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packet_spec.py
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packet_spec.py
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"""
packet_spec.py
This file contains dataclass definitions of the packet header and packets from the packet specification, and methods to parse
byte streams into their respective classes
"""
from dataclasses import dataclass
from abc import ABC
from enum import Enum
import numpy as np
import struct
class PacketType(Enum):
CONTROL = 0
TELEMETRY = 1
class TelemetryPacketSubType(Enum):
TEMPERATURE = 0
PRESSURE = 1
MASS = 2
ARMING_STATE = 3
ACT_STATE = 4
WARNING = 5
ACT_REQ = 6
ACT_ACK = 7
ARM_REQ = 8
ARM_ACK = 9
class ActuationRequestStatus(Enum):
ACT_OK = 0
ACT_DENIED = 1
ACT_DNE = 2
ACT_INV = 3
class ArmingState(Enum):
ARMED_PAD = 0
ARMED_VALVES = 1
ARMED_IGNITION = 2
ARMED_DISCONNECTED = 3
ARMED_LAUNCH = 4
class Warning(Enum):
HIGH_PRESSURE = 0
HIGH_TEMP = 1
class ActuatorState(Enum):
OFF = 0
ON = 1
class AcknowledgementStatus(Enum):
ARM_OK = 0
ARM_DENIED = 1
ARM_INV = 2
@dataclass
class PacketHeader:
type: PacketType
sub_type: TelemetryPacketSubType
@dataclass
class PacketMessage(ABC):
time_since_power: int
@dataclass
class ActuationRequest():
id: int
state: ActuatorState
@dataclass
class ActuationAcknowledgement():
id: int
status: ActuationRequestStatus
@dataclass
class ArmingRequest():
level: ArmingState
@dataclass
class ArmingAcknowledgement():
status: AcknowledgementStatus
@dataclass
class TemperaturePacket(PacketMessage):
temperature: int
id: int
@dataclass
class PressurePacket(PacketMessage):
pressure: int
id: int
@dataclass
class MassPacket(PacketMessage):
mass: int
id: int
@dataclass
class ArmingStatePacket(PacketMessage):
state: ArmingState
@dataclass
class ActuatorStatePacket(PacketMessage):
id: int
state: ActuatorState
@dataclass
class WarningPacket(PacketMessage):
type: Warning
def parse_packet_header(header_bytes: bytes) -> PacketHeader:
packet_type: int
packet_sub_type: int
packet_type, packet_sub_type = struct.unpack("<BB", header_bytes)
return PacketHeader(PacketType(packet_type), TelemetryPacketSubType(packet_sub_type))
def parse_packet_message(header: PacketHeader, message_bytes: bytes) -> PacketMessage:
match header.type:
case PacketType.CONTROL:
match header.sub_type:
case TelemetryPacketSubType.ACT_REQ:
id: int
state: int
id, state = struct.unpack("<BB". message_bytes)
return ActuationRequest(id=id, state=state)
case TelemetryPacketSubType.ACT_ACK:
id: int
status: int
id, status = struct.unpack("<BB", message_bytes)
return ActuationAcknowledgement(id=id, status=status)
case TelemetryPacketSubType.ARM_REQ:
level:int
level = struct.unpack("<B", message_bytes)
return ArmingRequest(level=level)
case TelemetryPacketSubType.ARM_ACK:
status:int
status = struct.unpack("<B", message_bytes)
return ArmingAcknowledgement(status=status)
case PacketType.TELEMETRY:
match header.sub_type:
case TelemetryPacketSubType.TEMPERATURE:
temperature: int
id: int
time: int
time, temperature, id = struct.unpack("<IIB", message_bytes)
return TemperaturePacket(temperature=temperature, id=id, time_since_power=time)
case TelemetryPacketSubType.PRESSURE:
pressure: int
id: int
time: int
time, pressure, id = struct.unpack("<IIB", message_bytes)
return PressurePacket(pressure=pressure, id=id, time_since_power=time)
case TelemetryPacketSubType.MASS:
time: int
mass: int
id: int
time, mass, id = struct.unpack("<IIB", message_bytes)
return MassPacket(mass=mass, id=id, time_since_power=time)
case TelemetryPacketSubType.ARMING_STATE:
time:int
state:int
time, state = struct.unpack("<IB", message_bytes)
return ArmingStatePacket(state=ArmingState(state), time_since_power=time)
case TelemetryPacketSubType.ACT_STATE:
time:int
state:int
id:int
time, id, state = struct.unpack("<IBB", message_bytes)
return ActuatorStatePacket(time_since_power=time, id=id, state=ActuatorState(state))
case TelemetryPacketSubType.WARNING:
time:int
type:int
time, type = struct.unpack("<IB", message_bytes)
return WarningPacket(type=Warning(type), time_since_power=time)