EMQX execute with the especific version

Hello everybody…

Please how i can do it:

I have a client with mqtt version MQTT-3.1.3-5 and when connect it… in the console for clients, i can see in the client detals the message:

Protocol MQIsdp 3

And if for this razon that i can’t use ok emqx with this client.

The question is how i can configuration emqx for work whit the version 3.1.3-5 version…?

Thansk in advance.