A small script which helps you to test APNs functionality. Source: http://gobiko.com/blog/token-based-authentication-http2-example-apns/

push_notification_sender.py

import json
import jwt
import time

from hyper import HTTPConnection

ALGORITHM = 'ES256'

# fill these items
APNS_KEY_ID = ''
TEAM_ID = ''
BUNDLE_ID = ''

# put path to p8 file
APNS_AUTH_KEY = ''

# put device token id (of the notification receiver)
REGISTRATION_ID = ''

# let's do the magic :)
f = open(APNS_AUTH_KEY)
secret = f.read()

token = jwt.encode(
    {
        'iss': TEAM_ID,
        'iat': time.time()
    },
    secret,
    algorithm= ALGORITHM,
    headers={
        'alg': ALGORITHM,
        'kid': APNS_KEY_ID,
    }
)

path = '/3/device/{0}'.format(REGISTRATION_ID)

request_headers = {
    'apns-expiration': '0',
    'apns-priority': '10',
    'apns-topic': BUNDLE_ID,
    'authorization': 'bearer {0}'.format(token.decode('ascii'))
}

connection = HTTPConnection('api.development.push.apple.com:443')

# put the payload you need
payload_data = {
    'aps': {
     'content-available': '1',
     },
}
payload = json.dumps(payload_data).encode('utf-8')

connection.request(
    'POST',
    path,
    payload,
    headers=request_headers
)
resp = connection.get_response()

print(resp.status)
print(resp.read())