Need help with Xmodem

[rahul007-bit]

Hi Everyone, Currently, I am working on my university project were, we have to transfer an image via Zigbee XBee Module S2C.

So, I am trying to use the Xmodem (https://xbplib.readthedocs.io/en/latest/api/digi.xbee.util.xmodem.html) protocol but cannot understand how to use it.

Sender Code

def write_cb(Bytearray):
    try:
        device.send_data(remote_device, Bytearray)
        time.sleep(0.25)
        return True
    except Exception as e:
        print(e)
        return False


def read_cb(size_read, timeout):
    message = device.read_data_from(remote_device, timeout=timeout)
    print(message)
    return message
try:
    device.open()

    # Obtain the remote XBee device from the XBee network.
    xbee_network = device.get_network()
    remote_device = xbee_network.discover_device(REMOTE_NODE_ID)
    if remote_device is None:
        print("Could not find the remote device")
        exit(1)

    send_file_ymodem(FILE, write_cb=write_cb, read_cb=read_cb)

    print("Success")


finally:
    if device is not None and device.is_open():
        device.close()

Receiver Code

def write_cb(Bytearray):
  try:
      res = device.send_data_async(remote_device,Bytearray)
      print(res)
      if res:
          return True
      else:
          return False
  except Exception as e:
      print(e)
      return False

def read_cb(size_read, timeout):
  try:
      size_read = device.read_data_from(remote_device, timeout=timeout)
      return size_read
  except Exception as e:
      print(e)
      return None

try:
    device.open()
    xbee_network = device.get_network()
    remote_device = xbee_network.discover_device(REMOTE_NODE_ID)
    if remote_device is None:
        print("Could not find the remote device")
        exit(1)

    get_file_ymodem(FILE, write_cb, read_cb)
    print("Waiting for data...\n")
    input()

finally:
    if device is not None and device.is_open():
        device.close()

This is what I have tried till now, you may have guessed till now it's not going to work, so please guide me 🙏🏼 🥺.

Your reply will be like thor's hammer for which I am worthy(I assume).

any example will help a lot.

Thank You, waiting for your reply 🤗!!

[sandeep1404]

Can you able to achive this?

[rahul007-bit]

Yes, I was able to complete the project. I managed to transfer images or audio files using the Zigbee XBee Module S2C. However, I cannot recall the exact solution I used. If you would like to know my approach, please let me know.

[sandeep1404]

Hi @rahul007-bit, That's great that you could transfer images using ZigBee, If u don't mind can u send the documentation or related work that you have done to transfer images using the xbee module, It would really help my project. My mail ID is : [email protected] can you please guide me in this regard? It would be a great help for me. Thank you.

[rahul007-bit]

I can send you the file I used, but it would be difficult to provide the supporting documents since it has been a long time since I worked on this project.

[rahul007-bit]

Xbee.zip

@sandeep1404

[sandeep1404]

Thank you so much @rahul007-bit. for the help. Will check that and let you know if i get any issues. Thank you.

[sandeep1404]

Hi @rahul007-bit , do you remember anything like, what is the resolution of the image you sent and what is the transmission rate, data rate and how much time it took for you to transmit the image from one xbee to other xbee.

[rahul007-bit]

Yeah, it was very very slow even for transferring a 100kb image, since this project just to prove to my group that we can transfer images. for testing, I used an image of 1kb image which was a very low resolution. if you want to transfer images over radio waves you also check sstv.

[sandeep1404]

Yeah, even i am working on Image transmission using radio modules, i was trying with Zigbee and Lora, but since datarate is the issue, it cannot able to transfer higher-resolution images, so checking for some resources where I can transfer my image at a faster rate, since I was not allowed to use the internet.