@tbot.testcase
def test_linux_simple():
    # request serial connection to Linux on the board
    with tbot.ctx.request(tbot.role.BoardLinux) as lnx:
        # now we can run commands
        lnx.exec0("uname", "-a")

        # or, for example, read a file from the target
        cmdline = (lnx.fsroot / "proc" / "cmdline").read_text()

class CustomBoardLinux(board.LinuxUbootConnector, board.LinuxBootLogin, linux.Bash):
    username = "root"
    password = None

    def do_boot(self, uboot):
        # set `autoload` env-var to false to prevent automatic DHCP-boot
        uboot.env("autoload", "false")

        # get an IP-address
        uboot.exec0("dhcp")

        # download kernel + initramfs from TFTP server
        loadaddr = 0x82000000
        uboot.exec0("tftp", hex(loadaddr), f"{tftp_ip}:{kernel_image_path}")

        # and boot it!
        return uboot.boot("bootm", hex(loadaddr))

@tbot.testcase
def test_ethernet_speed():
    with tbot.ctx() as cx:
        # boot into Linux on the board and acquire a shell-session
        lnx = cx.request(tbot.role.BoardLinux)

        # use ssh to connect to a network server to test against
        lh = cx.request(tbot.role.LabHost)

        # start iperf server
        with lh.run("iperf", "-s") as iperf_server:
            # and display its output while waiting for startup
            iperf_server.read_until_timeout(2)

            # now run iperf client on DUT
            tx_report = lnx.exec0("iperf", "-c", server_ip)

            # exit the server with CTRL-C
            tbot.log.message("Server Output:")
            iperf_server.sendcontrol("C")
            iperf_server.terminate0()