RTU_Center_V1.10 	2013/11/05
  (1) support RTU device up to 1024
  (2) improve performance

RTU_Center_V1.11 	2014/02/14
  (1) fix the problem when load config file

RTU_Center_V1.12 	2014/03/20
  (1) add RTU API version information in "About Form"

RTU_Center_V1.14	2015/03/09
  (1) fix: RTU Center sometimes does not listen new socket connection.
  (2) fix: do not reject time-error RTU Client, and send time adjusting packet.

RTU_Center_V1.15	2015/05/13
  (1) fix: log file will miss some data when GT-540-3GWA upload log file.

RTU_Center_V1.16	2015/10/08
  (1) improve: remove device type field for easy using.

RTU_Center_V1.20	2015/10/22
  (1) support: store to database(SQL Server & My SQL).

RTU_Center_V1.21	2016/12/13
  (1) support: database overwrite

RTU_Center_V1.22	2018/11/29
  (1) fix: store to DB table "station_last_record" for MS SQL

RTU_Center_V1.30	2019/07/01
  (1) improve: client connection
  (2) revision: RTU devices can be managed in one RTU Center software for Free version, 256 to 10 devices.