How to retrieve delayed stock price by python via IB TWS

Question

This is the code attempting to retrieve AAPL delayed stock price via Interactive Broker (IB) TWS.

However, none of data is retrieved.

As you can see, app.reqMarketDataType(3) has been called to set delayed data. (3 is delay)

I've logged into demo account in IB TWS and ensured "Enable ActiveX and Socket client" is selected.

from ibapi.client import EClient
from ibapi.wrapper import EWrapper
from ibapi.contract import Contract

import threading
import time
   
class IBapi(EWrapper, EClient):
    def __init__(self):
        EClient.__init__(self, self)
    def tickPrice(self, reqId, tickType, price, attrib):
        if tickType == 2 and reqId == 1:
            print('The current ask price is: ', price)

def run_loop():
    app.run()

app = IBapi()
app.connect('127.0.0.1', 7497, 123)

#Start the socket in a thread
api_thread = threading.Thread(target=run_loop, daemon=True)
api_thread.start()

time.sleep(1) #Sleep interval to allow time for connection to server

#Create contract object
apple_contract = Contract()
apple_contract.symbol = 'AAPL'
apple_contract.secType = 'STK'
apple_contract.exchange = 'SMART'
apple_contract.currency = 'USD'

#Request Market Data
app.reqMarketDataType(3)
app.reqMktData(1, apple_contract, '', False, False, [])

time.sleep(10) #Sleep interval to allow time for incoming price data
app.disconnect()

Answer 1

The code works ok. The problem is you don't print unless you get tickType 2(real time ask), delayed ask is tickType 67.

https://interactivebrokers.github.io/tws-api/tick_types.html