V2Gdecoder

V2Gdecoder is a tool aimed to encode and decode V2G messages that commonly use EXI to compress exchanged XML files between a car Power-Line Communication module and a charging station.

This tool is based on RISE V2G shared library to easily parse messages.

A release is available with a compiled Java Runtime binary there: https://github.com/FlUxIuS/V2Gdecoder/releases

How to use

V2Gdecoder supports many methods to encode XML/decode EXI data as follows:

$ java -jar V2Gdecoder.jar -h
Unrecognized option: -h
usage: V2GEXI Helper
 -e,--exi            EXI format
 -f,--file <arg>     input file path
 -o,--output         output file in a dedicated path
 -s,--string <arg>   string to decode
 -w,--web            Webserver
 -x,--xml            XML format

To get it work, the directory "./schemas", containing V2G grammar, should be in tool's root directory.

Decoding data

A compressed EXI data can be decoded as follows:

$ java -jar V2Gdecoder.jar -e -s 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
<?xml version="1.0" encoding="UTF-8"?><ns7:V2G_Message xmlns:ns7="urn:iso:15118:2:2013:MsgDef" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns3="http://www.w3.org/2001/XMLSchema" xmlns:ns4="http://www.w3.org/2000/09/xmldsig#" xmlns:ns5="urn:iso:15118:2:2013:MsgBody" xmlns:ns6="urn:iso:15118:2:2013:MsgDataTypes" xmlns:ns8="urn:iso:15118:2:2013:MsgHeader"><ns7:Header><ns8:SessionID>41FE1835EEB99776</ns8:SessionID><ns4:Signature><ns4:SignedInfo><ns4:CanonicalizationMethod Algorithm="http://www.w3.org/TR/canonical-exi"/><ns4:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha256"/><ns4:Reference Id="id1" URI="#id1"><ns4:Transforms><ns4:Transform Algorithm="http://www.w3.org/TR/canonical-exi"/></ns4:Transforms><ns4:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ns4:DigestValue>stU7nW+JVCDxgXi4tMdOJo812VftYJwTeJ3TUEqZZBU=</ns4:DigestValue></ns4:Reference></ns4:SignedInfo><ns4:SignatureValue/></ns4:Signature></ns7:Header><ns7:Body><ns5:ChargeParameterDiscoveryRes><ns5:ResponseCode>OK</ns5:ResponseCode><ns5:EVSEProcessing>Finished</ns5:EVSEProcessing><ns6:SAScheduleList><ns6:SAScheduleTuple><ns6:SAScheduleTupleID>1</ns6:SAScheduleTupleID><ns6:PMaxSchedule><ns6:PMaxScheduleEntry><ns6:RelativeTimeInterval><ns6:start>0</ns6:start><ns6:duration>7200</ns6:duration></ns6:RelativeTimeInterval><ns6:PMax><ns6:Multiplier>3</ns6:Multiplier><ns6:Unit>W</ns6:Unit><ns6:Value>11</ns6:Value></ns6:PMax></ns6:PMaxScheduleEntry></ns6:PMaxSchedule><ns6:SalesTariff ns6:Id="id1"><ns6:SalesTariffID>1</ns6:SalesTariffID><ns6:SalesTariffEntry><ns6:RelativeTimeInterval><ns6:start>0</ns6:start></ns6:RelativeTimeInterval><ns6:EPriceLevel>1</ns6:EPriceLevel></ns6:SalesTariffEntry><ns6:SalesTariffEntry><ns6:RelativeTimeInterval><ns6:start>1800</ns6:start></ns6:RelativeTimeInterval><ns6:EPriceLevel>4</ns6:EPriceLevel></ns6:SalesTariffEntry><ns6:SalesTariffEntry><ns6:RelativeTimeInterval><ns6:start>3600</ns6:start></ns6:RelativeTimeInterval><ns6:EPriceLevel>2</ns6:EPriceLevel></ns6:SalesTariffEntry><ns6:SalesTariffEntry><ns6:RelativeTimeInterval><ns6:start>5400</ns6:start></ns6:RelativeTimeInterval><ns6:EPriceLevel>3</ns6:EPriceLevel></ns6:SalesTariffEntry></ns6:SalesTariff></ns6:SAScheduleTuple></ns6:SAScheduleList><ns6:DC_EVSEChargeParameter><ns6:DC_EVSEStatus><ns6:NotificationMaxDelay>0</ns6:NotificationMaxDelay><ns6:EVSENotification>None</ns6:EVSENotification><ns6:EVSEIsolationStatus>Valid</ns6:EVSEIsolationStatus><ns6:EVSEStatusCode>EVSE_Ready</ns6:EVSEStatusCode></ns6:DC_EVSEStatus><ns6:EVSEMaximumCurrentLimit><ns6:Multiplier>0</ns6:Multiplier><ns6:Unit>A</ns6:Unit><ns6:Value>32</ns6:Value></ns6:EVSEMaximumCurrentLimit><ns6:EVSEMaximumPowerLimit><ns6:Multiplier>3</ns6:Multiplier><ns6:Unit>W</ns6:Unit><ns6:Value>63</ns6:Value></ns6:EVSEMaximumPowerLimit><ns6:EVSEMaximumVoltageLimit><ns6:Multiplier>0</ns6:Multiplier><ns6:Unit>V</ns6:Unit><ns6:Value>400</ns6:Value></ns6:EVSEMaximumVoltageLimit><ns6:EVSEMinimumCurrentLimit><ns6:Multiplier>0</ns6:Multiplier><ns6:Unit>A</ns6:Unit><ns6:Value>16</ns6:Value></ns6:EVSEMinimumCurrentLimit><ns6:EVSEMinimumVoltageLimit><ns6:Multiplier>0</ns6:Multiplier><ns6:Unit>V</ns6:Unit><ns6:Value>230</ns6:Value></ns6:EVSEMinimumVoltageLimit><ns6:EVSEPeakCurrentRipple><ns6:Multiplier>0</ns6:Multiplier><ns6:Unit>A</ns6:Unit><ns6:Value>0</ns6:Value></ns6:EVSEPeakCurrentRipple></ns6:DC_EVSEChargeParameter></ns5:ChargeParameterDiscoveryRes></ns7:Body></ns7:V2G_Message>

By using parameters like "file" and "output", data can be taken from input file and exported in an output path respectively.

Encoding data

In the inverse, the encoding feature can be used as follows:

$ java -jar V2Gdecoder.jar -x -s '<?xml version="1.0" encoding="UTF-8"?><ns4:supportedAppProtocolReq xmlns:ns4="urn:iso:15118:2:2010:AppProtocol" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns3="http://www.w3.org/2001/XMLSchema"><AppProtocol><ProtocolNamespace>urn:din:70121:2012:MsgDef</ProtocolNamespace><VersionNumberMajor>2</VersionNumberMajor><VersionNumberMinor>0</VersionNumberMinor><SchemaID>0</SchemaID><Priority>1</Priority></AppProtocol><AppProtocol><ProtocolNamespace>urn:iso:15118:2:2013:MsgDef</ProtocolNamespace><VersionNumberMajor>2</VersionNumberMajor><VersionNumberMinor>0</VersionNumberMinor><SchemaID>1</SchemaID><Priority>2</Priority></AppProtocol></ns4:supportedAppProtocolReq>'

8000DBAB9371D3234B71D1B981899189D191818991D26B9B3A232B30020000000001D75726E3A69736F3A31353131383A323A323031333A4D73674465660040000080880

Using the web service

The tool can be runned as follows:

$ java -jar V2Gdecoder_test.jar -w

This opens a local port TCP 9000.

You can then use your favorite tool/interpreter to send EXI data to get the reply as follows:

In [1]: import requests
In [2]: r = requests.post("http://localhost:9000", headers={"Format":"EXI"}, data="809802107f860d7bae65d
    ...: d8a891a1d1d1c0e8bcbddddddcb9dcccb9bdc99cbd5148bd8d85b9bdb9a58d85b0b595e1a50d5a1d1d1c0e8bcbdddddd
    ...: cb9dcccb9bdc99cbcc8c0c0c4bcc0d0bde1b5b191cda59cb5b5bdc9948d958d91cd84b5cda184c8d4d9002b4b2189062
    ...: 3696431024687474703a2f2f7777772e77332e6f72672f54522f63616e6f6e6963616c2d6578694852d0e8e8e0745e5e
    ...: eeeeee5cee665cdee4ce5e646060625e60685ef0dad8cadcc646e6d0c2646a6c84165aa773adf12a841e302f171698e9
    ...: c4d1e6bb2afdac13826f13ba6a09532c82a2841400000000000501c030a0161005696431001000100240880e20108120
    ...: 3840110260a88032940000081030c08018503f03102400c0c3010031039804461800080")
In [3]: r.text
Out[3]: u'<?xml version="1.0" encoding="UTF-8"?><ns7:V2G_Message xmlns:ns7="urn:iso:15118:2:2013:MsgDef" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ns3="http://www.w3.org/2001/XMLSchema" xmlns:ns4="http://www.w3.org/2000/09/xmldsig#" xmlns:ns5="urn:iso:15118:2:2013:MsgBody" xmlns:ns6="urn:iso:15118:2:2013:MsgDataTypes" xmlns:ns8="urn:iso:15118:2:2013:MsgHeader"><ns7:Header><ns8:SessionID>41FE1835EEB99776</ns8:SessionID><ns4:Signature><ns4:SignedInfo><ns4:CanonicalizationMethod Algorithm="http://www.w3.org/TR/canonical-exi"/><ns4:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha256"/><ns4:Reference Id="id1" URI="#id1"><ns4:Transforms><ns4:Transform Algorithm="http://www.w3.org/TR/canonical-exi"/></ns4:Transforms><ns4:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ns4:DigestValue>stU7nW+JVCDxgXi4tMdOJo812VftYJwTeJ3TUEqZZBU=</ns4:DigestValue></ns4:Reference></ns4:SignedInfo><ns4:SignatureValue/></ns4:Signature></ns7:Header><ns7:Body><ns5:ChargeParameterDiscoveryRes><ns5:ResponseCode>OK</ns5:ResponseCode><ns5:EVSEProcessing>Finished</ns5:EVSEProcessing><ns6:SAScheduleList><ns6:SAScheduleTuple><ns6:SAScheduleTupleID>1</ns6:SAScheduleTupleID><ns6:PMaxSchedule><ns6:PMaxScheduleEntry><ns6:RelativeTimeInterval><ns6:start>0</ns6:start><ns6:duration>7200</ns6:duration></ns6:RelativeTimeInterval><ns6:PMax><ns6:Multiplier>3</ns6:Multiplier><ns6:Unit>W</ns6:Unit><ns6:Value>11</ns6:Value></ns6:PMax></ns6:PMaxScheduleEntry></ns6:PMaxSchedule><ns6:SalesTariff ns6:Id="id1"><ns6:SalesTariffID>1</ns6:SalesTariffID><ns6:SalesTariffEntry><ns6:RelativeTimeInterval><ns6:start>0</ns6:start></ns6:RelativeTimeInterval><ns6:EPriceLevel>1</ns6:EPriceLevel></ns6:SalesTariffEntry><ns6:SalesTariffEntry><ns6:RelativeTimeInterval><ns6:start>1800</ns6:start></ns6:RelativeTimeInterval><ns6:EPriceLevel>4</ns6:EPriceLevel></ns6:SalesTariffEntry><ns6:SalesTariffEntry><ns6:RelativeTimeInterval><ns6:start>3600</ns6:start></ns6:RelativeTimeInterval><ns6:EPriceLevel>2</ns6:EPriceLevel></ns6:SalesTariffEntry><ns6:SalesTariffEntry><ns6:RelativeTimeInterval><ns6:start>5400</ns6:start></ns6:RelativeTimeInterval><ns6:EPriceLevel>3</ns6:EPriceLevel></ns6:SalesTariffEntry></ns6:SalesTariff></ns6:SAScheduleTuple></ns6:SAScheduleList><ns6:DC_EVSEChargeParameter><ns6:DC_EVSEStatus><ns6:NotificationMaxDelay>0</ns6:NotificationMaxDelay><ns6:EVSENotification>None</ns6:EVSENotification><ns6:EVSEIsolationStatus>Valid</ns6:EVSEIsolationStatus><ns6:EVSEStatusCode>EVSE_Ready</ns6:EVSEStatusCode></ns6:DC_EVSEStatus><ns6:EVSEMaximumCurrentLimit><ns6:Multiplier>0</ns6:Multiplier><ns6:Unit>A</ns6:Unit><ns6:Value>32</ns6:Value></ns6:EVSEMaximumCurrentLimit><ns6:EVSEMaximumPowerLimit><ns6:Multiplier>3</ns6:Multiplier><ns6:Unit>W</ns6:Unit><ns6:Value>63</ns6:Value></ns6:EVSEMaximumPowerLimit><ns6:EVSEMaximumVoltageLimit><ns6:Multiplier>0</ns6:Multiplier><ns6:Unit>V</ns6:Unit><ns6:Value>400</ns6:Value></ns6:EVSEMaximumVoltageLimit><ns6:EVSEMinimumCurrentLimit><ns6:Multiplier>0</ns6:Multiplier><ns6:Unit>A</ns6:Unit><ns6:Value>16</ns6:Value></ns6:EVSEMinimumCurrentLimit><ns6:EVSEMinimumVoltageLimit><ns6:Multiplier>0</ns6:Multiplier><ns6:Unit>V</ns6:Unit><ns6:Value>230</ns6:Value></ns6:EVSEMinimumVoltageLimit><ns6:EVSEPeakCurrentRipple><ns6:Multiplier>0</ns6:Multiplier><ns6:Unit>A</ns6:Unit><ns6:Value>0</ns6:Value></ns6:EVSEPeakCurrentRipple></ns6:DC_EVSEChargeParameter></ns5:ChargeParameterDiscoveryRes></ns7:Body></ns7:V2G_Message>'

Issues when decoding data

XML definition schemas are available in the "./schemas" directory. Unfortunately, a lot of constructors use very old definitions. To fix the issue, you can make your own definition or try to contact us for more information.