Release v3.2.1

• fix crashing in UI if TS datasource is not available somehow
• adopt to asyncserver 3.x
• Bump EmbUI to v3.1.2

Rel v3.2.0

• Update readme
• implement Tiered TimeSeries data sampling
• MQTT publishing PZEM metrics data
• bump EmbUI version up to v3.1 (API change, need to update resourses)
• Add FS image data folder
• remove FTP server lib
• espem could be build with DummyPZEM emulator for prototyping
• periodic publishing sends raw integer values to webui, js does the formatting for webui
• add frequency value to the left menu

Release v3.1.0

• deprecate esp32 platform v3.5 and older
• compressed OTA updates via esp32-flashz lib
• web application manifest added, ESPEM webpage UI could be added as a shortcut on mobile chrome
• adopted building with Arduino core >2.0.0
• debug version dumps polled data readings to console
• http://espem/fw provides more details about mem/psram usage
• UI now can detect if PZEM is disconnected or unreachable and show "err" values
• energy offset feature

Full Changelog: v3.0.0...v3.1.0

ver 3.0.0

• project switched to pzem-edl lib, version 2.x becomes legacy
  • drop support for older PZEM004 model
  • drop support for esp8266
• UART configuration could be done via WebUI
• 1 level TimeSeries chart only (for now)
• bump EmbUI version up to v2.6

ver 2.0.1

• WebUI displays for Voltage, Current, Energy
• ESP32 support (hardware serial only, with pin remapping)
• PZEM-004Tv30 support

• SoftwareSerial from now on is deprecated

• heap curruption fix
• bump EmbUI version up to v2.5

Version 2.0.0

Completely reworked project.
- UI switched to EmbUI framework
- embeded dashboard using websockets real-time data updates
- most of the build-time defines moved to WebUI controls