IoT nodes
Sensor-to-cloud firmware handling connectivity, telemetry and OTA updates.
Embedded Firmware Development
C/C++ firmware for ESP32, ESP32-S3, STM32 and Arduino-compatible hardware — the drivers, protocols and application logic that make a board actually do something.
Overview
What this service covers
Firmware sits alongside PCB design as one of the two core engineering disciplines behind every product we build — and it gets its own page here because it's often the harder half of the job. We write embedded C/C++ for ESP32, ESP32-S3, STM32 and Arduino-compatible targets: sensor drivers, communication protocols, power management and the application logic that ties them together, developed and debugged on real hardware rather than left as a simulation.
Client Problems
Problems this service solves
- Hardware is built but there's no firmware for it yet.
- Existing firmware is unstable, undocumented, or was written by someone no longer available.
- A board needs a new communication protocol or sensor driver added.
- Firmware works on the bench but behaves inconsistently once it's actually in the field.
- A product needs OTA updates added after shipping without them.
Capabilities
What we do
- Embedded C/C++ firmware architecture
- ESP32, ESP32-S3, STM32 and Arduino-compatible firmware
- Device drivers for sensors, displays and motor controllers
- Communication protocols: SPI, I²C, UART, CAN, RS-485, BLE, Wi-Fi, LoRa
- MQTT integration for cloud-connected devices
- State-machine based application logic
- Hardware-in-the-loop debugging, not just simulation
- Firmware optimisation for power and memory-constrained targets
- OTA update support
Technologies
Tools & platforms
We build on the Espressif IDF and Arduino frameworks for ESP32/ESP32-S3, and STM32 HAL-based development for STM32 targets, with JTAG/SWD hardware debugging used to diagnose issues that only show up on the actual board.
ESP-IDFArduino FrameworkSTM32 HALBLE / Wi-Fi / LoRaMQTT
Development Process
How we approach a firmware project
- 01Requirements & interfaces
Confirm what the firmware needs to do and which peripherals/protocols it touches.
- 02Architecture & drivers
Design the firmware structure and the drivers it depends on.
- 03Implementation
Write and unit-test the firmware against the target hardware.
- 04Field validation
Debug on real hardware and confirm behaviour under actual operating conditions.
Deliverables
What you receive
- Firmware source code
- Build and flashing instructions
- Protocol and interface documentation
- Debugging and test notes
Applications
Where this is used
Industrial controllers
Firmware for automation hardware talking RS-485/Modbus on a plant floor.
Wireless & RF nodes
LoRa and UWB firmware for long-range telemetry and indoor positioning.
Related Services
Often paired with
PCB Design
The board this firmware runs on.
ESP32 & UWB Development
ESP32-specific firmware, ranging and wireless connectivity.
IoT Product Development
Firmware as part of a complete connected product.
Want more background first? Read Firmware Development Best Practices for Reliable Embedded Systems.
Discuss Your Firmware Requirements
Send your hardware details and what the firmware needs to do.