PlatformIO OSS May Updates: New boards and dev-kits, Espressif ESP-IDF 4.2.1, Updated Arduino Cores for ESP8266, STMicroelectronics STM32, and Mbed-enabled devices

Welcome to the May 2021 updates of the PlatformIO Open Source professional collaborative platform for embedded development. This month we received a lot of helpful feedback from our community, which let us identify the most important parts of our OSS ecosystem that required our attention, so let’s go through the updates pushed in this month. Read more :point_right: