chat app demo with flutter and AWS websocket API

I would like to build a mobile chat application demo using flutter and AWS (web socket API/lambda) that works as follow: - User login to the mobile app using their own username o Create a web socket o Username and associated web socket need to be stored in data - From the backend, we send message to username by python script or command line o Message should go to only one user screen. - If the user logout, its connection will be removed from the database The script can only send messages to users who have active socket connection (in other words, if the connection is found in the table)