Configure M66 for CloudMQTT server instead of ALI

I am using M66 GSM module for my project. We are using cloudmqtt server for our project.
In the example code, i could see there are example to show ALI cloud only.
Is ALIAUTH is just a name for Server Configuration or it is fix one?
What are the Will Configuration?

Dear Saagemb,
Thanks for your inquiry in Quectel forum.
The ALI cloud is just an example, not fix one. You can use your own cloud mqtt server to test it. Thanks!
Will is just a type of MQTT, the Will message defines the content of the message that is published to the will topic if the client is unexpectedly disconnected. It can be a zero-length message. Thanks!