Zephyr & nRF Connect SDK
Product firmware on nRF54 and nRF52: devicetree, Kconfig and subsystems shared across a whole product range.
Available for new projects
Firmware for connected devices, built for the field.
I am an embedded software engineer with 4+ years of production IoT firmware. I build LoRaWAN, Bluetooth LE and industrial protocol stacks on Zephyr and ESP-IDF, and ship them with automated tests, CI and secure remote updates.
- Zephyr RTOS
- ESP-IDF
- LoRaWAN
- Bluetooth LE
- Modbus
device console
$ boot
Joined the LoRaWAN network
Modbus RTU meter read
Firmware image verified by MCUboot
Unit and QEMU tests passed in CI
$ ready
- 4+ yearsof production IoT firmware
- End to endfrom the sensor to the network server and the cloud
- Testedhost, QEMU and Twister suites running in CI
- Updatablesigned images, LoRaWAN FUOTA and BLE DFU
Expertise
From the chip to the cloud
Firmware that is designed, tested and updated like the rest of a modern product.
ESP-IDF & FreeRTOS
Multitask firmware on ESP32: Ethernet, embedded web UI, persistent settings and over-the-air updates.
LoRaWAN, end to end
Devices, multicast FUOTA, gateways and network servers such as ChirpStack, with payload codecs for the cloud.
Industrial & building protocols
Modbus RTU/TCP, BACnet, OpenTherm and DSMR P1: clients, servers and register maps that hold up on site.
Testing & CI
Host unit tests with mocks and sanitizers, QEMU integration tests on simulated hardware, Twister, GitHub Actions.
Secure updates & Bluetooth LE
MCUboot signed images, DFU over BLE, update campaigns over LoRaWAN and diagnostics over BLE.
Selected work
Firmware running in real products
Smart meters, relay controllers, heating and boiler controls, and LoRaWAN networks.
Zephyr · nRF Connect SDK
YOBIIQ B.V.
LoRaWAN & BLE firmware platform
A shared Zephyr platform behind a whole range of LoRaWAN energy devices: connectivity, configuration, storage and remote updates are written once and reused by every product.
- Zephyr RTOS
- nRF Connect SDK
- nRF54L15
- LoRaWAN
Read the case study
Smart metering · Zephyr
YOBIIQ B.V.
PEM431 smart electricity meter
Production firmware for a panel-mount power quality meter on the nRF54L15: it reads the meter over Modbus RTU, reports over LoRaWAN, and offers Bluetooth LE diagnostics and remote updates.
- Zephyr RTOS
- nRF54L15
- LoRaWAN
- FUOTA
Read the case study
Smart metering · Zephyr
YOBIIQ B.V.
DEM energy meter series
Firmware for the DEM series of DIN-rail energy meters, single-phase DEM1 and DEM2 and three-phase DEM4. It is built on the shared Zephyr platform, with LoRaWAN reporting, Bluetooth LE configuration and remote updates.
- Zephyr RTOS
- LoRaWAN
- FUOTA
- Bluetooth LE
Read the case study
Smart metering · Zephyr
YOBIIQ B.V.
iQ DSMR meter reader
Firmware for a LoRaWAN meter reader that reads real-time electricity and gas consumption from Dutch smart meters (DSMR P1) and reports it to the cloud, with Bluetooth LE configuration.
- Zephyr RTOS
- DSMR P1
- LoRaWAN
- FUOTA
Read the case study
Energy control · Zephyr
YOBIIQ B.V.
RM200 relay controller
Relay control firmware for a DIN-rail smart relay with two isolated channels: protections, weekly schedules and remote control over LoRaWAN and Bluetooth LE.
- Zephyr RTOS
- LoRaWAN
- FUOTA
- Bluetooth LE
Read the case study
Building automation · ESP32
YOBIIQ B.V.
Underfloor heating & cooling controller
Firmware of an ESP32 controller that drives heating and cooling zones in buildings. It talks to building systems over Ethernet and field buses, reports to the cloud and updates itself over the air.
- ESP32
- ESP-IDF
- FreeRTOS
- Modbus TCP/RTU
Read the case study
Heating control · Zephyr
YOBIIQ B.V.
OpenTherm boiler gateway
New Zephyr firmware for a gateway that brings OpenTherm boilers onto LoRaWAN: it relays thermostat and boiler traffic, reports boiler data and alarms, and accepts remote setpoint control. It replaces the first generation of the product.
- Zephyr RTOS
- nRF54L15
- OpenTherm
- LoRaWAN
Read the case study
Industrial IoT · LoRaWAN
OPENSNZ Technology
Private LoRaWAN network
Design and roll-out of a private LoRaWAN network for industrial IoT: from hardware selection to a monitored network in operation.
- LoRaWAN
- ChirpStack
- RAK
- Kerlink
Read the case study
Low power · STM32
MAScIR Foundation
LoRaWAN & Modbus sensor node
Firmware for a low-power LoRaWAN sensor node on a Murata module (STM32L072 + SX1276) that reads field devices over Modbus RTU.
- C
- STM32L072
- SX1276
- LoRaWAN
Read the case study
Experience
Where I have built it
Embedded Software & IoT Consultant
Jul 2023 - Present
YOBIIQ B.V. · Geleen, Netherlands · Remote
GitHub: yobiiq-fostin- Zephyr / nRF Connect SDK firmware for LoRaWAN energy devices: smart meters, relay controllers, P1 readers
- Shared LoRaWAN & BLE platform: uplinks, downlinks, multicast FUOTA, BLE DFU, MCUboot
- ESP32 heating & cooling controller (ESP-IDF, FreeRTOS): Ethernet web UI, Modbus TCP/RTU, BACnet, MQTT OTA, OpenTherm
- Test & CI: Twister, host unit tests with mocks and sanitizers, QEMU integration tests, GitHub Actions
- JavaScript payload codecs, ThingsBoard dashboards, technical manuals, prototype validation
IoT Engineer
Nov 2022 - Jun 2023
OPENSNZ Technology · Oujda, Morocco
- Private LoRaWAN network: hardware selection, RAK & Kerlink gateways, ChirpStack
- Sensor integration, testing, monitoring with MQTT and Grafana, operations
Embedded Software Intern
Feb 2022 - Jul 2022
MAScIR Foundation · Rabat, Morocco
- Modbus RTU client & LoRaWAN stack on STM32L072 + SX1276, low-power operation
- Reverse engineering of a weather data logger authentication algorithm
Approach
How a project runs
Clear steps, visible progress and firmware you can maintain after I leave.
- 1
Scope
Requirements, constraints and a test plan, agreed before the first line of code.
- 2
Architect
Clear modules, documented interfaces and a build that stays free of warnings.
- 3
Build & test
Features delivered with unit and integration tests that run on every change.
- 4
Ship & support
Signed releases, remote updates, documentation and follow-up in the field.
Skills
Tools of the trade
Languages
- C
- C++
- Python
- JavaScript
- Bash
RTOS & SDKs
- Zephyr
- nRF Connect SDK
- ESP-IDF
- FreeRTOS
- ThreadX
- STM32Cube HAL
- Bare metal
Connectivity
- LoRaWAN
- FUOTA
- Bluetooth LE
- Wi-Fi
- Ethernet
- 3G/4G
- MQTT
- HTTP
Field protocols
- Modbus RTU/TCP
- BACnet
- OpenTherm
- DSMR P1
Buses
- UART
- I2C
- SPI
- I2S
- CAN
- LIN
- USB
Hardware
- nRF54
- nRF52
- STM32
- ESP32
- PSoC 6
- SX126x / SX127x
- Raspberry Pi
Testing & CI
- Twister
- Unity
- CMock
- QEMU
- pytest
- GitHub Actions
- Docker
Tools
- Git
- CMake
- west
- SEGGER J-Link
- VS Code
- Doxygen
- Claude Code
IoT platforms
- ChirpStack
- ThingsBoard
- Grafana
Education
Engineering background
Engineering Degree, Embedded Systems & Digital Services
Sep 2019 - Jul 2022
INPT, National Institute of Posts and Telecommunications · Rabat, Morocco
Microcontrollers, embedded OS, DSP, VHDL, PCB design, AUTOSAR, ISO 26262, MISRA C
DEUST, Science and Technology
Sep 2017 - Jul 2019
Faculty of Sciences and Techniques · Fez, Morocco
Languages
- French · Fluent
- English · Intermediate
Let's build your next connected product
Tell me about your device, your constraints and your timeline.