nobro-rtos 0.3.1

Host-side NobroRTOS contract builders and inspection helpers.

NobroRTOS Python Tooling

This folder contains Python-facing host tooling and contract builders. The Python layer is for development workflows, not hard-realtime firmware paths.

Install the dependency-free core from PyPI with pip install nobro_rtos. Use pip install "nobro_rtos[serial]" for live serial ports or pip install "nobro_rtos[tflite]" for the large TensorFlow-based .tflite importer. Python normalizes _ and -, so the install command resolves the nobro-rtos distribution and the import remains nobro_rtos.

Author one graph for pytest and native firmware

NobroApp uses one small declaration for deterministic host callbacks and for strict JSON consumed by nobro firmware:

from nobro_rtos import HZ, NobroApp

seen = []
app = (NobroApp("rover", board="nrf52840-nosd")
       .task("motor", HZ(200), lambda event: seen.append(event.now_us),
             role="control")
       .task("imu", HZ(100))
       .wire("imu", "motor", 8))

report = app.run(50_000)
app.write_json("app.json")
assert report.runs["motor"] == 10

python sdk/cli/nobro.py firmware app.json --build

The callable is deliberately omitted from JSON: it is a host-only pytest hook, not on-device Python. The firmware CLI validates data and never evaluates the authoring script. The generated image is native Rust admitted by the existing firmware path. Wire capacity is retained as graph metadata; it is not yet a Python payload channel.

Initial priorities:

• report decoding
• board/package fixture inspection
• manifest and adapter compatibility checks
• simulation harnesses for sensor and actuator fixtures
• AI/control orchestration hooks outside firmware hot paths
• VS Code task integration
• project template generation
• MicroPython, CircuitPython, and mPython-inspired bridge workflows

Contract Builders

nobro_rtos.contracts provides small typed builders for:

• module specs
• memory budgets
• startup dependencies and startup plans
• AI model contracts
• ROS-style bridge descriptors

Example:

from nobro_rtos import (
    AiBackendKind,
    AiModelContract,
    Capability,
    Criticality,
    MemoryBudget,
    ModuleSpec,
    NobroContractBundle,
)

bundle = NobroContractBundle(
    modules=(
        ModuleSpec(
            "ai",
            Criticality.USER,
            MemoryBudget(16 * 1024, 6 * 1024, 1),
            requires=(Capability.AI_INFERENCE, Capability.AI_ENDPOINT),
            owns=(Capability.AI_INFERENCE, Capability.AI_ENDPOINT),
        ),
    ),
    ai_models=(
        AiModelContract(
            model_id=42,
            backend=AiBackendKind.ON_DEVICE,
            input_bytes_max=128,
            output_bytes_max=32,
            arena_bytes=4096,
            timeout_us=20_000,
            stale_after_us=100_000,
        ),
    ),
)

print(bundle.to_json())

These builders keep Python-first users on the same contracts as the Rust core: fixed budgets, explicit capabilities, bounded AI inference, and bounded robotics bridge metadata. Bundle validation also checks capability ownership: kernel-owned capabilities are treated as implicit providers, while non-kernel capabilities must have exactly one owning module before another module can require them. StartupDependency and plan_startup mirror the Rust startup graph for host-side ordering checks. They keep dependencies explicit, reject unknown modules and cycles, and produce a deterministic order suitable for generated project checks and CI. The check-bundle-matrix CLI validates bundle roundtrip, capability ownership, module naming, AI/ROS uniqueness, hard-realtime deadline, and startup dependency error paths.

AiRoutePolicy mirrors the Rust/C route decision contract for host simulation and VS Code workflows. It can choose local inference, a remote endpoint, stale snapshot reuse, degraded fallback, or an unavailable state from the same budget and circuit-breaker inputs used by firmware. A zero policy stale window inherits the model contract's stale_after_us; otherwise the stricter window is used. AiInvocationConstraints and preflight_ai_invocation add a host-side admission check before inference. They validate input/output buffers, scratch and arena RAM, non-zero local arena declarations, budget, declared AI capabilities, stale snapshots, degraded fallback, and endpoint circuit policy without contacting a model or cloud API.

ROS-style bridge descriptors keep readable names and also emit stable FNV-1a 32-bit hashes (name_hash, message_type_hash, bridge_id_hash, and transport_hash). Rust-side RosBridgeContract code can use those hash fields without carrying dynamic strings in realtime paths.

Project Templates

build_project_template creates starter project manifests in memory for standalone SDK, Arduino, PlatformIO, Python host, and Python board bridge workflows. The sample-project CLI prints the file list and contents as JSON, so callers can inspect or filter the template first. The write-project CLI materializes the same template with path-escape checks and no overwrite unless --overwrite is set. The check-project CLI validates a generated project directory by detecting its target shape, loading nobro-contract.json, and checking the generated VS Code task metadata for the expected target. It returns a non-zero process status when validation fails, so generated tasks and CI jobs can use it as a real gate. The repair-project CLI conservatively rebuilds .vscode/tasks.json when that metadata is missing or stale; it does not rewrite user code or contracts. The check-starter-templates CLI materializes every starter target in a temporary directory, validates it, and removes the generated files when the gate exits. Generated templates include .vscode/tasks.json with a project check task; the Python host template also includes runtime drill, runtime drill gate, and AI route, AI route matrix, AI preflight matrix, ROS preflight matrix, recovery matrix, watchdog matrix, scheduler matrix, event log matrix, quota matrix, degrade matrix, startup matrix, boot summary matrix, bundle matrix, and report matrix gate tasks. The Python board bridge template includes an offline bridge smoke task for MicroPython, CircuitPython, and mPython-style status-line workflows. Project validation checks both task labels and the expected task command arguments, so stale editor metadata cannot silently point to the wrong host tool.

from nobro_rtos import ProjectTarget, build_project_template

template = build_project_template(
    name="edge_demo",
    target=ProjectTarget.PLATFORMIO,
    module_name="control",
)
assert "nobro-contract.json" in template.file_map()

Simulation Helpers

SensorStubSimulator mirrors the Rust sensor-stub fixture modes for host workflows. ServoSimulator mirrors the RoboServo-style actuator timing and readback checks. WatchdogSimulator mirrors the kernel heartbeat tracker. SchedulerSimulator mirrors the kernel deadline tick counters. The check-scheduler-matrix CLI validates on-time ticks, early/late jitter within tolerance, missed deadlines, 32-bit time wraparound, counter reset, and invalid scheduler configuration. EventLogSimulator mirrors the fixed-ring event log. The check-event-log-matrix CLI validates capacity accounting, overwrite pressure, recent-record order, severity thresholds, zero-capacity behavior, and invalid input handling. QuotaLedgerSimulator mirrors fixed-capacity quota accounting. The check-quota-matrix CLI validates registration capacity, reserve/release totals, strict module identity, limit enforcement, release underflow, configuration errors, and arithmetic overflow. DegradePlannerSimulator mirrors degraded-mode module fitting. The check-degrade-matrix CLI validates flash, RAM, pool, module-limit, same-criticality, capacity, and essential-module pressure paths. The check-startup-matrix CLI validates no-dependency, dependency-chain, fan-in/fan-out, dependency-impact, unknown-node, self-cycle, duplicate-edge, and cycle paths for the deterministic startup planner. The check-boot-summary-matrix CLI validates all-pass, missing-stage, corrupt-checksum, failed-adapter, in-progress-stage, diagnostic-code, and status-count paths for boot report summaries. The check-report-matrix CLI validates fixed report pass, fail, missing, in-progress, corrupt, checksum, error-label, AI model, and ROS bridge decode paths. RuntimeDrillSimulator composes planning, quota, event-log, and recovery checks into one deterministic pressure drill. RecoveryPolicySimulator mirrors the kernel's health threshold escalation for host-side self-healing drills. RecoveryPlan and RecoveryPlanExecution mirror the kernel's fixed-capacity recovery planner and dispatch cursor for host-side restart, retry, and heartbeat-verification checks, including dependent-module quiesce and resume ordering for reboot plans built from startup impact data. RecoveryRuntimeSimulator applies dispatched recovery steps to host-side module state so notebooks, tests, and editor tasks can rehearse quiesce/resume bookkeeping without pretending to restart hardware. RecoverySummary turns drill recovery decisions into stable action counts, final state, and reboot requirement flags for CI gates and editor views.

from nobro_rtos import (
    EventLogSimulator,
    DegradePlannerSimulator,
    QuotaLedgerSimulator,
    RecoveryPlan,
    RecoveryPlanExecution,
    RecoveryPolicySimulator,
    RecoveryRuntimeSimulator,
    ResourceBudget,
    RuntimeDrillSimulator,
    SchedulerSimulator,
    SensorStubSimulator,
    ServoSimulator,
    SystemProfile,
    WatchdogSimulator,
)

sim = SensorStubSimulator.bad_data_every(2, sample_period_ticks=1)
first = sim.poll()
second = sim.poll()

assert first.plausible
assert not second.plausible

servo = ServoSimulator(readback_offset_us=10)
command = servo.set_duty_us(0, 1500, deadline_us=100, issued_at_us=90)
assert command.accepted

recovery = RecoveryPolicySimulator(notify_after=2, reboot_after=3)
recovery.record_error("bus", "bus_timeout", 10)
recovery.record_error("bus", "bus_timeout", 20)
decision = recovery.record_error("bus", "bus_timeout", 30)
plan = RecoveryPlan.from_decision(
    decision,
    affected_modules=("app", "sensor"),
    max_steps=8,
)
execution = RecoveryPlanExecution(plan)
dispatch = execution.dispatch_due(plan.deadline_us + 100, capacity=1)
assert dispatch.dispatched == 1
runtime = RecoveryRuntimeSimulator.from_modules(["bus", "sensor", "app"])
runtime.mark_recovering("bus")
for step in plan.steps:
    runtime.apply_recovery_step(step)
assert runtime.to_dict()["app"] == "active"

watchdog = WatchdogSimulator(capacity=1)
watchdog.register("sensor", timeout_us=100, now_us=0)
assert watchdog.expired_count(150) == 1
assert watchdog.expired(150)[0].module == "sensor"

scheduler = SchedulerSimulator(jitter_tolerance_us=25)
for tick in (1000, 21020, 41050):
    scheduler.on_deadline_tick(tick)
assert scheduler.stats().deadline_misses == 1

events = EventLogSimulator(capacity=3)
for index in range(4):
    events.push(index * 10, "kernel", "warn", "host", "counter", index)
assert events.dropped == 1

quota = QuotaLedgerSimulator(capacity=1)
quota.register("sensor", ResourceBudget(1024, 256, 1))
quota.reserve("sensor", ResourceBudget(512, 128, 1))
assert quota.available("sensor").flash_bytes == 512

decision = DegradePlannerSimulator.fit(
    modules=(),
    profile=SystemProfile(64 * 1024, 16 * 1024, 8, 4),
)
assert decision.disabled_count == 0

drill = RuntimeDrillSimulator(
    modules=(),
    profile=SystemProfile(64 * 1024, 16 * 1024, 8, 4),
)
assert drill.run().decision.disabled_count == 0

The simulator is deterministic and uses only caller-visible records, making it suitable for VS Code tasks, notebook experiments, and CI checks that should not touch a board.

CLI

Run the module from this folder or after installing the package:

python -m nobro_rtos doctor
python -m nobro_rtos sample-ai-ros
python -m nobro_rtos sample-ai-route
python -m nobro_rtos check-ai-route --backend hybrid --require-target on_device
python -m nobro_rtos check-ai-route-matrix
python -m nobro_rtos sample-ai-preflight
python -m nobro_rtos check-ai-preflight-matrix
python -m nobro_rtos sample-ros-preflight
python -m nobro_rtos check-ros-preflight-matrix
python -m nobro_rtos check-bundle-matrix
python -m nobro_rtos check-report-matrix
python -m nobro_rtos sample-report runtime
python -m nobro_rtos sample-report health
python -m nobro_rtos sample-report ai_model
python -m nobro_rtos sample-report ros_bridge
python -m nobro_rtos sample-sensor --mode bad_data_every --ticks 4 --period 1
python -m nobro_rtos sample-actuator --start-us 1200 --stop-us 1800 --step-us 300
python -m nobro_rtos sample-recovery --error sensor_read_fail --events 4
python -m nobro_rtos check-recovery-matrix
python -m nobro_rtos sample-watchdog --timeout-us 100 --sweeps 3 --step-us 75
python -m nobro_rtos check-watchdog-matrix
python -m nobro_rtos sample-scheduler --ticks 1000 21020 41050 --tolerance-us 25
python -m nobro_rtos check-scheduler-matrix
python -m nobro_rtos sample-event-log --capacity 3 --events 4 --recent 3
python -m nobro_rtos check-event-log-matrix
python -m nobro_rtos sample-quota
python -m nobro_rtos check-quota-matrix
python -m nobro_rtos sample-degrade --flash-limit 73728 --ram-limit 16384
python -m nobro_rtos check-degrade-matrix
python -m nobro_rtos sample-runtime-drill --fault-count 3
python -m nobro_rtos check-runtime-drill --fault-count 3
python -m nobro_rtos check-software-surface
python -m nobro_rtos check-python-surface
python -m nobro_rtos check-cli-command-surface
python -m nobro_rtos check-starter-templates
python -m nobro_rtos sample-startup
python -m nobro_rtos check-startup-matrix
python -m nobro_rtos check-boot-summary-matrix
python -m nobro_rtos check-report-matrix
python -m nobro_rtos sample-project platformio --name edge_demo --module control
python -m nobro_rtos write-project platformio --output _work\edge_demo --name edge_demo
python -m nobro_rtos check-project _work\edge_demo --target platformio
python -m nobro_rtos repair-project _work\edge_demo --target platformio

The command prints a sample JSON bundle with one AI module, one model contract, and one ROS-style serial bridge. The route sample prints a matching AI route policy, runtime state, and decision. The route checker turns that decision into a pass/fail gate for target selection, stale snapshots, degraded fallback, unavailable routes, and open endpoint circuits. It can simulate on-device, remote API, edge-sidecar, and hybrid contracts by changing backend, preference, budget, readiness, stale-age, and endpoint-failure arguments. The route matrix checker validates local, remote API, edge sidecar, stale snapshot, degraded fallback, and unavailable scenarios in one gate. The AI preflight checker runs before inference and rejects oversized buffers, insufficient module RAM, missing local arenas, missing AI capabilities, stale snapshots that exceed invocation limits, degraded fallback, unavailable routes, and open endpoint circuits according to explicit policy flags. The ROS preflight checker validates bridge payload, response-capacity, queue-depth, parameter-size, and timeout bounds before a ROS agent or transport is contacted. The report samples print sealed fixed reports that can be fed directly into decode-report. The sensor sample emits deterministic fixture records and injected-fault summaries. The actuator sample emits deterministic servo command records with deadline and readback summaries. The recovery sample emits a deterministic health-counter timeline for notify and reboot escalation drills. The recovery matrix checker validates ignore, retry, notify, reboot, OK-reset, fixed-plan execution, dependency-impact reboot planning, runtime state bookkeeping, and output-buffer backpressure paths in one gate. The watchdog sample emits heartbeat and expiry events for liveness planning. The watchdog matrix checker validates non-mutating prechecks, expiry mutation, heartbeat reset, multi-module expiry, and capacity errors. The scheduler sample emits deadline jitter counters for timing-policy checks. The scheduler matrix checker validates on-time, tolerance, deadline-miss, wraparound, reset, and invalid configuration paths. The event-log sample emits fixed-ring pressure, dropped-event, and recent-record summaries. The event log matrix checker validates capacity, overwrite, recent-order, severity-threshold, zero-capacity, and invalid-input paths. The quota sample emits fixed-capacity resource reservations, releases, remaining budget, and total usage. The quota matrix checker validates registration capacity, reserve, release, total-use, identity, limit, underflow, and overflow paths. The degraded-mode sample emits a pressure reason plus the enabled and disabled module sets selected by the same criticality-first policy used by the kernel planner. The degrade matrix checker validates flash, RAM, pool, module-limit, same-criticality, capacity, and essential-module pressure paths. The runtime drill sample combines degraded-mode planning, quota usage, fixed-ring event logging, and recovery escalation in a single host-side JSON scenario, including a recovery summary with action counts, final state, and reboot requirement flags. The project sample emits a deterministic contract-first starter template as JSON for standalone SDK, Arduino, PlatformIO, Python host, or Python board bridge workflows. The project writer creates the same starter files under the selected output directory and refuses to replace existing files unless --overwrite is passed. The project checker reports target detection, module count, discovered files, and validation errors as JSON. It returns non-zero when the project is invalid. The starter-template checker verifies every generated starter target in a temporary directory before packaging or publishing template changes. VS Code users can run the generated NobroRTOS: Check Project task from the starter project. The Python surface checker validates the top-level package re-export list without importing the package, catching missing __all__ entries and stale imports before release tooling publishes a partial host API. The CLI command surface checker validates command registration and README coverage together, catching stale tool documentation before users copy a dead command into a local workflow. The runtime drill checker applies pass/fail limits to disabled modules, reboot actions, and dropped event-log records, then returns a non-zero process status when a limit is exceeded. The software surface checker is the recommended pre-package gate for host-side validation. It combines the host contract, SDK/package metadata, public C/C++ headers, Python public surface, CLI command surface, starter templates, AI route matrix, AI preflight matrix, recovery matrix, ROS preflight matrix, watchdog matrix, scheduler matrix, event log matrix, quota matrix, degrade matrix, startup matrix, boot summary matrix, bundle matrix, report matrix, and runtime drill gates into one JSON report. The startup sample emits a deterministic dependency order for the runtime module set, making startup sequencing reviewable before firmware code is assembled. The startup matrix checker validates no-dependency, chain, fan-in/fan-out, unknown-node, self-cycle, duplicate-edge, and cycle paths. The boot summary matrix checker validates first-diagnostic priority, diagnostic-code layout, checksum corruption, adapter failure labels, and per-status counts. The bundle matrix checker validates module naming, capability ownership, AI/ROS descriptor uniqueness, hard-realtime deadlines, startup dependency errors, and JSON roundtrip stability.

Validate the repository host contract against the Python enums:

python -m nobro_rtos check-host-contract

From the repository root, use the local tool wrapper:

python tools/nobro_contract_tool.py doctor
python tools/nobro_contract_tool.py check-host-contract
python tools/nobro_contract_tool.py check-distribution-metadata
python tools/nobro_contract_tool.py check-public-headers
python tools/nobro_contract_tool.py check-python-surface
python tools/nobro_contract_tool.py check-cli-command-surface
python tools/nobro_contract_tool.py check-software-surface
python tools/nobro_contract_tool.py check-starter-templates
python tools/nobro_contract_tool.py check-ai-route
python tools/nobro_contract_tool.py check-ai-route-matrix
python tools/nobro_contract_tool.py check-ai-preflight-matrix
python tools/nobro_contract_tool.py check-ros-preflight-matrix
python tools/nobro_contract_tool.py check-recovery-matrix
python tools/nobro_contract_tool.py check-watchdog-matrix
python tools/nobro_contract_tool.py check-scheduler-matrix
python tools/nobro_contract_tool.py check-event-log-matrix
python tools/nobro_contract_tool.py check-quota-matrix
python tools/nobro_contract_tool.py check-degrade-matrix
python tools/nobro_contract_tool.py check-startup-matrix
python tools/nobro_contract_tool.py check-boot-summary-matrix
python tools/nobro_contract_tool.py check-bundle-matrix
python tools/nobro_contract_tool.py check-report-matrix

Decode a boot diagnostic code:

python tools/nobro_contract_tool.py decode-boot 0x04040003

Validate a contract bundle JSON file:

python tools/nobro_contract_tool.py validate-bundle path\to\bundle.json

Decode a report JSON file:

python tools/nobro_contract_tool.py decode-report manifest path\to\manifest_report.json
python tools/nobro_contract_tool.py decode-report adapter_compatibility path\to\adapter_report.json
python tools/nobro_contract_tool.py decode-report board_package path\to\board_package_report.json
python tools/nobro_contract_tool.py decode-report admission path\to\admission_report.json
python tools/nobro_contract_tool.py decode-report runtime path\to\runtime_report.json
python tools/nobro_contract_tool.py decode-report health path\to\health_report.json
python tools/nobro_contract_tool.py decode-report event_log path\to\event_log_report.json
python tools/nobro_contract_tool.py decode-report module_runtime path\to\module_runtime_report.json
python tools/nobro_contract_tool.py decode-report degrade_application path\to\degrade_report.json
python tools/nobro_contract_tool.py decode-report ai_model path\to\ai_model_report.json
python tools/nobro_contract_tool.py decode-report ros_bridge path\to\ros_bridge_report.json

AI and ROS report decoding includes host-contract labels for backend, route-preference, and transport fields while preserving the raw numeric record. Runtime diagnostics decode fixed timestamps, module labels, health counters, event-log payload fields, and degraded-mode summary counters.

Summarize a boot report bundle:

python tools/nobro_contract_tool.py summarize-boot path\to\boot_reports.json

The boot summary output mirrors the host contract: it includes diagnostic_code, diagnostic, pass_count, missing_count, in_progress_count, fail_count, corrupt_count, and the full slot list.

Tests

The current tests use only the Python standard library:

$env:PYTHONDONTWRITEBYTECODE = "1"
python -m unittest discover -s tests