STM32 Industrial Sensor Hardware Design

I need a robust hardware platform built around an STM32 MCU that can sit inside a power-plant environment, pull data from existing equipment over RS-232 and RS-485, and forward it through a Quectel EC200 LTE module using an eSIM... (Budget: ₹37500 - ₹75000 INR, Jobs: Circuit Design, Electrical Engineering, Electronics, Embedded Systems, Industrial Design, Microcontroller, PCB Design and Layout, PCB Layout, Prototyping, STM32)