https://github.com/xoseperez/espurna/issues/1839#issuecomment-518248474

* Telnet rewrite, no longer using ESPAsyncTCP

* Support two telnet server implementations

* Clean up diff

* Update types, no free() calls, cleanup

* Use std::unique_ptr

* Fix nullptr checks

* Fix double log with async server

* Common new connection method

* use same connected() check as sync variant

* fixup! use same connected() check as sync variant

* Fix compile issue, close connection in case of timeout and when max connections reached

* Use AyncsClient* in function call

* Allow overriding telnet port + max clients

* Do not allocate 512 bytes by default

* Use TERMINAL_BUFFER_SIZE

* Make compilation more flexible allowing to define in custom.h your own variation to devices and define four wifi networks

* Implement suggestion from Max Prokhorov, it's simpler and cleaner

* Change a #elif by #else

* Move ESPurna Core comment

* Update encoder

- import modified Encoder library
- customize minimum delta value

* minimum delta in header config

* fixup! minimum delta in header config

* fix dead code, actually use interrupts

* move static class methods to normal funcs, apply namespace

* drop hardcoded register use

- use peripheral api (see cores/esp8266/esp8266_peri.h)
- remove bitmask and register struct members

* add a note about changes

* fixup! add a note about changes

Allow defining custom device name for alexa integration, other than hostname.
Still uses hostname as a fallback.

- store system crash counter and reset reason in rtcmem instead of eeprom
- store relay state mask in rtc in addition to the eeprom
- store relay state in eeprom only when boot mode requires it
- simplify relay state mask calculation / reading using std::bitset
- light state save and restore
- energy total save and restore

- remove optional RFRAW_SUPPORT
- enable module when RF_SUPPORT=1, optionally enable RCSwitch
- reorder ifdef checks to treat RFB_DIRECT and old RF_SUPPORT the same
- rename RF_PIN to RFB_RX_PIN
- depend on RF_SUPPORT instead of ITEAD_SONOFF_RFBRIDGE
- runtime TX & RX PIN setting

* Call delay() after callbacks
* Use safer loop delay value

1. Add thermostat to the espurna_modules in progmem.h
2. Add thermostat to webui, gulp, html, js.
3. in general.h MQTT_USE_JSON returned to 0 by default and 1 if thermostat enabled.

- Heartbeat mode and interval configuration added to WebUI ADMIN page
- New option HEARTBEAT_REPEAT_STATUS: on device startup full heartbeat information and after HEARTBEAT_INTERVAL only STATUS report.
- Enhanced first heartbeat message - on device startup it will send heartbeat after ntpSynced will be true to get device time.

P.S. Code is tested. Web part is not compiled, and not tested. I hope it will work :)

* Merge RF and RFBridge code

* Keep rfbridge.ino filename

* Corrected #if checks

* Make RF_DEBOUNCE and RF_LEARN_TIMEOUT configurable

* Fix compile warnings with platform_latest

* Telnet auth depends on setting

* use same define suffix as WS_

* add to web

* no initial passwd for core

* allow override of WEB_REMOTE_DOMAIN

* allow override of HOMEASSISTANT_ENABLED and _PREFIX

fix 30285b3

* fix webui regexp and input length limits
* explain requirements in webui and headers

Add button definitions to the travis02 and travis03
IR_BUTTON should be uint32_t to properly work with new macro
eepromRotate return value is not used