2023-11-14[2.3B]    1. Bug fix for TCP connection delay under specific conditions.

2023-01-17[2.3A]    1. Supports Multiple Connection (Max. 8 channels)
                    2. Support AT+PLS Command on ATC mode
                    3. Improves RFC2217 function
                    4. Fixes some minor bugs

2018-11-30[2.1A]    1. Fixed a bug failing to link with some switching hubs
                    2. Support TLS v1.1 and TLS v1.2
                    3. Remove SSL v2.0 and SSL v3.0
                    4. Add new commands for AT command mode: AT+PSSL, ATV2
                    5. Improve GARP function
                    6. Support RFC3168
                    7. Fixed minor bugs

2016-03-18[2.0A]    1. Add default password for telnet console.
                    2. Fix bugs about handling telnet sub-option and password. 

2015-12-22[1.1B]    1. Change DNS source port(53 to a random value between 4096 ~ 65535)
                    2. Activate DTR signal in UDP mode
                    3. Support 300 and 600bps 

2014-11-28[1.1A]    1. Enable Separator Function in UDP mode
                    2. Fix DHCP bug
                    3. Improve RFC2217 function
                    4. Add User select TCP timer option

2013-11-05[1.0E]    1. Support SD command
                    2. Support RFC2217 on RS422/485
                    3. Fix minor bugs

2013-02-14[1.0D]    1. Support CSE-M53N
                    2. Support 7 data bit with parity
                    3. Remove Data Frame option
                    4. Fix minor bugs about AT command and RFC2217

2012-11-26[1.0C]    1. Add CSE-H53N
                    2. Fix a bug about RTS/CTS flow control

2012-11-09[1.0B]    1. Fix a bug about DNS in UDP mode

2012-11-02[1.0A]    1. Initial Relese