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+%%--------------------------------------------------------------------
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+%% Copyright (c) 2022-2023 EMQ Technologies Co., Ltd. All Rights Reserved.
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+%%
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+%% Licensed under the Apache License, Version 2.0 (the "License");
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+%% you may not use this file except in compliance with the License.
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+%% You may obtain a copy of the License at
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+%%
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+%% http://www.apache.org/licenses/LICENSE-2.0
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+%%
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+%% Unless required by applicable law or agreed to in writing, software
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+%% distributed under the License is distributed on an "AS IS" BASIS,
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+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+%% See the License for the specific language governing permissions and
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+%% limitations under the License.
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+%%--------------------------------------------------------------------
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+-ifndef(EMQX_MESSAGE_HRL).
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+-define(EMQX_MESSAGE_HRL, true).
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+
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+%% See 'Application Message' in MQTT Version 5.0
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+-record(message, {
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+ %% Global unique message ID
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+ id :: binary(),
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+ %% Message QoS
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+ qos = 0,
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+ %% Message from
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+ from :: atom() | binary(),
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+ %% Message flags
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+ flags = #{} :: emqx_types:flags(),
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+ %% Message headers. May contain any metadata. e.g. the
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+ %% protocol version number, username, peerhost or
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+ %% the PUBLISH properties (MQTT 5.0).
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+ headers = #{} :: emqx_types:headers(),
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+ %% Topic that the message is published to
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+ topic :: emqx_types:topic(),
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+ %% Message Payload
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+ payload :: emqx_types:payload(),
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+ %% Timestamp (Unit: millisecond)
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+ timestamp :: integer(),
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+ %% not used so far, for future extension
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+ extra = [] :: term()
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+}).
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+
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+-endif.
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