/// <summary>
/// 方法说明：SDK发送终端消息接口：心跳消息、请求离线消息
/// 完成时间：2017-05-16
/// </summary>
/// <param name="entity">发送消息实体</param>
/// <param name="errorMsg">提示信息</param>
/// <returns>是否成功发送消息</returns>
public bool SdkPublishTerminalMsg <T>(T entity, ref string errorMsg) where T : SdkMsTerminalBase
{
var isheartBeat = false;
var jsonStr = MsgConverter.GetJsonByTerminalMsg <T>(entity, ref isheartBeat, ref errorMsg);
return(!string.IsNullOrEmpty(jsonStr) &&
Publish(TopicSend.sdk_user.ToString(), jsonStr, isheartBeat, ref errorMsg));
}