Development of firmware for IoT hardware (NB-IoT, BLE, MQTT)

We are developing a PoC for an IoT solution using state of the art hardware. An important deliverable is to configure the PoC hardware correctly so it communicates efficiently with the cloud solution and between devices. The cloud solution is an AWS-based MQTT broker that connects to Azure IoT, but this may be re-developed to connect directly via MQTT using Azure IoT DPS and Azure IoT Hub. There will be two types of hardware in general. Some LTE/NB-IoT gateway autonomous devices and some BLE devices that will need gateway devices to connect to the cloud. High-level tasks includes, but are not limited to: 1) Development of FW for FOTA updates via the cloud solution 2) MQTT logic for 2-way messaging 3) Trigger-based logic on devices for automatic events (change of LED colour, sound notifications) 4) BLE Mesh FW for BLE devices 5) Logic for BLE devices to connect automatically to gateways 6) Logic for FW settings (update frequency, type of device, other settings) to be changed via logic in back-end via MQTT