【修改内容】mqtt的clientid使用kk_mac地址组合，保证唯一性

application/kcloud/kcloud_config.h

@@ -3,7 +3,7 @@
 #define MQTT_CONF_H_
 
 #define ADDRESS     "tcp://172.25.240.31:1983"
-#define CLIENTID    "1234"
+#define CLIENTID    "kk_%s"
 #define TOPIC       "/sys/a1OYuSBt23u/aIqEbWno8yDdsjCX15iq/thing/service/property/set"
 
 #define PAYLOAD     "Hello cwc World!"

application/kcloud/mqtt_api.c

@@ -193,7 +193,11 @@ MQTTAsync KK_MQTT_Connect(void)
 	MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;
 	MQTTAsync_setTraceCallback(mqttTraceCallback);
 	opts.MQTTVersion = MQTTVERSION_3_1_1;
-	if ((rc = MQTTAsync_createWithOptions(&s_Client, ADDRESS, CLIENTID, MQTTCLIENT_PERSISTENCE_NONE, NULL,&opts)) != MQTTASYNC_SUCCESS)
+	char mac[16]={0};
+	char clientBuf[20] = {0};
+	HAL_Get_mac(mac);
+	sprintf(clientBuf, CLIENTID, mac);
+	if ((rc = MQTTAsync_createWithOptions(&s_Client, ADDRESS, clientBuf, MQTTCLIENT_PERSISTENCE_NONE, NULL,&opts)) != MQTTASYNC_SUCCESS)
 	{
 		ERROR_PRINT("Failed to create client object, return code %d\n", rc);
 		return NULL;