def from_payload(cls, payload): """ Creates a ``Request`` object from a payload coming from the underlying protocols. This method is meant to be used by a UDS server :param payload: The payload of data to parse :type payload: bytes :return: A :ref:`Request<Request>` object with populated fields :rtype: :ref:`Request<Request>` """ req = cls() if len(payload) >= 1: req.service = services.cls_from_request_id(payload[0]) if req.service is not None: # Invalid service ID will make service None offset = 0 if req.service.use_subfunction(): offset += 1 if len(payload) >= offset+1: req.subfunction = int(payload[1]) & 0x7F req.suppress_positive_response = True if payload[1] & 0x80 > 0 else False if len(payload) > offset+1: req.data = payload[offset+1:] return req
def from_payload(cls, payload):
from udsoncan import services
response = cls()
response.original_payload = payload # may be useful for debugging
if len(payload) < 1:
response.valid = False
response.invalid_reason = "Payload is empty"
return response
if payload[0] != 0x7F: # Positive
response.service = services.cls_from_response_id(payload[0])
if response.service is None:
response.valid = False
response.invalid_reason = "Payload first byte is not a know service response ID."
return response
data_start = 1
response.positive = True
if len(payload) < 2 and response.service.has_response_data():
response.valid = False
response.positive = False
response.invalid_reason = "Payload must be at least 2 bytes long (service and response)"
return response
response.code = Response.Code.PositiveResponse
response.code_name = Response.Code.get_name(
Response.Code.PositiveResponse)
else: # Negative response
response.positive = False
data_start = 3
if len(payload) < 2:
response.valid = False
response.invalid_reason = "Incomplete invalid response service (7Fxx)"
return response
response.service = services.cls_from_request_id(
payload[1]) #Request id, not response id
if response.service is None:
response.valid = False
response.invalid_reason = "Payload second byte is not a known service request ID."
return response
if len(payload) < 3:
response.valid = False
response.invalid_reason = "Response code missing"
return response
response.code = int(payload[2])
response.code_name = Response.Code.get_name(response.code)
response.valid = True
if len(payload) > data_start:
response.data = payload[data_start:]
return response
def from_payload(cls, payload): req = cls() if len(payload) >= 1: req.service = services.cls_from_request_id(payload[0]) if req.service is not None: # Invalid service ID will make service None offset = 0 if req.service.use_subfunction(): offset += 1 if len(payload) >= offset+1: req.subfunction = int(payload[1]) & 0x7F req.suppress_positive_response = True if payload[1] & 0x80 > 0 else False if len(payload) > offset+1: req.data = payload[offset+1:] return req
def from_payload(cls, payload):
u"""
Creates a ``Response`` object from a payload coming from the underlying protocol.
This method is meant to be used by a UDS client
:param payload: The payload of data to parse
:type payload: bytes
:return: A :ref:`Response<Response>` object with populated fields
:rtype: :ref:`Response<Response>`
"""
from udsoncan import services
response = cls()
response.original_payload = payload # may be useful for debugging
if len(payload) < 1:
response.valid = False
response.invalid_reason = u"Payload is empty"
return response
if ord(payload[0]) != 0x7F: # Positive
response.service = services.cls_from_response_id(ord(payload[0]))
if response.service is None:
response.valid = False
response.invalid_reason = u"Payload first byte is not a know service response ID."
return response
data_start = 1
response.positive = True
if len(payload) < 2 and response.service.has_response_data():
response.valid = False
response.positive = False
response.invalid_reason = u"Payload must be at least 2 bytes long (service and response)"
return response
response.code = Response.Code.PositiveResponse
response.code_name = Response.Code.get_name(
Response.Code.PositiveResponse)
else: # Negative response
response.positive = False
data_start = 3
if len(payload) < 2:
response.valid = False
response.invalid_reason = u"Incomplete invalid response service (7Fxx)"
return response
response.service = services.cls_from_request_id(ord(
payload[1])) #Request id, not response id
if response.service is None:
response.valid = False
response.invalid_reason = u"Payload second byte is not a known service request ID."
return response
if len(payload) < 3:
response.valid = False
response.invalid_reason = u"Response code missing"
return response
response.code = ord(payload[2])
response.code_name = Response.Code.get_name(response.code)
response.valid = True
response.invalid_reason = u""
if len(payload) > data_start:
response.data = payload[data_start:]
return response