Mqtt, Unit Testing, Tcp Ip, Spi, Docker, Git, Embedded C, Tls, Python, Pwm, Uart, Gpio, Application Security, Ethernet, I2c, ADC, secure firmware upgrade, CI CD pipeline, Secure Boot loader, STM32, Zephyr ecosystem, firmware module integration testing, industrial ethernet, Arm Cortex M 32-bit microcontroller, Modbus, CAN communication