Code in JS is:
const usr = process.env.USERNAME;
const pwd = process.env.PASSWORD;
var mc = require('minecraft-protocol');
var autoVersionForge = require('minecraft-protocol-forge').autoVersionForge;
var client = mc.createClient({
version: '1.15.2',
host: 'myserver.ip',
port: 37390,
username: usr,
password: pwd
});
autoVersionForge(client);
The server is forge 1.15.2
Disconnecting VANILLA connection attempt... was in console of server