Quick reply, as I am away from my keyboard.

MQTT messages are ACL checked by topic. You can check mod_mqtt for an example 
observer.

If you just want to publish from Erlang, then you can use z_acl:sudo/1 on the 
Context. This switches off ACL checks.

- Marc

Sent from my iPhone

> On 26 Nov 2016, at 03:49, heiheshang <[email protected]> wrote:
> 
> how to set the right user to send messages to z_mqtt.
> I found that the average user of this site can not send messages
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