Unsupported CPUs / Boards

[benpicco]

This might be a low hanging fruit based on EFR32MG21:

Zigbee 3.0 USB Dongle

itead, $6.99

• 80 MHz Cortex-M33 (EFR32MG21A020F768IM32)
• 768k Flash
• 64k RAM
• 802.15.4 radio
• BLE radio