firmware/src/main.c


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#include <stdbool.h>

#include <zephyr/kernel.h>
#include <zephyr/device.h>
#include <zephyr/drivers/uart.h>

#define UART_DEVICE_NODE DT_CHOSEN(zephyr_shell_uart)
static const struct device *const uart_dev = DEVICE_DT_GET(UART_DEVICE_NODE);

#define SLIP_END 0xC0

int main(void)
{
	if (!device_is_ready(uart_dev)) {
		printk("UART device not found!");
		return 0;
	}

	while (true) {
		k_sleep(K_MSEC(1000));
		uart_poll_out(uart_dev, SLIP_END);
	}

	return 0;
}