Script EMMC access

I'm trying to follow this code sample to access the eMMC, but I'm getting the error below.

First, I verified that I have eMMC:

./bootloader_version.py 
Found device with name: 192.168.2.241
Version: 0.0.26
NETWORK Bootloader, is User Bootloader: False
Memory 'Memory.FLASH' size: 16777216, info: JEDEC ID: 01 20 18
Memory 'Memory.EMMC' size: 15758000128, info: 

(Note that I get nothing after 'info:' on the EMMC line above.

Second, I enabled the eMMC:

import depthai as dai

# Create pipeline
pipeline = dai.Pipeline()

# Set board config
board = dai.BoardConfig()
board.emmc = True
config = dai.Device.Config()
config.board = board
pipeline.setBoardConfig(board)

(f, bl) = dai.DeviceBootloader.getFirstAvailableDevice()
bootloader = dai.DeviceBootloader(bl)
progress = lambda p : print(f'Flashing progress: {p*100:.1f}%')
(r, errmsg) = bootloader.flash(progress, pipeline, memory=dai.DeviceBootloader.Memory.EMMC)
if r: print("Flash OK")

Now, when I run the example without modification:

import depthai as dai
import cv2

# Start defining a pipeline
pipeline = dai.Pipeline()

board = dai.BoardConfig()
board.emmc = True
pipeline.setBoardConfig(board)

# Define source and output
camRgb = pipeline.create(dai.node.ColorCamera)
jpegEncoder = pipeline.create(dai.node.VideoEncoder)

# Properties
camRgb.setResolution(dai.ColorCameraProperties.SensorResolution.THE_4_K)
jpegEncoder.setDefaultProfilePreset(1, dai.VideoEncoderProperties.Profile.MJPEG)

#Set a write script
script_write = pipeline.createScript()
script_write.setProcessor(dai.ProcessorType.LEON_CSS)
script_write.setScript("""

    import os
    index = 1000
    import time
    while True:
        # Find an unused file name first
        while True:
            path = '/media/mmcsd-0-0/' + str(index) + '.jpg'
            if not os.path.exists(path):
                break
            index += 1
        frame = node.io['jpeg'].get()
        node.warn(f'Saving to EMMC: {path}')
        with open(path, 'wb') as f:
            f.write(frame.getData())
        index += 1
        time.sleep(3)

""")
                      
#Set a read script
script_read = pipeline.createScript()
script_read.setProcessor(dai.ProcessorType.LEON_CSS)
script_read.setScript("""

    import http.server
    import socketserver
    import socket
    import fcntl
    import struct
    import os

    def get_ip_address(ifname):
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        return socket.inet_ntoa(fcntl.ioctl(
            s.fileno(),
            -1071617759,  # SIOCGIFADDR
            struct.pack('256s', ifname[:15].encode())
        )[20:24])

    # Note: `chdir` here will prevent unmount, this should be improved!
    os.chdir('/media/mmcsd-0-0')

    PORT = 80
    Handler = http.server.SimpleHTTPRequestHandler

    with socketserver.TCPServer(("", PORT), Handler) as httpd:
        ip = get_ip_address('re0')
        node.warn(f'===== HTTP file server accessible at: http://{ip}')
        httpd.serve_forever()

""")
                      
# Linking

camRgb.video.link(jpegEncoder.input)
jpegEncoder.bitstream.link(script_write.inputs['jpeg'])
script_write.inputs['jpeg'].setBlocking(False)
xout = pipeline.create(dai.node.XLinkOut)
xout.setStreamName("rgb")
script_read.outputs['jpeg'].link(xout.input)


# Pipeline defined, now the device is connected to
with dai.Device(pipeline) as device:
    # Output queue will be used to get the rgb frames from the output defined above
    qRgb = device.getOutputQueue(name="rgb", maxSize=100, blocking=False)

    while True:
        inRgb = qRgb.tryGet() 
        
        if inRgb is not None:
            cv2.imshow("rgb", inRgb.getCvFrame())
            
        if cv2.waitKey(1) == ord('q'):
            break

I get this error:

(.venv) ~/code/people-counter/try/luxonis/eMMC >  python script_emmc_access.py 
[1844301021D93E1300] [192.168.2.241] [5.683] [Script(2)] [warning] Saving to EMMC: /media/mmcsd-0-0/1000.jpg
[1844301021D93E1300] [192.168.2.241] [5.683] [Script(2)] [critical] FileNotFoundError: [Errno 2] N: '/media/mmcsd-0-0/1000.jpg'

At:
  <script>(24): <module>

Traceback (most recent call last):
  File "Users/user/code/people-counter/try/luxonis/eMMC/script_emmc_access.py", line 101, in <module>
    inRgb = qRgb.tryGet() 
RuntimeError: Communication exception - possible device error/misconfiguration. Original message 'Couldn't read data from stream: 'rgb' (X_LINK_ERROR)'

Thoughts?

To eliminate the FileNotFoundError, which I'm guessing is caused by this line:

         with open(path, 'wb') as f:

I modified the example code to this minimal version, which just starts a webserver in a script node:

# oak_filesystem.py

import depthai as dai
import cv2

# Start defining a pipeline
pipeline = dai.Pipeline()

board = dai.BoardConfig()
board.emmc = True
pipeline.setBoardConfig(board)

#Set a read script
script_read = pipeline.createScript()
script_read.setProcessor(dai.ProcessorType.LEON_CSS)
script_read.setScript("""

    import http.server
    import socketserver
    import socket
    import fcntl
    import struct
    import os

    def get_ip_address(ifname):
        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        return socket.inet_ntoa(fcntl.ioctl(
            s.fileno(),
            -1071617759,  # SIOCGIFADDR
            struct.pack('256s', ifname[:15].encode())
        )[20:24])

    # Note: `chdir` here will prevent unmount, this should be improved!
    os.chdir('/media/mmcsd-0-0')

    PORT = 80
    Handler = http.server.SimpleHTTPRequestHandler

    with socketserver.TCPServer(("", PORT), Handler) as httpd:
        ip = get_ip_address('re0')
        node.warn(f'===== HTTP file server accessible at: http://{ip}')
        httpd.serve_forever()

""")
                      
# Pipeline defined, now the device is connected to
with dai.Device(pipeline) as device:
    while True:
        if cv2.waitKey(1) == ord('q'):
            break

Now, I get this error:

[1844301021D93E1300] [192.168.2.241] [5.971] [Script(0)] [critical] FileNotFoundError: [Errno 2] N: '/media/mmcsd-0-0'

At:
  <script>(19): <module>

which I'm guessing is caused by this line:

    os.chdir('/media/mmcsd-0-0')

and if I comment out the os.chdir line, I get no errors, but when I browse the device IP address, I get:

which clearly does not have a path of /media/mmcsd-0-0

which is probably due to the note above that line.

Thoughts?

I tried the exact steps above more than 10 times before posting this.

Please answer each of my numbered questions:

1. Have you tried my EXACT steps above and copy-paste my EXACT code?
2. Should the output line Memory 'Memory.EMMC' size: 15758000128, info:have any info at the end of the line? Because my output has nothing after info:
3. Why do we need this code:

# Note: `chdir` here will prevent unmount, this should be improved!
os.chdir('/media/mmcsd-0-0')

and why do you do it only in the webserver script node, and not in the other script node as well?

4. If it is needed, then could there be a race-condition where the other script starts but the eMMC is not mounted yet?
5. Some example code has config = dai.Device.Config() config.board = board and other example code doesn't. Is it needed when running?
6. If it is already enabled by the first code I provided from the documentation, then why do we need this:

board = dai.BoardConfig()
board.emmc = True
pipeline.setBoardConfig(board)

again when running the pipeline?