%% Qipai EMQX ACL for the selected Jilian device protocol.
%% EMQX ACL files use Erlang tuple rules and are matched from top to bottom.
%% Device MQTT username must equal its DeviceID. Credentials are created outside Git.

%% A device may publish only its uplink and will topics.
{allow, {clientid, {re, "^qipai-device-[A-Za-z0-9_-]+$"}}, publish, [
  "/devicesend/${username}",
  "/devicewill/${username}"
]}.

%% A device may subscribe only to its command topic.
{allow, {clientid, {re, "^qipai-device-[A-Za-z0-9_-]+$"}}, subscribe, [
  "/deviceaccept/${username}"
]}.

%% Backend service subscribes to uplink/will and publishes commands.
{allow, {username, "qipai_backend_prod"}, subscribe, [
  "/devicesend/+",
  "/devicewill/+"
]}.
{allow, {username, "qipai_backend_prod"}, publish, [
  "/deviceaccept/+"
]}.

%% Do not expose system topics or broad wildcards to ordinary clients.
{deny, all, subscribe, ["$SYS/#", {eq, "#"}, {eq, "+/#"}]}.

%% Production default: deny anything not explicitly allowed above.
{deny, all}.