Development and testing environment

Arduino IDE 1.8.13 & 2.0.0-rc9.1 (almost always the former)
- Espressif, esp32, 1.0.4
  - Partition Scheme: "No OTA (2M APP/2MB FATFS)" (anything with an app of 1.9+ MB should be OK)
  - Other settings left as the board defaults.
- Espressif, esp8266, 2.4.2
- Seeed Studio, nRF52, 1.0.0
- Earle F. Philhower, Pi Pico, 2.6.3
ESP32 Dev Module (the basic one off Banggood)
LILYGO TTGO Mini 32
WeMos ESP8266 D1 mini
Pi Pico W (future)
Seeed nRF52840 (future)