def read_message(self, verbose=False):
"""Read new message
:param bool verbose: Log every dlt_message_read(). Set True only for debugging.
:returns: A new DLTMessage on successful read, None otherwise
:rtype: DLTMessage|None
"""
msg = DLTMessage(verbose=verbose)
res = dltlib.dlt_message_read(
ctypes.byref(msg),
ctypes.cast(self.receiver.buf, ctypes.POINTER(ctypes.c_uint8)),
ctypes.c_uint(self.receiver.bytesRcvd), # length
ctypes.c_int(0), # resync
ctypes.c_int(verbose)) # verbose
if res != DLT_MESSAGE_ERROR_OK:
# - failed to read a complete message, possibly read an incomplete
# message
return None
# prepare storage header
if msg.standardheader.htyp & DLT_HTYP_WEID:
dltlib.dlt_set_storageheader(msg.p_storageheader,
msg.headerextra.ecu)
else:
dltlib.dlt_set_storageheader(msg.p_storageheader,
ctypes.c_char_p(""))
return msg
def msg_callback(msg, data):
if msg == None:
print("NULL message in callback")
return -1
if msg.contents.p_standardheader.contents.htyp & DLT_HTYP_WEID:
dltlib.dlt_set_storageheader(msg.contents.p_storageheader,
msg.contents.headerextra.ecu)
else:
dltlib.dlt_set_storageheader(msg.contents.p_storageheader,
ctypes.c_char_p(""))
print(msg.contents)
return 0
def msg_callback(msg, data): # pylint: disable=no-self-argument
"""Implements a simple callback that prints a dlt message received"""
if msg is None:
print("NULL message in callback")
return -1
if msg.contents.p_standardheader.contents.htyp & DLT_HTYP_WEID:
dltlib.dlt_set_storageheader(msg.contents.p_storageheader,
msg.contents.headerextra.ecu)
else:
dltlib.dlt_set_storageheader(msg.contents.p_storageheader,
ctypes.c_char_p(""))
print(msg.contents)
return 0