Secure MQTT Protocol
Lightweight and secure messaging for real-time response
IoT QR Code Reader
Featured Portfolio
IoT QR Code Reader
Embedded Systems Internet of things
August 04, 2025
Client Overview
Dotcom IoT LLP developed the IoT QR Code Reader as a versatile, in-house access control solution.
The product is designed to enhance accessibility and security across multiple infrastructure applications, including EV charging stations and automated entry systems.
Business Need
- With the rapid adoption of EV infrastructure and smart access systems, there was a growing demand for a unified, secure, and contactless access solution.
Clients needed a single hardware module that could:
Grant EV charging access via QR code- Control physical access points like lifts, barricades, gates, and exits
- Offer remote monitoring and connectivity across network types
Dotcom Contribution
- Designed and developed the IoT QR Code Reader with a compact and robust embedded hardware system.
- Integrated ARM Cortex-M4 microcontroller with FreeRTOS for real-time task handling and low power operation.
Enabled QR Code scanning to act as an authorization mechanism for:
- EV charging stations
- Building lifts
- Parking barricades
- Entry/exit gates
- Used GPRS/4G LTE modules to provide real-time cloud connectivity even in remote areas.
- Implemented MQTT protocol for efficient and lightweight data communication with cloud systems.
- Leveraged Microsoft Azure for cloud-based device management, data logging, and remote control.
Benefits Delivered
One-step user experience: Instant access via QR code scanning, eliminating the need for RFID cards or apps.
Multi-purpose integration: Same device hardware supports EV charging and access control in commercial, residential, and industrial spaces.
Low-latency communication: Real-time control and response through 4G/GPRS and MQTT integration.
Scalable deployment: Cloud-ready system allows fleet-wide or building-wide rollouts with centralized monitoring.
Secure & reliable: Embedded C implementation on FreeRTOS ensures robust real-time operation with minimal system lag or failure.
Solution Diagram
IoT QR Code Reader Features
QR Code Access
One-tap access via printed or digital QR codes
Multi-Point Use Cases
Works across EV stations, lifts, gates, and parking systems
Secure MQTT Protocol
Lightweight and secure messaging for real-time response
