Python: GUI App for PushBullet API

Python GUI (Desktop) App using Tkinter and PySimpleGUI integrating with PushBullet to send messages

Requirements:

Create a script
Link the pushbullet site API
It should send messages automatically
Connecting to the Pushbullet API: The script will connect to the Pushbullet API using the API key and access token.
Choosing the device: The user will be prompted to choose the device connected to their email that they want to send the messages from.
Message content: The user will be prompted to choose a file containing the message they want to send. The script will read the contents of the file and store it in a variable.
Transmission time: The user will be prompted to set the time interval between each transmission. The script will use this interval to determine when to send each message.
Automatic transmission: The script will use a loop to continuously send the messages at the specified interval until the user stops the process.