possible chips:

• nRF52832 is RedBearLabs Nano v2
• Nordic beacon: NRF51822

GCC:

• GCC with Nordic Beacon
• https://www.allaboutcircuits.com/projects/ble-using-nrf51-arm-gcc-build-environment/
• https://devzone.nordicsemi.com/blogs/22/getting-started-with-nrf51-development-on-mac-os-x/

misc:

• ble primer (adafruit)
• argenox ble primer
• BLE specifications of GAP (Generic Access Profile)
• Nordic BLE tutorial
• digikey intro to BLE security
• sniffer guide