I am new at Android developing. I have work on create push notification. But not successfully yet. I have Python for send notification to Android phone (Android 9). This code is:
import urllib
import json
import sys
from pyfcm import FCMNotification
def push_to_fcm(device_token, gcm_key, title=None, message=None, data=None, sound=None, badge=None):
fcm_push_service = FCMNotification(api_key=gcm_key)
fcm_push_service.notify_single_device(
registration_id=device_token,
message_title=title,
message_body=message,
data_message=data,
sound=sound,
badge=badge
)
push_to_fcm("myPHoneID","FCMKey","test Title","messagebody")
When I run this py I got weird rectangular shape shown bottom of my phone then close itself. 
Where did I do wrong? I want to make regular push notification like "hey you got new message!" Comes from top of the secreen.
Also in simulator I got empty circle shape in bottom of screen
