STM32L082 Development Board with SX1276 LoRa Radio, programmable using Arduino IDE via USB Connector.
The development board exposes 19 GPIOs to the user as well as 3V3, GND, VIN, and VREF (for the analog sector), has an indicator led on GPIO 13 as well as a power-on led that can be disabled via a solder jumper for lowest power usage, and has an on-board antenna suitable for either 868 or 915 MHz.
https://www.seeedstudio.com/Grasshopper-Development-Board-p-4792.html