Umer Arshad

The company needed a high availability system that could ensure continuous operations and eliminate single points of failure.

As the C++ developer for this project, I built the core service. I used the POSIX library to create TCP/UDP and multicast-based server/client. I additionally included a ping-pong mechanism to monitor the status of the nodes in the cluster continuously.

Besides that, I developed a monitoring system that continuously tracked the state of all the services involved in the holistic architecture and triggered specified actions based on various independent services issues.

I developed a home automation system that included an Android application to control and send the commands to the main controller.

The system's brain contains a Raspberry Pi that stores the data and acts as a gateway routing commands from the Android application to the physical devices connected with the appliance. Edge devices that connect directly to appliances communicate with the Raspberry Pi via RF. The system can be controlled by cellphone using the internet and a standard LAN network.

Worked as a sole engineer to develop firmware for LILYGO T5-4.7 inch E-Paper ESP32 V3 from scratch.

I implemented a device reset dispatcher to distinguish between a deep-sleep startup and a hard reset, and a captive portal for the ESP32 access point configuration.

Created a mock Python server using Flask to interact with and send commands to the ESP32, and worked on developing a Node.js-based parser to transform HTML, CSS, and JavaScript files into C strings.

Developed code to display static and dynamically obtained pictures from an external server on the Lilygo screen. Configured timeout and buttons as wake-up sources from deep-sleep modes.

Lastly, added the following:

• Dynamic capability to show nearby networks on the captive portal at runtime.
• A feature to download firmware from an external server (FOTA).
• Support for deep sleep mode to conserve battery
• Battery level detection to warn users about low battery levels

I developed an electronic locking device called "E-locked" that controls gate locks upon receiving a command from an Android application via TCP sockets or through the internet via MQTT. It supports multiple locks to be operated from a single device. The locks are password-protected and can only be modified using a master key. Keys are encrypted and then stored in the cellphone.

Developed a Flask-based REST server to start, stop, and receive alerts about multiple camera streams. Integration with the AI logic to detect SOP violations and save pictures and videos on Amazon S3 using Boto 3.

A Python-based GUI application that I created for a Raspberry Pi-powered egg storage system, incorporating a Qt-based interface for Windows. The application displays multiple temperature channels and includes a control interface to fine-tune the temperature sensor, utilizing the MCC-128 Raspberry Pi for sensor interfacing. I established a REST server on the Raspberry Pi to facilitate real-time monitoring, transmitting temperature data to the PC application. Additionally, I implemented functionality in the PC application to systematically save temperature data into a CSV file, ensuring comprehensive record-keeping for efficient system management.

As an IoT engineer, I developed firmware support for an ESP32-based servo driver (Waveshare), enabling seamless integration with AWS IoT for remote device management and control.

I also designed and implemented a dedicated firmware system for precise servo motor control, leveraging AWS IoT for real-time communication and command execution.

Finally, I enhanced firmware scalability by transforming it into a plug-and-play solution, allowing users to flash the firmware and deploy immediately without additional configuration.