How to handle message from Query().

[กชนัฐ วิสกี้]

I'm very new to Serf.
I want to broadcast message like I did in memberlist but I don't know I should use whether UserEvent or Query.

Now, I'm trying Query(). and set the limit to 1400 bytes (since I always use in localhost, I guess it's okay?)
The next problem is

1. when I use Query() to broadcast message, It sends broadcast message to other nodes too many time and sends to origin node too, which I don't want it to

2. I don't know how to handle incoming messages, since I cannot overwrite NotifyMsg() like in memberlist.

this is my configuraiton: https://pastebin.com/m41RPF2A

Any other good suggestions such like basic configuration, example usage, ... are welcome too!
Thanks!

fe1t