PI in Python

Hi,
I try to get the states at a specific epoch and I get some unexplained failing queries (I connect with my username/passwork)

This works:
states = api.get_states(time_secs = datetime.now(), bbox=(50.55, 51.2, 3.4, 5.2))

These fail: (states returns None)
states = api.get_states(time_secs = 1564298732, bbox=(50.55, 51.2, 3.4, 5.2))
states = api.get_states(time_secs = datetime(2019,7,27,23,3,28), bbox=(50.55, 51.2, 3.4, 5.2))

Any idea what I am doing wrong?
Do you need the exact time_secs to get results?
It it possible to query a time window?
Thanks,
Luc

In find this in the documentation of the API at opensky-network.org/apidoc/
"OpenSky users can retrieve data of up to 1 hour in the past. If the time parameter has a value t<now−3600 the API will return 400 Bad Request."
Your timestamp looks much older.

That answers my question on the query but leaves without option to reach my goal.
I am trying to link noise events in (logged) noise measurements to aircraft positions. It there a way to get access to that kind of historical data for scientific purposes?
Luc

You could apply for historical data access and use the traffic library if you got access:
github.com/xoolive/traffic

I use my credentials and the script runs without error. Is it possible that the API doesn't indicate that the credentials didn't work and you end up (without information) with an API instance with limited access?
Since I need a lot of data it is easier to submit a full request for data (submitted a few minutes ago...). that's more efficient then performing the queries myself.
THanks,
Luc