修复了MQTT曾经连上，但中途长时间断开，导致消息队列一直增加爆内存，进而导致死机的问题

TC1/http_server/web/index.html

@@ -1519,7 +1519,7 @@ document.getElementById("submit-ota-link").disabled = true;
     //return;
     var fileInput = document.getElementById("ota_file");
     if (fileInput.files.length === 0) {
-        alert("请选择要上传的 OTA 文件");
+        Toast("请选择要上传的 OTA 文件");
         return;
     }
 clearTimeout(powerTimerId);

TC1/http_server/web_log.c

@@ -2,6 +2,8 @@
 #include <stdlib.h>
 #include <string.h>
 #include <stdarg.h>
+#include "mico.h"
+
 
 #include"http_server/web_log.h"
 
@@ -36,6 +38,9 @@ char* GetLogRecord()
         tmp += strlen(tmp);
         if (!log_record.logs[i%LOG_NUM]) continue;
         sprintf(tmp, "%s\n", log_record.logs[i%LOG_NUM]);
+        if(i == log_record.idx){
+        sprintf(tmp, "FreeMem %d bytes\n", MicoGetMemoryInfo()->free_memory);
+        }
     }
     return log_record_str;
 }

TC1/mqtt_server/user_mqtt_client.c

@@ -443,7 +443,7 @@ void ProcessHaCmd(char *cmd) {
 OSStatus UserMqttSendTopic(char *topic, char *arg, char retained) {
     OSStatus err = kUnknownErr;
     p_mqtt_send_msg_t p_send_msg = NULL;
-    if(mqtt_msg_send_queue == NULL){
+    if(mqtt_msg_send_queue == NULL|| !isconnect){
     return err;
     }