add multi-user idle check

app.py

 from flask import Flask
 from flask_socketio import SocketIO, send
 from flask_sqlalchemy import SQLAlchemy
+from flask import request
 from difflib import get_close_matches
 import time
 import threading
@@ -22,7 +23,7 @@ class QAPair(db.Model):
         return self.question
 
 waiting_time = 10
-last_msg = time.time() + 12
+last_msg = {}
 question = QAPair.query.with_entities(QAPair.question).all()
 questions = [a.question for a in question]
 
@@ -36,17 +37,23 @@ def handleMessage(msg):
         send(ans, broadcast=False)
     else:
         send("sorry, I don't understand the question", broadcast = False)
+
     global last_msg
-    last_msg = time.time()
+
+    last_msg[request.sid] = time.time()    
 
 def idle_check_thread():
     global last_msg
     global waiting_time
     while True:
         current_time = time.time()
-        if (last_msg + waiting_time) < current_time and (last_msg + waiting_time + 4) > current_time:
-            socketio.send("are you there?")
-        time.sleep(5)
+        try:
+            for e in last_msg:
+                if (last_msg[e] + waiting_time) < current_time and (last_msg[e] + waiting_time + 4) > current_time:
+                    socketio.send("are you there?",to= e )
+                    last_msg[e] = 0
+        except:
+            pass
 
 x = threading.Thread(target=idle_check_thread)
 x.start()