cls,
name + ".In",
(newcls,) + bases,
- {"KWARGS": newcls.IN_KWARGS, "encode": newcls.in_encode},
+ {
+ "KWARGS": newcls.IN_KWARGS,
+ "decode": newcls.in_decode,
+ "encode": newcls.in_encode,
+ },
)
newcls.Out = super().__new__(
cls,
name + ".Out",
(newcls,) + bases,
- {"KWARGS": newcls.OUT_KWARGS, "encode": newcls.out_encode},
+ {
+ "KWARGS": newcls.OUT_KWARGS,
+ "decode": newcls.out_decode,
+ "encode": newcls.out_encode,
+ },
)
return newcls
class GPS303Pkt(metaclass=MetaPkt):
RESPOND = Respond.NON # Do not send anything back by default
PROTO: int
- # Have these kwargs for now, TODO redo
- IN_KWARGS = (("length", int, 0), ("payload", bytes, b""))
+ IN_KWARGS = ()
OUT_KWARGS = ()
def __init__(self, *args, **kwargs):
- assert len(args) == 0
- for kw, typ, dfl in self.KWARGS:
- setattr(self, kw, typ(kwargs.pop(kw, dfl)))
- if kwargs:
- print("KWARGS", self.KWARGS)
- print("kwargs", kwargs)
- raise TypeError(
- self.__class__.__name__ + " stray kwargs " + str(kwargs)
- )
+ """
+ Construct the object _either_ from (length, payload),
+ _or_ from the values of individual fields
+ """
+ assert not args or (len(args) == 2 and not kwargs)
+ if args: # guaranteed to be two arguments at this point
+ self.length, self.payload = args
+ self.decode(self.length, self.payload)
+ else:
+ for kw, typ, dfl in self.KWARGS:
+ setattr(self, kw, typ(kwargs.pop(kw, dfl)))
+ if kwargs:
+ raise ValueError(
+ self.__class__.__name__ + " stray kwargs " + str(kwargs)
+ )
def __repr__(self):
return "{}({})".format(
),
)
+ def in_decode(self, length, packet):
+ # Overridden in subclasses, otherwise do not decode payload
+ return
+
+ def out_decode(self, length, packet):
+ # Necessary to emulate terminal, which is not implemented
+ raise NotImplementedError(
+ self.__class__.__name__ + ".decode() not implemented"
+ )
+
def in_encode(self):
+ # Necessary to emulate terminal, which is not implemented
raise NotImplementedError(
self.__class__.__name__ + ".encode() not implemented"
)
def out_encode(self):
+ # Overridden in subclasses, otherwise make empty payload
return b""
@property
length = len(payload) + 1
return pack("BB", length, self.PROTO) + payload
- @classmethod
- def from_packet(cls, length, payload):
- return cls.In(payload=payload, length=length)
-
class UNKNOWN(GPS303Pkt):
PROTO = 256 # > 255 is impossible in real packets
RESPOND = Respond.INL
# Default response for ACK, can also respond with STOP_UPLOAD
- @classmethod
- def from_packet(cls, length, payload):
- self = super().from_packet(length, payload)
+ def in_decode(self, length, payload):
self.imei = payload[:-1].hex()
self.ver = unpack("B", payload[-1:])[0]
return self
class _GPS_POSITIONING(GPS303Pkt):
RESPOND = Respond.INL
- @classmethod
- def from_packet(cls, length, payload):
- self = super().from_packet(length, payload)
+ def in_decode(self, length, payload):
self.dtime = payload[:6]
if self.dtime == b"\0\0\0\0\0\0":
self.devtime = None
else:
+ yr, mo, da, hr, mi, se = unpack("BBBBBB", self.dtime)
self.devtime = datetime(
- *unpack("BBBBBB", self.dtime), tzinfo=timezone.utc
+ 2000 + yr, mo, da, hr, mi, se, tzinfo=timezone.utc
)
self.gps_data_length = payload[6] >> 4
self.gps_nb_sat = payload[6] & 0x0F
flip_lat = not bool(flags & 0b0000010000000000) # bit 5
self.heading = flags & 0b0000001111111111 # bits 6 - last
self.latitude = lat / (30000 * 60) * (-1 if flip_lat else 1)
- self.longitude = lon / (30000 * 60) * (-2 if flip_lon else 1)
+ self.longitude = lon / (30000 * 60) * (-1 if flip_lon else 1)
self.speed = speed
self.flags = flags
return self
RESPOND = Respond.EXT
OUT_KWARGS = (("upload_interval", int, 25),)
- @classmethod
- def from_packet(cls, length, payload):
- self = super().from_packet(length, payload)
- if len(payload) == 5:
- (
- self.batt,
- self.ver,
- self.timezone,
- self.intvl,
- self.signal,
- ) = unpack("BBBBB", payload)
- elif len(payload) == 4:
- self.batt, self.ver, self.timezone, self.intvl = unpack(
- "BBBB", payload
- )
+ def in_decode(self, length, payload):
+ self.batt, self.ver, self.timezone, self.intvl = unpack(
+ "BBBB", payload[:4]
+ )
+ if len(payload) > 4:
+ self.signal = payload[4]
+ else:
self.signal = None
return self
class _WIFI_POSITIONING(GPS303Pkt):
- @classmethod
- def from_packet(cls, length, payload):
- self = super().from_packet(length, payload)
+ def in_decode(self, length, payload):
self.dtime = payload[:6]
if self.dtime == b"\0\0\0\0\0\0":
self.devtime = None
class STOP_ALARM(GPS303Pkt):
PROTO = 0x56
- @classmethod
- def from_packet(cls, length, payload):
- self = super().from_packet(length, payload)
+ def in_decode(self, length, payload):
self.flag = payload[0]
return self
class MANUAL_POSITIONING(GPS303Pkt):
PROTO = 0x80
- @classmethod
- def from_packet(cls, length, payload):
- self = super().from_packet(length, payload)
+ def in_decode(self, length, payload):
self.flag = payload[0] if len(payload) > 0 else None
self.reason = {
1: "Incorrect time",
RESPOND = Respond.EXT
OUT_KWARGS = (("interval", int, 10),)
- @classmethod
- def from_packet(cls, length, payload):
- self = super().from_packet(length, payload)
+ def in_decode(self, length, payload):
self.interval = unpack("!H", payload[:2])
return self
class UNKNOWN_B3(GPS303Pkt):
- PROTO = 0xb3
+ PROTO = 0xB3
IN_KWARGS = (("asciidata", str, ""),)
- @classmethod
- def from_packet(cls, length, payload):
- self = super().from_packet(length, payload)
+ def in_decode(self, length, payload):
self.asciidata = payload.decode()
return self
def parse_message(packet):
- """ From a packet (without framing bytes) derive the XXX.In object """
+ """From a packet (without framing bytes) derive the XXX.In object"""
length, proto = unpack("BB", packet[:2])
payload = packet[2:]
if proto in CLASSES:
- return CLASSES[proto].from_packet(length, payload)
+ return CLASSES[proto].In(length, payload)
else:
- retobj = UNKNOWN.from_packet(length, payload)
+ retobj = UNKNOWN.In(length, payload)
retobj.PROTO = proto # Override class attr with object attr
return retobj
projects / loctrkd.git / blobdiff