var ByteArrayOutputStream = Java.type("java.io.ByteArrayOutputStream")
var DataOutputStream = Java.type("java.io.DataOutputStream")
var PacketBuffer = Java.type("net.minecraft.network.PacketBuffer")
var Unpooled = Java.type("io.netty.buffer.Unpooled")
var C17PacketCustomPayload = Java.type("net.minecraft.network.play.client.C17PacketCustomPayload")
var IOException = Java.type("java.io.IOException")
var C03PacketPlayer = Java.type("net.minecraft.network.play.client.C03PacketPlayer")
//and for the module, just paste what auto reply bot said, 
        if(packet instanceof C03PacketPlayer) {
            if(mc.thePlayer.ticksExisted % 15 == 0) { 
              try {
                  b = new ByteArrayOutputStream();
                  out = new DataOutputStream(b);
                  out.writeUTF(mc.thePlayer.getGameProfile().getName());
                  buf = new PacketBuffer(Unpooled.buffer());
                  buf.writeBytes(b.toByteArray());
                  mc.thePlayer.sendQueue.addToSendQueueNoEvent(new C17PacketCustomPayload("matrix:geyser", buf));
                } catch (IOException) {

                }
            }
        }

you can google it easily

it's like:

var [varname] = Java.type("thing you wanna import -> lang object")

look after the lang object.

i googled 1 of em and instantly found them.

same with PacketBuffer, and the rest that is comming from minecraft

        if(packet instanceof C03PacketPlayer) {
            if(mc.thePlayer.ticksExisted % 15 == 0) { 
              try {
                  b = new ByteArrayOutputStream();
                  out = new DataOutputStream(b);
                  out.writeUTF(mc.thePlayer.getGameProfile().getName());
                  buf = new PacketBuffer(Unpooled.buffer());
                  buf.writeBytes(b.toByteArray());
                  mc.thePlayer.sendQueue.addToSendQueueNoEvent(new C17PacketCustomPayload("matrix:geyser", buf));
                } catch (IOException) {

                }
            }
        }