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This tutorial shows how to configure the MQTT modules to publish and process filesfiles using both the manual and auto publish methods.

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• • Name
    • By default a unique name will be set for this File Record. You can edit this if you choose but it must be unique.
  • Tag Provider
    • This is the tag provider where the publish control and information tags will be created. In our example, set to 'default'.
  • Tag Folder Path 
    • This is the tag folder in the specified tag provider where the publish control and information tags will be created.
    • In our exampleexamples, set to 'files_manual' if configuring for manual publish or 'files_auto' if configuring for auto publish
  • Enable Auto-Publish
    • This will enable auto_publish. Leave unchecked if publishing manually
    • In our examples, leave unchecked if configuring for manual publish and check if configuring for auto publish.  
  • Group ID
    • Use the Group ID from your Transmitters Sparkplug ID. For this example, My MQTT Group
  • Edge Node ID:
    • Use the Edge Node ID from your Transmitters Sparkplug ID. For this example, Edge Node faec7e 

      
      

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After the configuration is saved, it should look similar to below:

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Manual Publish

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of Files

With a File record created following the steps in Configure MQTT Transmission to publish files with the 'Enable Auto-Publish' unchecked and the Tag Folder Path set to "files_manual", everything should At this point, everything should be configured to send files from MQTT Transmission to MQTT Engine.

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Auto Publish of Files

Create With a File record created following the steps in Configure MQTT Transmission to publish files checking the with 'Enable Auto-Publish' checked and configuring the Tag Folder Path set to "files_auto".
At this point, everything should be configured to send files from MQTT Transmission to MQTT Engine.

Open Ignition Designer on the system running MQTT Transmission. You should see the control and information tags created in the specified tag provider and folder as shown below:

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The control and information tags created in the folder are:

At this point, we just need to tell MQTT Transmission which folder contains the file(s) to

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publish. Download and unzip this sample file to some location and note that location.

This sample_file.zip contains two text files which are:

• sample_file.txt

  • This is a text file with an arbitrary string. But, it could be a file of any type. This is purely for demonstration purposes.

• sample_file.txt.md5

  • This is a text file that contains only the md5 sum of the sample_file.txt

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ubuntu@linux-host:~$ md5sum myfile.bin
07180622a24ebf905cf5f770cd54197a  myfile.bin

# In the above example, the md5 sum is: 07180622a24ebf905cf5f770cd54197a

user@osxhost:~$ md5 sample_file.txt
MD5 (sample_file.txt) = 85324ffbcc7d97c478adf53796aff787

# In the above example, the md5 sum is: 85324ffbcc7d97c478adf53796aff787

Get-FileHash -Algorithm MD5 .\some_file.iso

Algorithm       Hash                                                                   Path                                                                              
---------       ----                                                                   ----                                                                              
MD5             80FD169D3FDADBC97E66C168F796B1BF                                       C:\temp\some_file.iso

# In the above example, the md5 sum is: 80FD169D3FDADBC97E66C168F796B1BF

import hashlib

# File to create md5 sum
file_name = "D:\MyFiles\test_file.txt"

# Open,close, read file and calculate MD5 on its contents 
with open(file_name, 'rb') as file_to_check:
    # read contents of the file
    data = file_to_check.read()    
    # pipe contents of the file through
    md5_returned = hashlib.md5(data).hexdigest()
    
# Save md5 sum file
f = open(file_name + ".md5", "w")
f.write(md5_returned)
f.close()

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