Raspberry Pi Battery Swap Gateway

I’m replacing a bulky PLC in my six-slot battery-swapping station with a Raspberry Pi (or any reliable Linux SBC) and need end-to-end gateway firmware written in Python or Node.js. Core functions I must... (Budget: ₹12500 - ₹37500 INR, Jobs: Bluetooth Low Energy (BLE), Firmware Development, Linux, Mobile App Development, MQTT, Node.js, Python, Raspberry Pi)