✨ mqtt 3.1 协议会校验 clientId 长度，添加设置。

mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/server/MqttServerAioHandler.java

@@ -40,7 +40,7 @@ public class MqttServerAioHandler implements ServerAioHandler {
 	private final MqttServerProcessor processor;
 
 	public MqttServerAioHandler(MqttServerCreator serverCreator, MqttServerProcessor processor) {
-		this.mqttDecoder = new MqttDecoder(serverCreator.getMaxBytesInMessage());
+		this.mqttDecoder = new MqttDecoder(serverCreator.getMaxBytesInMessage(), serverCreator.getMaxClientIdLength());
 		this.mqttEncoder = MqttEncoder.INSTANCE;
 		this.allocator = serverCreator.getBufferAllocator();
 		this.processor = processor;

mica-mqtt-core/src/main/java/net/dreamlu/iot/mqtt/core/server/MqttServerCreator.java

@@ -114,6 +114,10 @@ public class MqttServerCreator {
 	 * debug
 	 */
 	private boolean debug = false;
+	/**
+	 * mqtt 3.1 会校验此参数
+	 */
+	private int maxClientIdLength = MqttConstant.DEFAULT_MAX_CLIENT_ID_LENGTH;
 
 	public String getName() {
 		return name;
@@ -275,6 +279,15 @@ public class MqttServerCreator {
 		return this;
 	}
 
+	public int getMaxClientIdLength() {
+		return maxClientIdLength;
+	}
+
+	public MqttServerCreator maxClientIdLength(int maxClientIdLength) {
+		this.maxClientIdLength = maxClientIdLength;
+		return this;
+	}
+
 	public MqttServer start() {
 		Objects.requireNonNull(this.messageListener, "Mqtt Server message listener cannot be null.");
 		if (this.authHandler == null) {

mica-mqtt-example/src/main/java/net/dreamlu/iot/mqtt/server/MqttServerTest.java

@@ -42,6 +42,10 @@ public class MqttServerTest {
 			.port(1883)
 			// 默认为： 8092（mqtt 默认最大消息大小），为了降低内存可以减小小此参数，如果消息过大 t-io 会尝试解析多次（建议根据实际业务情况而定）
 			.readBufferSize(512)
+//			最大包体长度
+//			.maxBytesInMessage(1024 * 100)
+//			mqtt 3.1 协议会校验 clientId 长度。
+//			.maxClientIdLength(64)
 			.messageListener((clientId, topic, mqttQoS, payload) -> {
 				logger.info("clientId:{} topic:{} mqttQoS:{} message:{}", clientId, topic, mqttQoS, ByteBufferUtil.toString(payload));
 			})