emqx4.3/rel/files/plugins.config

[
% {emysql, [
%    {pool_size, 4},
%    {host, "localhost"},
%    {port, 3306},
%    {username, "root"}, 
%    {password, "public"},
%    {database, "mqtt"},
%    {encoding, utf8}
% ]},
% {emqttd_auth_mysql, [
%     {user_table, mqtt_users},
%     {password_hash, plain},
%     {field_mapper, [
%         {username, username},
%         {password, password}
%     ]}
% ]},
% {emqttd_dashboard, [
%    {listener, 
%        {http, 18083, [
%            {acceptors, 4},
%            {max_clients, 512}]}}
% ]}
%
].