Hello @Bhanu Also the token code for Nifty and Bank Nifty has changed in the scrip master. Please use the new values. Please try using this code during market hours from SmartApi.smartWebSocketV2 import SmartWebSocketV2 from logzero import logger AUTH_TOKEN = "auth_token" API_KEY = "api_key_here" CLIENT_CODE = "client_code" FEED_TOKEN = "feed_token" correlation_id = "abc123"// any string value action = 1 mode = 3 token_list = [ { "exchangeType": 1, "tokens": ["26009"] } ] #retry_strategy=0 for simple retry mechanism sws = SmartWebSocketV2(AUTH_TOKEN, API_KEY, CLIENT_CODE, FEED_TOKEN) #retry_strategy=1 for exponential retry mechanism # sws = SmartWebSocketV2(AUTH_TOKEN, API_KEY, CLIENT_CODE, FEED_TOKEN,max_retry_attempt=3, retry_strategy=1, retry_delay=10,retry_multiplier=2, retry_duration=30) def on_data(wsapp, message): logger.info("Ticks: {}".format(message)) # close_connection() def on_control_message(wsapp, message): logger.info(f"Control Message: {message}") def on_open(wsapp): logger.info("on open") some_error_condition = False if some_error_condition: error_message = "Simulated error" if hasattr(wsapp, 'on_error'): wsapp.on_error("Custom Error Type", error_message) else: sws.subscribe(correlation_id, mode, token_list) # sws.unsubscribe(correlation_id, mode, token_list1) def on_error(wsapp, error): logger.error(error) def on_close(wsapp): logger.info("Close") def close_connection(): sws.close_connection() # Assign the callbacks. sws.on_open = on_open sws.on_data = on_data sws.on_error = on_error sws.on_close = on_close sws.on_control_message = on_control_message sws.connect()