minsp.pus module

The minsp.pus module provides PUS header related classes.

class minsp.pus.PUSHeader(version: int = 1, ack: int = 0, service_type: int = 1, service_subtype: int = 1, source_id: int = 0, has_time: bool = False, cuc_time: bytes = b'')

Bases: object

Represents a Packet Utilization Standard (PUS) secondary header as used in CCSDS space packets.

The PUS secondary header adds standardized metadata to a CCSDS space packet, including service type, service subtype, source ID, and an optional timestamp in CUC format.

Parameters:

• version (int) – PUS version number (4 bits).

• ack (int) – Acknowledgment flags, only for telecommands (4 bits).

• service_type (int) – PUS service type (1 byte).

• service_subtype (int) – PUS service subtype (1 byte).

• source_id (int) – Identifier of the source application or subsystem (1 byte).

• has_time (bool) – Sequence count, default is 0 (14 bits).

• cuc_time – Optional CUC-formatted timestamp (7 bytes).

• cuc_time – bytes.

ack: int = 0

as_bytes() → bytes

Packs the PUS header as a byte stream.

Returns:

PUS header bytes.

Return type:

bytes

cuc_time: bytes = b''

classmethod from_bytes(data: bytes, has_time: bool = False) → PUSHeader

Unpacks a byte stream into a PUSHeader instance.

Parameters:

• data (bytes) – The byte stream.

• has_time (bool) – Includes a CUC time in header.

Raises:

• ValueError – Insufficient data for PUS header.

• ValueError – Insufficient data for PUS header with CUC time.

Returns:

A new PUSHeader.

Return type:

PUSHeader

has_time: bool = False

service_subtype: int = 1

service_type: int = 1

source_id: int = 0

version: int = 1