def get_pid(pid='00'):
try:
self._process_pid(mode, pid)
except Exception as err:
# logging
logger.error(err)
return self
def connection(self, port, baudrate=DEFAULT_BAUDRATE):
try:
self.bus = uart_base(port, baudrate)
self._mapping()
except Exception as err:
# logging exception
logger.error(err)
return None
return self
def get_data(self, record):
record = record[6:self.check_sum]
if len(record) >= 6 and len(record) <= 16:
# remove first 4 characters. This are service bytes from ELM
# format mode:pid:data
# ex: 4100FFFFFFFF - ELM spec page 38
record = record[4:]
else:
mess = "The frame size is not suitable."
logger.error(mess)
raise Exception(mess)
return record
def receive(self):
"""
Receive data from connected OBD-II Scanner
:return: the data returned by the OBD-II Scanner
"""
if self.is_port():
value = self.collect_data()
if value:
return Response(value, self.get_proto_num())
else:
mess = "Cannot read when unconnected"
logger.error(mess)
raise Exception(mess)
return Response()
def check_error(cls, data):
"""
Checks the error data. The data starts with 7F
format: 7F mode code
"""
response = True
codes = {
10: 'general reject',
11: 'service not supported',
12: 'invalid format',
21: 'busy',
22: 'conditions not correct',
78: 'pending replies'
}
if data[0][0:2] == '7F':
# logging error
logger.error('Error: mode {} - {}'.format(data[0][2:4], # mode
codes.get(int(data[0][-2:]))) # code
)
response = False
return response
def check_echo_off(self):
if not self._check_response(self.echo_off()):
mess = "Echo command did not completed"
logger.error(mess)
raise Exception(mess)
def set_protocol(self):
if not self._check_response(
self.send(elm327.SET_PROTOCOL_AUTO_COMMAND).raw_value):
mess = "Set protocol command did not completed"
logger.error(mess)
raise Exception(mess)
def header_on(self):
if not self._check_response(
self.send(elm327.HEADER_ON_COMMAND).raw_value):
mess = "Enable header command did not completed"
logger.error(mess)
raise Exception(mess)
def check_connection(self):
if not self.__connected:
mess = "Failed connection to the OBD2 interface!"
logger.error(mess)
raise Exception(mess)
