Rtos, Mqtt, Embedded C, Spi, Jtag, I2c, Uart, Version Control, Memory Management, Ble, Logic analysers, Peripheral drivers, Oscilloscopes, Embedded system architecture, Firmware validation strategies, SWD debuggers, MQTTS, STM32, GSM-based communication, Wi-Fi, Debugging and troubleshooting, Multitasking, OTA firmware updates, Interrupts, ESP32