      // Let socket decide best transport (polling → websocket upgrade)
+      transports: ["polling", "websocket"],
+
+      // Stability settings
       reconnection: true,
+      reconnectionAttempts: Infinity,
+      reconnectionDelay: 1000,
+      reconnectionDelayMax: 5000,
+
+      // Important for slower mobile TLS handshakes
+      timeout: 20000,
     });
 
     //Attach ALL listeners BEFORE doing anything else