MQTT RTU Sensor Data Firmware development

I need clean, reliable firmware that will sit on my existing RTU hardware, pull live sensor readings, and publish them to my cloud broker over MQTT. The focus is squarely on accurate data collection from... (Budget: ₹37500 - ₹75000 INR, Jobs: Bluetooth Low Energy (BLE), C Programming, Data Collection, Electronics, Embedded Systems, Firmware Development, Microcontroller, MQTT, Sensor Integration, Wireless)