def fcm_send_message(
        registration_id,
        title=None,
        body=None,
        icon=None,
        data=None,
        sound=None,
        badge=None,
        low_priority=False,
        condition=None,
        time_to_live=None,
        click_action=None,
        collapse_key=None,
        delay_while_idle=False,
        restricted_package_name=None,
        dry_run=False,
        color=None,
        tag=None,
        body_loc_key=None,
        body_loc_args=None,
        title_loc_key=None,
        title_loc_args=None,
        content_available=None,
        extra_kwargs={},
        api_key=None,
        json_encoder=None,
        **kwargs):

    """
    Copied from https://github.com/olucurious/PyFCM/blob/master/pyfcm/fcm.py:

    Send push notification to a single device
    Args:
        registration_id (str): FCM device registration IDs.
        body (str): Message string to display in the notification tray
        data (dict): Data message payload to send alone or with the notification
            message
        sound (str): The sound file name to play. Specify "Default" for device
            default sound.
    Keyword Args:
        collapse_key (str, optional): Identifier for a group of messages
            that can be collapsed so that only the last message gets sent
            when delivery can be resumed. Defaults to ``None``.
        delay_while_idle (bool, optional): If ``True`` indicates that the
            message should not be sent until the device becomes active.
        time_to_live (int, optional): How long (in seconds) the message
            should be kept in FCM storage if the device is offline. The
            maximum time to live supported is 4 weeks. Defaults to ``None``
            which uses the FCM default of 4 weeks.
        low_priority (boolean, optional): Whether to send notification with
            the low priority flag. Defaults to ``False``.
        restricted_package_name (str, optional): Package name of the
            application where the registration IDs must match in order to
            receive the message. Defaults to ``None``.
        dry_run (bool, optional): If ``True`` no message will be sent but
            request will be tested.

    Returns:
        :tuple:`multicast_id(long), success(int), failure(int),
            canonical_ids(int), results(list)`:
        Response from FCM server.
    Raises:
        AuthenticationError: If :attr:`api_key` is not set or provided or there
            is an error authenticating the sender.
        FCMServerError: Internal server error or timeout error on Firebase cloud
            messaging server
        InvalidDataError: Invalid data provided
        InternalPackageError: JSON parsing error, mostly from changes in the
            response of FCM, create a new github issue to resolve it.
    """
    if api_key is None:
        api_key = SETTINGS.get("FCM_SERVER_KEY")
    push_service = FCMNotification(api_key=api_key, json_encoder=json_encoder)
    result = push_service.notify_single_device(
        registration_id=registration_id,
        message_title=title,
        message_body=body,
        message_icon=icon,
        data_message=data,
        sound=sound,
        badge=badge,
        collapse_key=collapse_key,
        low_priority=low_priority,
        condition=condition,
        time_to_live=time_to_live,
        click_action=click_action,
        delay_while_idle=delay_while_idle,
        restricted_package_name=restricted_package_name,
        dry_run=dry_run,
        color=color,
        tag=tag,
        body_loc_key=body_loc_key,
        body_loc_args=body_loc_args,
        title_loc_key=title_loc_key,
        title_loc_args=title_loc_args,
        content_available=content_available,
        extra_kwargs=extra_kwargs,
        **kwargs
    )

    # do not raise errors, pyfcm will raise exceptions if response status will
    # be anything but 200

    return result
Copied from https://github.com/olucurious/PyFCM/blob/master/pyfcm/fcm.py:

    Send push notification to a single device
    Args:
        registration_id (str): FCM device registration IDs.
        body (str): Message string to display in the notification tray
        data (dict): Data message payload to send alone or with the notification
            message
        sound (str): The sound file name to play. Specify "Default" for device
            default sound.
    Keyword Args:
        collapse_key (str, optional): Identifier for a group of messages
            that can be collapsed so that only the last message gets sent
            when delivery can be resumed. Defaults to ``None``.
        delay_while_idle (bool, optional): If ``True`` indicates that the
            message should not be sent until the device becomes active.
        time_to_live (int, optional): How long (in seconds) the message
            should be kept in FCM storage if the device is offline. The
            maximum time to live supported is 4 weeks. Defaults to ``None``
            which uses the FCM default of 4 weeks.
        low_priority (boolean, optional): Whether to send notification with
            the low priority flag. Defaults to ``False``.
        restricted_package_name (str, optional): Package name of the
            application where the registration IDs must match in order to
            receive the message. Defaults to ``None``.
        dry_run (bool, optional): If ``True`` no message will be sent but
            request will be tested.

    Returns:
        :tuple:`multicast_id(long), success(int), failure(int),
            canonical_ids(int), results(list)`:
        Response from FCM server.
    Raises:
        AuthenticationError: If :attr:`api_key` is not set or provided or there
            is an error authenticating the sender.
        FCMServerError: Internal server error or timeout error on Firebase cloud
            messaging server
        InvalidDataError: Invalid data provided
        InternalPackageError: JSON parsing error, mostly from changes in the
            response of FCM, create a new github issue to resolve it.