Thoughts on the current state of ASN.1 and XML technologies.

Posts Tagged V2X J2735 ITS

Easy V2X Conversions with Python

You can now use Python and our V2X ASN.1 API to easily convert binary V2X messages to text – whether JSON or XML – and vice versa.

Our V2X API is a C++ API, but the latest update provides a Python wrapper that can be used to convert V2X ASN.1-encoded data. There are three classes, each with methods for converting between binary (unaligned PER) and text (JSON or XML), in either direction.  The classes are:

  • For SAE J2735 DSRC (Dedicated Short Range Communications):
    • MessageFrame
  • For ETSI ITS:
    • CAM (Cooperative Awareness Message), ETSI EN 302 637-2
    • DENM (Decentralized Environmental Notification Message), ETSI EN 302 637-3

The API kit includes a sample Python program that handles things like using files for input/output and working with hexadecimal representations of the binary data, but at the end of the day, the conversion itself is simple, using one of the following function calls:

  • binary to JSON: buf = cls.to_json(inp_data, len(inp_data))
  • binary to XML: buf = cls.to_xml(inp_data, len(inp_data))
  • JSON to binary: buf = cls.from_json(inp_data)
  • XML to binary: cls.from_xml(inp_data)

(where cls is one of the provided classes: MessageFrame, CAM, or DENM.)

Download our V2X ASN.1 API and give it try!  Be sure to choose one of the 64-bit downloads, as the Python wrapper is not available for 32-bit systems.  Full documentation for the API is available on our website and included in the download.

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