[Python] ibapi (Python) - get data from the option Chain

I am starting to work with Python & the IBKR API and have a problem with receiving data from the option chain:

Within the option chain I am trying to find a strike based an a specific delta (or close to it). So, let's say I want to find the strike price where delta ~ 0.20. Additionally, I want to return the mid price of this strike (this is a future step, still struggling with the delta)

This is how I tried it so far, however I do not receive data back (process finished with exit code 0).

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


class TestApp(EWrapper, EClient):
def __init__(self):
EClient.__init__(self, self)
self.nextOrderId = 0
self.permId2ord = {}
self.strike = 160

def error(self, reqId, errorCode, errorString):
print(f"Error: {reqId} {errorCode} {errorString}")

def nextValidId(self, orderId: int):
self.req_data(orderId)

def req_data(self, orderId):
optcontract = Contract()
optcontract.symbol = "AAPL"
optcontract.secType = "OPT"
optcontract.exchange = "SMART"
optcontract.currency = "USD"
optcontract.lastTradeDateOrContractMonth = "20240419"
optcontract.strike = self.strike
optcontract.right = "P"

self.reqMarketDataType(4)
self.reqMktData(orderId, optcontract, '106', False, False, [])

def tickOptionComputation(self, reqId: int, tickType: int, impliedVol,
delta, optPrice, pvDividend,
gamma, vega, theta, undPrice):
print(f"Delta: {delta} for option with reqId {reqId}")
if delta > 0.22:
self.strike -= 5
self.req_data(reqId + 1)
elif delta < 0.18:
self.strike += 5
self.req_data(reqId + 1)
else:
print(f"Found an option with Delta in the desired range. Strike: {self.strike} Delta: {delta}")
self.cancelMktData(reqId)


def main():
app = TestApp()
app.connect('127.0.0.1', 7497, 0)
app.nextOrderId = 0
# Call an initial request for OrderId increments
app.reqIds(-1)
# Initialize the run loop
api_thread = threading.Thread(target=lambda: app.run(), daemon=True)
api_thread.start()

time.sleep(10)
app.disconnect()


if __name__ == "__main__":
main()

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