from tfw import EventHandlerBase

class MyFirstEventHandler(EventHandlerBase):
    def __init__(self):
        super().__init__(self, key='fsm_update')

    def handle_event(self, message):
        print('I have received a message! Yaaay!')

        # the return value of this method is automatically
        # sent back to the TFW server
        return {
            'key': 'message',
            'data': {
                'originator': 'My first event handler',
                'message': f'I have received this message: {message}'
            }
        }