mgf-tele-core 0.1.3

Vendor-neutral telematics seam for mgf-common consumers — the TelematicsProvider device-session ABC, the codec-agnostic AVL frame types, the typed error hierarchy, and a scripted mock. Per-vendor codecs (mgf-tele-teltonika, …) build on this. Sibling of mgf-common under the mgf.* namespace.

mgf-tele-core

The vendor-neutral telematics seam for mgf-common consumers: the TelematicsProvider device-session ABC, the codec-agnostic AVL frame types, a typed error hierarchy, and a scripted mock. A sibling of mgf-common under the mgf.* namespace, and the foundation of the mgf-tele-* family — per-vendor codec packages (mgf-tele-teltonika, later mgf-tele-queclink, …) depend on this and never the other way.

Extracted from PlasmaMapper's ingest path (ADR-010's two-layer seam): the provider owns the device session; a per-vendor codec is a pure bytes → DecodedAvlRecord dependency injected into it.

Install

pip install mgf-tele-core

What's in it

Name	What
TelematicsProvider	the device-session ABC: open_session / receive_packet / send_command / close_session
SessionHandle / TrackerCommand / CommandAck	the seam's command/session vocabulary
GeoPoint / DecodedAvlRecord / ReceivedPacket / ParseStatus	codec-agnostic AVL frame types (every vendor normalises to these)
TelematicsError (+ MalformedPacketError, ChecksumError, UnsupportedCodecError, MalformedHandshakeError, UnknownTrackerError, SessionClosedError)	typed errors, all subclass mgf.common.exceptions.AppError
mgf.tele.core.mock.MockTelematicsProvider	scripted in-memory provider for consumers' tests

The two-layer shape

mgf-tele-core        TelematicsProvider (ABC)  +  AVL frame types  +  errors
      ▲
      │ depends on
mgf-tele-teltonika   Codec 8/8E/12 parser  +  TeltonikaProvider(codec)
mgf-tele-queclink    (future) …

A consumer wires a concrete provider into its ingest loop:

async def session_loop(provider: TelematicsProvider, reader, writer):
    handle = await provider.open_session(reader, writer)
    try:
        while True:
            packet = await provider.receive_packet(handle)   # ReceivedPacket
            persist_raw(packet)                               # always (forensic)
            if packet.parse_status == "ok":
                ingest(packet.records)                        # DecodedAvlRecord[]
    except SessionClosedError:
        pass
    finally:
        await provider.close_session(handle)

Tests use MockTelematicsProvider(batches=[…]) — no socket, no vendor codec — to drive the consumer's ingest logic deterministically.

Design notes

• Frozen frame types (rule DP-03); UTC at the boundary (DP-12).
• receive_packet always returns the raw bytes even on decode failure (parse_status ≠ "ok") so the consumer can persist a forensic record a future codec update may recover.
• Read-only consumers may have their provider raise NotImplementedError from send_command until a control plane lands.