优化设备状态保持，自动记录心跳间隔，三次心跳失败则设备离线，不在使用设备有效期字段作为唯一判断标准，提高容错能力和稳定性。

648540858

2023-01-04 a82b831b8b2b96dfa5791808f1207500e16697cf

 src/main/java/com/genersoft/iot/vmp/storager/dao/DeviceMapper.java

@@ -61,6 +61,7 @@
                "expires," +
                "registerTime," +
                "keepaliveTime," +
                "keepaliveIntervalTime," +
                "createTime," +
                "updateTime," +
                "charset," +
@@ -88,6 +89,7 @@
                "#{expires}," +
                "#{registerTime}," +
                "#{keepaliveTime}," +
                "#{keepaliveIntervalTime}," +
                "#{createTime}," +
                "#{updateTime}," +
                "#{charset}," +
@@ -111,11 +113,13 @@
                "<if test=\"firmware != null\">, firmware='${firmware}'</if>" +
                "<if test=\"transport != null\">, transport='${transport}'</if>" +
                "<if test=\"ip != null\">, ip='${ip}'</if>" +
                "<if test=\"localIp != null\">, localIp='${localIp}'</if>" +
                "<if test=\"port != null\">, port=${port}</if>" +
                "<if test=\"hostAddress != null\">, hostAddress='${hostAddress}'</if>" +
                "<if test=\"online != null\">, online=${online}</if>" +
                "<if test=\"registerTime != null\">, registerTime='${registerTime}'</if>" +
                "<if test=\"keepaliveTime != null\">, keepaliveTime='${keepaliveTime}'</if>" +
                "<if test=\"keepaliveIntervalTime != null\">, keepaliveIntervalTime='${keepaliveIntervalTime}'</if>" +
                "<if test=\"expires != null\">, expires=${expires}</if>" +
                "WHERE deviceId='${deviceId}'"+
            " </script>"})