EOL (End-of-Line) Diagnostic Sequences

#!/usr/bin/env python3
# EOL diagnostic sequence: executed on production line for each vehicle unit
import udsoncan, time
from udsoncan.client import Client

def eol_sequence(client, vin: str, variant_code: int) -> dict:
    results = {}

    # Step 1: Establish session and security
    client.change_session(udsoncan.services.DiagnosticSessionControl.Session.extendedDiagnosticSession)
    security_access(client, level=1)

    # Step 2: Write VIN
    vin_bytes = vin.encode('ascii').ljust(17, b'')[:17]
    resp = client.write_data_by_identifier(0xF190, vin_bytes)
    results['VIN_write'] = 'PASS' if resp.positive else f"FAIL NRC 0x{resp.code:02X}"

    # Step 3: Write variant code
    resp = client.write_data_by_identifier(0x0200, bytes([variant_code]))
    results['Variant_write'] = 'PASS' if resp.positive else f"FAIL NRC 0x{resp.code:02X}"

    # Step 4: Actuator test — cooling fan
    fan_resp = client.io_control(0x0210, udsoncan.IOMasks(),
                                  control_option_record=bytes([0x03, 0x64]))  # 100%
    time.sleep(2)
    # Read feedback DID to verify fan running
    feedback = client.read_data_by_identifier(0x0211)
    fan_rpm = int.from_bytes(feedback.service_data.values[0x0211], 'big')
    results['Fan_test'] = 'PASS' if fan_rpm > 800 else f"FAIL: RPM={fan_rpm}"
    client.io_control(0x0210, udsoncan.IOMasks(), control_option_record=bytes([0x00]))

    # Step 5: DTC clearance
    resp = client.clear_dtc(0xFFFFFF)
    results['DTC_clear'] = 'PASS' if resp.positive else "FAIL"

    # Step 6: EOL activation (one-time, irreversible)
    resp = client.routine_control(0x01, 0xDEAD, bytes([0x01]))  # EOL lock
    results['EOL_lock'] = 'PASS' if resp.positive else "FAIL"

    return results