Hail is an IoT development module that runs the Tock operating system. Its features:

• SAM4L Cortex-M4
• nRF51822 BLE Radio
• SI7021 Temperature and Humidity Sensor
• ISL29035 Light Sensor
• FXOS8700CQ 6-axis Accelerometer and Magnetometer
• RGB LED
• USB Programming
• Particle Photon Form-Factor and Pinout

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TockOS supports Hail. See the instructions there for how to program the Tock kernel and applications.

Hail supports a software bootloader which allows new code to be flashed over USB. The bootloader source is in the bootloader directory. The tockloader utility can flash applications using the bootloader.

There a couple steps to provision a newly populated Hail board. See the commissioning folder for more information.

By default, the nRF51822 is commissioned with the serialization application which allows softdevice commands to be sent over a UART connection from the SAM4L.