multiple retries for fetching token

neofarm/lib.py

@@ -10,15 +10,22 @@ api_root = root_url + 'api/'
 token_url =  root_url + 'oauth/token/'
 client_id = 'neofarm'
 client_secret = 'Wk&%g#d8lYFUDrU7k7k%5ZS$V@hHauBq'
+fetch_retries = 10;
 
 def init_api():
 	client = BackendApplicationClient(client_id=client_id)
 	oauth_session = OAuth2Session(client=client)
+	for i in range(fetch_retries):
+		try:
 			token = oauth_session.fetch_token(
 				token_url = token_url,
 				client_id = client_id,
 				client_secret = client_secret
 			)
+			break
+		except ConnectionError:
+			print("Fehler bei Verbindung mit Server (wahrscheinlich DuckDns) probiere erneut...")
+			
 	oauth = OAuth2(client_id=client_id, client=client, token=token)
 
 	api = jsonapi_requests.orm.OrmApi.config({