Button release notes from FW 2.30 to FW 2.52:
- Feature - Support for basic authentication
- Change - Increased number of characters for url from 127 to 383 chars 


Button release notes from FW 2.05 to FW 2.30:

- RAM optimalization,
- send payload to port +1000,
- remove service mode,
- reduction time of work,
- extend self AP mode to 5 minutes,
- proper activation of LED (battery insertion, reboot, factory, user action, timer wakeup),
- wakeup at 12h,
- proper detect wakeup action user or timer,
- limit connect to AP if not found,
- limit wait for DHCP server,
- use SNTP before establish SSL connecction,
- control LED and sleep by UART (for factory purpose),
- factory reset possible also from AP mode,
- remove memory leak,
- possiblilty to read local callback URLs,
- fix problem with connect to network with bad password,
- better processing of payload response (no Content-Lenght),
- WPS equal 2 minutes,
- ATI procedure for automatic touch sensor callibration,
- more robust I2C communication in special cases,
- additional SRS operations,
- fix problem with erase key and counter,
- charge connect cause no sleep,
- don't erase key and counter after FW upgrade,
- no enable led after FW upgrade,
- new reset method,
- fix potential problem with FW upgrade,
- fix blink if wrong response from server,
- more save close srs connection if connect but not connected yest,
- fix problem if AP no found,
- change white LED behavior,
- new bootloader for faster read button status,
- wheel support,
- increase single press time,
- better sensivity,
- reload touch sensor confituration after FW upgrade,
- removed 2 unnecessary 3rd party libraries (simplified OSS statement and reduced FW size),
- more reliable connection to the server (under certain conditions the button would not connect to the server to get data necessary to send to the server notifications about events),
- init srs ticks by timestamp,
- faster connect to notify server by cahed IP,
- HTTP referer filtering in API,
- send devType fwVersion in srs init for faster device detect.