def __repr__(self):
if isinstance(self._data, C1218Request):
repr_data = repr(self._data)
else:
repr_data = '0x' + binascii.b2a_hex(self._data).decode('utf-8')
crc = binascii.b2a_hex(packet_checksum(self.start + self.identity + self.control + self.sequence + self._length + self._data)).decode('utf-8')
return '<C1218Packet data=' + repr_data + ' data_len=' + str(len(self._data)) + ' crc=0x' + crc + ' >'
def __repr__(self):
if isinstance(self._data, C1218Request):
repr_data = repr(self._data)
else:
repr_data = '0x' + binascii.b2a_hex(self._data).decode('utf-8')
crc = binascii.b2a_hex(packet_checksum(self.start + self.identity + self.control + self.sequence + self._length + self._data)).decode('utf-8')
return '<C1218Packet data=' + repr_data + ' data_len=' + str(len(self._data)) + ' crc=0x' + crc + ' >'
def build(self): packet = self.start packet += self.identity packet += self.control packet += self.sequence packet += self._length packet += self._data packet += packet_checksum(packet) return packet
def build(self):
packet = self.start
packet += self.identity
packet += self.control
packet += self.sequence
packet += self._length
packet += self._data
packet += packet_checksum(packet)
return packet
def from_bytes(cls, data):
if len(data) < 8:
raise Exception('invalid data (size)')
if data[0] != 0xee:
raise Exception('invalid start byte')
identity = data[1]
control = data[2]
sequence = data[3]
length = struct.unpack('>H', data[4:6])[0]
chksum = data[-2:]
if packet_checksum(data[:-2]) != chksum:
raise Exception('invalid check sum')
data = data[6:-2]
frame = C1218Packet(data, control, length)
frame.identity = struct.pack('B', identity)
frame.sequence = struct.pack('B', sequence)
return frame
def recv(self, full_frame=False):
"""
Receive a C1218Packet, the payload data is returned.
:param bool full_frame: If set to True, the entire C1218 frame is
returned instead of just the payload.
"""
payloadbuffer = b''
tries = 3
while tries:
tmpbuffer = self.serial_h.read(1)
if tmpbuffer != b'\xee':
self.loggerio.error(
'did not receive \\xee as the first byte of the frame')
self.loggerio.debug(
'received \\x' +
binascii.b2a_hex(tmpbuffer).decode('utf-8') + ' instead')
tries -= 1
continue
tmpbuffer += self.serial_h.read(5)
sequence, length = struct.unpack('>xxxBH', tmpbuffer)
payload = self.serial_h.read(length)
tmpbuffer += payload
chksum = self.serial_h.read(2)
if chksum == packet_checksum(tmpbuffer):
self.serial_h.write(ACK)
data = tmpbuffer + chksum
self.loggerio.debug(
"received frame, length: {0:<3} data: {1}".format(
len(data),
binascii.b2a_hex(data).decode('utf-8')))
payloadbuffer += payload
if sequence == 0:
if full_frame:
payloadbuffer = data
if sys.version_info[0] == 2:
payloadbuffer = bytearray(payloadbuffer)
return payloadbuffer
else:
tries = 3
else:
self.serial_h.write(NACK)
self.loggerio.warning('crc does not match on received frame')
tries -= 1
self.loggerio.critical('failed 3 times to correctly receive a frame')
raise C1218IOError('failed 3 times to correctly receive a frame')
def from_bytes(cls, data):
if len(data) < 8:
raise Exception('invalid data (size)')
if data[0] != 0xee:
raise Exception('invalid start byte')
identity = data[1]
control = data[2]
sequence = data[3]
length = struct.unpack('>H', data[4:6])[0]
chksum = data[-2:]
if packet_checksum(data[:-2]) != chksum:
raise Exception('invalid check sum')
data = data[6:-2]
frame = C1218Packet(data, control, length)
frame.identity = struct.pack('B', identity)
frame.sequence = struct.pack('B', sequence)
return frame
def parse(data):
if len(data) < 8:
raise Exception('invalid data (size)')
if data[0] != b'\xee':
raise Exception('invalid start byte')
identity = data[1]
control = ord(data[2])
sequence = data[3]
length = struct.unpack('>H', data[4:6])[0]
chksum = data[-2:]
if packet_checksum(data[:-2]) != chksum:
raise Exception('invalid check sum')
data = data[6:-2]
if ord(data[0]) in C1218_REQUEST_IDS:
data = C1218_REQUEST_IDS[ord(data[0])].parse(data)
frame = C1218Packet(data, control, length)
frame.identity = identity
frame.sequence = sequence
return frame
def recv(self, full_frame=False):
"""
Receive a C1218Packet, the payload data is returned.
:param bool full_frame: If set to True, the entire C1218 frame is
returned instead of just the payload.
"""
payloadbuffer = b''
tries = 3
while tries:
tmpbuffer = self.serial_h.read(1)
if tmpbuffer != b'\xee':
self.loggerio.error('did not receive \\xee as the first byte of the frame')
self.loggerio.debug('received \\x' + binascii.b2a_hex(tmpbuffer).decode('utf-8') + ' instead')
tries -= 1
continue
tmpbuffer += self.serial_h.read(5)
sequence, length = struct.unpack('>xxxBH', tmpbuffer)
payload = self.serial_h.read(length)
tmpbuffer += payload
chksum = self.serial_h.read(2)
if chksum == packet_checksum(tmpbuffer):
self.serial_h.write(ACK)
data = tmpbuffer + chksum
self.loggerio.debug("received frame, length: {0:<3} data: {1}".format(len(data), binascii.b2a_hex(data).decode('utf-8')))
payloadbuffer += payload
if sequence == 0:
if full_frame:
payloadbuffer = data
if sys.version_info[0] == 2:
payloadbuffer = bytearray(payloadbuffer)
return payloadbuffer
else:
tries = 3
else:
self.serial_h.write(NACK)
self.loggerio.warning('crc does not match on received frame')
tries -= 1
self.loggerio.critical('failed 3 times to correctly receive a frame')
raise C1218IOError('failed 3 times to correctly receive a frame')
def recv2(self, full_frame=False):
"""
Receive a C1218Packet, the payload data is returned.
:param bool full_frame: If set to True, the entire C1218 frame is
returned instead of just the payload.
"""
payloadbuffer = b''
tries = 3
while tries:
tmpbuffer = self.serial_h.read(1)
#Debug Code - checked
#print("connection.py - 100: {} and {}".format("tmpbuffer.read(1):",tmpbuffer))
if tmpbuffer != b'\xee':
#Debug Code - skipped
#print("Inside tmpbuffer != b... ")
self.loggerio.error('did not receive \\xee as the first byte of the frame')
self.loggerio.debug('received \\x' + binascii.b2a_hex(tmpbuffer).decode('utf-8') + ' instead')
tries -= 1
continue
tmpbuffer += b'\xee'
tmpbuffer += self.serial_h.read(4)
#Debug code
#print("{} and {}".format("tmpbuffer += self.serial_h.read(4)",tmpbuffer))
sequence, length = struct.unpack('>xxxBH', tmpbuffer)
#Debug code
#print("conenction.py - 282: sequence: {} and Length {}".format(sequence,length))
payload = self.serial_h.read(length)
#Debug code
#print("connection.py - 199: Payload: {}".format(payload))
tmpbuffer += payload
#Debug code
#print("196: tmpbuffer: {}".format(tmpbuffer))
chksum = self.serial_h.read(2)
#Debug code
#print("chksum: {}".format(chksum))
if chksum == packet_checksum(tmpbuffer):
#Debug code
#print("chksum: {} and packet_checksum(tmpbuffer): {}".format(chksum,packet_checksum(tmpbuffer)))
#Debug code
#print("ACK: {}".format(ACK))
self.serial_h.write(ACK)
#Debug code
#print("tmpbuffer: {} and chksum {}".format(tmpbuffer,chksum))
data = tmpbuffer + chksum
#Debug code
#print("210: data: {}".format(data))
self.loggerio.debug("received frame, length: {0:<3} data: {1}".format(len(data), binascii.b2a_hex(data).decode('utf-8')))
payloadbuffer += payload
#Debug code
#print("connection.py- 218 payloadbuffer: {}".format(payloadbuffer))
if sequence == 0:
#Debug code
#print("217: sequence {} and full_frame {}".format(sequence,full_frame))
if full_frame:
#Debug code
#print("220: Inside <if> full_frame: {}".format(full_frame))
payloadbuffer = data
#Debug code
#print("223: sys.version_info[0]: {}".format(sys.version_info[0]))
if sys.version_info[0] == 2:
#Debug code
#print("226: Inside <if> sys.version_info[0]: {}".format(sys.version_info[0]))
payloadbuffer = bytearray(payloadbuffer)
#Debug code
#print("229: Before return payloadbuffer: {}".format(payloadbuffer))
return payloadbuffer
#Debug code
#print("232:After return payloadbuffer: {}".format(payloadbuffer))
else:
#Debug Code
#print("Inside Else")
tries = 3
else:
#Debug Code
#print("Inside Else")
self.serial_h.write(NACK)
self.loggerio.warning('crc does not match on received frame')
tries -= 1
#Debug Code
#print("Does it fail?")
self.loggerio.critical('failed 3 times to correctly receive a frame')
raise C1218IOError('failed 3 times to correctly receive a frame')
