import requests
from datetime import datetime
sent = datetime.now().microsecond
r = requests.post("http://localhost:3000/data", data={'avg_temp': 22, 'time': sent})
if r.status_code == 200:
    received = datetime.now().microsecond
    print("Delay is", (received - sent)/1000, "milliseconds")

print(r.status_code, r.reason)
r.close()