HT-HC32 Arduino Core Issues – Serial and Linking Failures

#1

Hi,
I’m testing the HT-HC32 HaLow node using the Heltec-supplied esp_halow Arduino core. The board is recognized on COM5, but any sketch — even an empty one — fails to compile due to unresolved symbols like Serial0 and HardwareSerial::setPins() .

Key issues:

  • The Heltec esp_halow core seems to link against a precompiled core.a, missing required ESP32 Arduino symbols.
  • Standard definitions like Serial0 are missing entirely.
  • Attempts to compile sketches using Heltec’s wifi-halow library result in linker errors and undefined references to core ESP32 functions.

This suggests the provided core is either out of sync with the ESP32 Arduino version it was built against, or critical core components were omitted.

Please advise on whether an updated and fully compatible version of the Arduino core is planned — or if you can share integration steps with the official ESP32 Arduino core.

Thanks!