feat: add 1.6 security extension datatypes (#531)

Add missing datatypes from 1.6 security extension whitepaper.

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Change log
 
+
+- [#531] (https://github.com/mobilityhouse/ocpp/pull/531) Add 1.6 security extension datatypes
+=======
 - [#528](https://github.com/mobilityhouse/ocpp/issues/528) v2.0.1 CertificateHashDataChainType childCertificateHashData requires the default of None
 - [#510](https://github.com/mobilityhouse/ocpp/issues/510) v2.0.1 UnitOfMeasureType - Enums missing and update docstring to allow use for variableCharacteristics
 - [#508](https://github.com/mobilityhouse/ocpp/issues/508) Exception - OccurrenceConstraintViolationError doc string correction

ocpp/v16/datatypes.py

@@ -7,6 +7,7 @@
     ChargingProfilePurposeType,
     ChargingRateUnitType,
     CiStringType,
+    HashAlgorithm,
     Location,
     Measurand,
     Phase,
@@ -121,3 +122,45 @@ class MeterValue:
 
     timestamp: str
     sampled_value: List[SampledValue]
+
+
+# Security Extension
+
+
+@dataclass
+class CertificateHashData:
+    """
+    CertificateHashDataType is used by:
+    DeleteCertificate.req, GetInstalledCertificateIds.conf
+    """
+
+    hash_algorithm: HashAlgorithm
+    issuer_name_hash: str
+    issuer_key_hash: str
+    serial_number: str
+
+
+@dataclass
+class Firmware:
+    """
+    Represents a copy of the firmware that can be loaded/updated on the Charge Point.
+    FirmwareType is used by: SignedUpdateFirmware.req
+    """
+
+    location: str
+    retrieve_date_time: str
+    signing_certificate: str
+    install_date_time: Optional[str] = None
+    signature: Optional[str] = None
+
+
+@dataclass
+class LogParameters:
+    """
+    Class for detailed information the retrieval of logging entries.
+    LogParametersType is used by: GetLog.req
+    """
+
+    remote_location: str
+    oldest_timestamp: Optional[str] = None
+    latest_timestamp: Optional[str] = None