You will get Custom ESP32 IoT & FreeRTOS Solutions with Modbus and Embedded Systems
Project details
I deliver end-to-end ESP32 embedded solutions for industrial IoT and smart home applications. From firmware development in C/C++, Modbus RTU/TCP integration, and FreeRTOS multitasking to PCB design, OTA updates, and mobile/cloud integration, I provide production-ready systems that are secure, scalable, and reliable.
Clients choose my services because I combine deep embedded systems expertise with practical IoT deployment skills, delivering solutions that work out of the box and are ready for real-world deployment.
Key Highlights:
ESP32 & STM32 firmware development (C/C++ & Arduino)
Modbus RTU/TCP & industrial protocol integration
FreeRTOS-based multitasking and real-time control
Cloud & mobile app integration (MQTT, BLE, Wi-Fi)
PCB design, schematics, and hardware testing
OTA updates, encryption, and secure IoT systems
I focus on building systems that scale—from a single smart device to complex multi-device industrial setups—ensuring high reliability, maintainability, and performance.
Clients choose my services because I combine deep embedded systems expertise with practical IoT deployment skills, delivering solutions that work out of the box and are ready for real-world deployment.
Key Highlights:
ESP32 & STM32 firmware development (C/C++ & Arduino)
Modbus RTU/TCP & industrial protocol integration
FreeRTOS-based multitasking and real-time control
Cloud & mobile app integration (MQTT, BLE, Wi-Fi)
PCB design, schematics, and hardware testing
OTA updates, encryption, and secure IoT systems
I focus on building systems that scale—from a single smart device to complex multi-device industrial setups—ensuring high reliability, maintainability, and performance.
Project Type
Data Analysis, Development, Cybersecurity, Data Protection, IT, QA, User TestingWhat's included
| Service Tiers |
Starter
$100
|
Standard
$350
|
Advanced
$800
|
|---|---|---|---|
| Delivery Time | 3 days | 8 days | 15 days |
Number of Revisions | 1 | 2 | 2 |
2 reviews
(1)
(0)
(0)
(1)
(0)
This project doesn't have any reviews.
SC
Salomon C.
Jun 29, 2026
Esp mdb communication
DB
Dian B.
Jan 13, 2026
KiCAD PCB Developer
Very cooperative and helped develop the PCB during my busy phase. Appreciated his professionalism and recommend him to anyone.
About Syed Muhammad Shakaib
Embedded Systems Engineer | ESP32 PCB Design Modbus IoT Firmware
69%
Job Success
Karachi, Pakistan - 2:16 am local time
If you need embedded firmware that is stable, connected, scalable, and maintainable—let’s talk.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
WHAT I BUILD FOR CLIENTS
✅ IoT Firmware Development
End-to-end IoT firmware on ESP32, STM32, and ATSAM microcontrollers. MQTT over TLS, secure boot, OTA firmware updates, and low-power wireless design for battery-operated devices. I write firmware that runs in production — not just demos.
✅ Industrial Automation & Modbus Integration
Modbus RTU and Modbus TCP firmware for industrial sensors, VFDs, PLCs, and energy meters over RS-485. FreeRTOS multitasking with concurrent Modbus polling, PID control loops, and cloud data publishing. Built for 24/7 uptime.
✅ Cloud-Connected Embedded Systems
Full IoT pipeline: device firmware → MQTT broker → AWS IoT Core / Azure IoT Hub → time-series database → Grafana or custom dashboard. Experience with EMQX, Mosquitto, Firebase, and Docker-based deployments on Raspberry Pi.
✅ BLE & Wi-Fi Device Development
Bluetooth Low Energy (BLE) firmware for sensor devices, wearables, and gateways. BLE GATT profiles, custom services, DFU (Device Firmware Update) over BLE. Wi-Fi provisioning, WPA2 enterprise, and mesh networking on ESP32.
✅ Flutter Mobile Apps for IoT
Cross-platform iOS and Android apps that connect to your hardware via BLE, MQTT, or REST API. Real-time sensor dashboards, device configuration screens, push alerts, and OTA trigger from mobile. Flutter + Firebase or Flutter + custom backend.
✅ PCB Design for Embedded Systems
Schematic capture and PCB layout in KiCad, EasyEDA, and Altium Designer. ESP32 and STM32 custom boards, power supply design, EMC considerations, and Gerber files ready for manufacture. DFM-reviewed layouts for production.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
TECHNICAL STACK
Microcontrollers: ESP32, ESP32-S3, STM32F1/F4, ATSAM, Arduino
RTOS: FreeRTOS (tasks, queues, semaphores, timers, interrupts)
Protocols: MQTT, Modbus RTU/TCP, BLE GATT, I2C, SPI, UART, RS-485, CAN, HTTP/HTTPS
Cloud: AWS IoT Core, Azure IoT Hub, Firebase, Google Cloud IoT, EMQX
Languages: C, C++, Python, Dart (Flutter)
PCB: KiCad, EasyEDA, Altium Designer, Proteus, EasyPCB
Tools: Docker, Git, VS Code + PlatformIO, STM32CubeIDE, ESP-IDF, FreeRTOS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
INDUSTRY EXPERIENCE
HVAC Control Systems
Multi-zone HVAC automation with STM32, Modbus RTU sensors, FreeRTOS PID control, and remote monitoring via Azure IoT Hub. Designed for commercial buildings with 24/7 reliability requirements.
Energy Monitoring
Three-phase energy monitoring sensors, ESP32 firmware, MQTT data pipeline, and real-time dashboards showing voltage, current, power factor, and kWh consumption per circuit.
Industrial IoT
Modbus-based data acquisition from industrial sensors and meters. RS-485 networks with multiple slave devices, data aggregation, cloud upload, and alarm management.
Multi-Sensor Integration
Environmental monitoring systems combining temperature, humidity, pressure, CO2, and motion sensors. Wireless sensor nodes with BLE or Wi-Fi, gateway aggregation, and cloud storage.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
HOW TO GET STARTED
Message me with a brief description of your project. I respond within hours and can usually schedule a discovery call within 24 hours. For fixed-price projects, I provide a detailed scope document before any work begins — no surprises.
Shakaib Naqvi
IoT Firmware Engineer · ESP32 · STM32 · FreeRTOS · AWS IoT · Azure IoT · Flutter · Modbus · PCB Design
Steps for completing your project
After purchasing the project, send requirements so Syed Muhammad Shakaib can start the project.
Delivery time starts when Syed Muhammad Shakaib receives requirements from you.
Syed Muhammad Shakaib works on your project following the steps below.
Revisions may occur after the delivery date.
Development:
I write the Arduino code, create schematics, and perform initial testing based on the agreed specifications.