Then maybe try out RIOT-OS. It tries to achieve the same a Zephyr but tends to be a lot simpler. All you need to do to flash an application is make BOARD=y

Then maybe try out RIOT-OS. It tries to achieve the same a Zephyr but tends to be a lot simpler. All you need to do to flash an application is make BOARD=your_board flash it has pretty good networking support (6LoWPAN) and is mostly used for sensor network applications