ESP8266 support

[techniciansoft]

Hi!
Thank you for your library!
Your library is perfect for my project, just what I need. The only problem - I can't compile example for ESP8266 Board.
Could you help me to adopt this library for ESP8266, please?

[tobozo]

hi, thanks for your feedback 👍

WiFiManagerTz takes advantage of the snmp layer and posix timezones native support from esp-idf and is limited to esp32, and adapting to esp8266 will require more than just replacing the snmp_* function calls.

Problems to solve:

1. the function handleRoute() builds the HTML page without checking for available heap, esp8266 will be OOM
2. esp8266 sdk doesn't have builtin support for sntp_set_time_sync_notification_cb() and sntp_set_sync_interval()

Possible solutions:

1. => use buffered response in handleRoute(), or send as chunks
2. => use an external NTP library

Ideally handleRoute() should drop getTemplate() calls and let you maintain your own layout elements in PROGMEM or SPIFFS, so that you can stream the content of the <select> menus without even using the heap.

[techniciansoft]

Thank you very much for the clarification!
Аctually have to solve the first problem.
The second problem in my projects is already solved as you said, with the help of external libraries
https://forum.arduino.cc/t/esp8266-ntp-tz-dst-example-simplified/632223

linestatic esp8266::polledTimeout::periodicMs showTimeNow(20000); set the polling interval and settimeofday_cb(time_is_set_scheduled); for call back function...

[tobozo]

interesting, for some reasom I though <PolledTimeout.h> was an external library.

there's a third problem: persistence, currently it's using Preferences.h with esp32, and should use EEPROM.h with esp8266, this means more changes in prefs.hpp/cpp