#   Copyright 2018 WolkAbout Technology s.r.o.
#
#   Licensed under the Apache License, Version 2.0 (the "License");
#   you may not use this file except in compliance with the License.
#   You may obtain a copy of the License at
#
#       http://www.apache.org/licenses/LICENSE-2.0
#
#   Unless required by applicable law or agreed to in writing, software
#   distributed under the License is distributed on an "AS IS" BASIS,
#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#   See the License for the specific language governing permissions and
#   limitations under the License.

from abc import ABC, abstractmethod

"""
KeepAliveService Module.
"""


class KeepAliveService(ABC):
    """
    Publish messages to the platform in regular intervals.

    Keep device connected in cases where no data was sent over 30 minutes.
    """

    @abstractmethod
    def handle_pong():
        """Handle response from Platform."""
        pass

    @abstractmethod
    def start():
        """Publish a ping message in a repeating interval."""
        pass

    @abstractmethod
    def stop():
        """Stop the repeating interval."""
        pass
