This library is for common tasks of a user interface for IoT devices, mainly beneficial on ESP8266/ESP32. It supports a status LED, storing log (depending on buffer size) and integrates basic functions like WiFi (re-)connect, OTA and optional NTP integration.

Tested with Espressif's ESP32 and ESP8266 using Arduino framework to compile.

• include universalUIglobal.h and use instance variable ui where you need it
• see example usage in webUiGenericPlaceHolder.h

Uses NTP time if available, if not fall back to timestamps using millis().

• dependency in platformio.ini: libs = NTPClient
• create instance in your main sketch NTPClient *timeClient = new NTPClient(ntpUDP, "europe.pool.ntp.org", 3600, 60000);
• inject instance into universalUi in method setup(): ui.setNtpClient(timeClient);

• include webUiGenericPlaceHolder.h
• see example usage in projects calibrationServer and espEnviServer

• add universalUI as lib into your project. There are several options:

  • reference as library dependency from github:

    lib_deps = https://github.com/makerMcl/universalUi.git

  • reference as separate directory, i.e. reuse among several projects:

    lib_extra_dirs = ../zCommon-libs

  • add as git-submodule in /lib from https://github.com/makerMcl/universalUi.git (you should have found this file there)

• same goes for blinkLed.h as dependency, from https://github.com/makerMcl/blinkled.git
• provide Streaming as dependency
  • Note: I use Streaming v6 for _WIDTH-feature: in platformio lib registry is still version 5
  • Workaround: add lib from the current maintainer as git-submodule in lib/ directory
  • after v6 has been uploaded to platformio lib registry, in platformio.ini via libs = Streaming should suffice
• copy universalUIsettings.h_sample into universalUIsettings.h and provide WLAN and OTA settings

• converted universalUi to header-only lib to avoid issue with different effective settings in archived compile artifacts of it (got an overflow/reboot bug due to that effect)
• universalUi is used as static instance on heap, to allow use via external reference in sub-libs of project
• SPIFFS is deprecated now, but necessary used by AsyncWebServer - thus the temporary deprecation disabling in method serverSetup()
• I prefer default baudrate of bootloader, thus using 74800 for Serial on ESP8266
• I prefer HTML template content (index.html, log.html) on SPIFFS not only to save flash but first because you can read that code more easily, including the template variables

Licenced under GPL v3

For contact, create a github issue please.

• get unit tests running (see feature-file for more test specifications)