FreePBX XMPP server listening port for ipv6 how to focus on ipv4?

Here I'm not strong in node.js from the word at all, especially when it comes to components that still need to get through a pile of dependencies of this node.

The server is raised from FreePBX Distro 14, it has in addition to the XMPP module. While digging in Google, found out that this module is a module lets-chat https://github.com/sdelements/lets-chat/ which is pretty poorly documented, it runs on top of the module node-xmpp-server to receive only port, and domain name, that is, I can't see (without digging into the guts of nodes) how to make lets-chat to create a ipv4 socket? Enough just disable ipv6 in the settings centos7 everywhere, or not? (I would not like to do in General, but for now, ipv6 on this server, still don't need)