public static byte[] updateBuddyChannel(int characterid, int channel) {
            MaplePacketLittleEndianWriter mplew = new MaplePacketLittleEndianWriter();

            mplew.writeShort(SendPacketOpcode.BUDDYLIST.getValue());
            mplew.write(20);
            mplew.writeInt(characterid);
            mplew.write(0);
            mplew.writeInt(channel);

            return mplew.getPacket();
        }