@Override protected void channelRead0(ChannelHandlerContext ctx, MqttConnectMessage message) { String username = message.payload().userName().trim().toLowerCase(); String token = new String(message.payload().passwordInBytes(), CharsetUtil.UTF_8); TokenValue tokenValue = holder.tokenManager.getTokenValueByToken(token); if (tokenValue == null || !tokenValue.user.email.equalsIgnoreCase(username)) { log.debug("MqttHardwareLogic token is invalid. Token '{}', '{}'", token, ctx.channel().remoteAddress()); ctx.writeAndFlush(createConnAckMessage(CONNECTION_REFUSED_BAD_USER_NAME_OR_PASSWORD), ctx.voidPromise()); return; } User user = tokenValue.user; Device device = tokenValue.device; DashBoard dash = tokenValue.dash; ChannelPipeline pipeline = ctx.pipeline(); HardwareStateHolder hardwareStateHolder = new HardwareStateHolder(user, tokenValue.dash, device); pipeline.replace(this, "HHArdwareMqttHandler", new MqttHardwareHandler(holder, hardwareStateHolder)); Session session = holder.sessionDao.getOrCreateSessionByUser( hardwareStateHolder.userKey, ctx.channel().eventLoop()); if (session.isSameEventLoop(ctx)) { completeLogin(ctx.channel(), session, user, dash, device, -1); } else { log.debug("Re registering hard channel. {}", ctx.channel()); ReregisterChannelUtil.reRegisterChannel(ctx, session, channelFuture -> completeLogin(channelFuture.channel(), session, user, dash, device, -1)); } }