Bluetooth Low Energy support in Amazon FreeRTOS and a new MQTT library are now generally available in Amazon FreeRTOS 201906.00 Major. You can securely connect Amazon FreeRTOS devices using Bluetooth Low Energy to AWS IoT via Android and iOS devices, and use the new MQTT library to create applications that are independent of the connectivity protocol, such as Bluetooth Low Energy or Wi-Fi.  

from Recent Announcements https://aws.amazon.com/about-aws/whats-new/2019/06/bluetooth-low-energy-support-amazon-freertos-now-available/