ef259c8ee3
Two related v5-sweep fixes for the online/runtime tool family: 1. Auto-login helper for headless mode In headless mode each MCP call spawns a fresh CODESYS --noUI process, so the login state established by connect_to_device dies before the next call. Pre-fix, only connect_to_device and download_to_device did their own login(); the other four (start_stop_application, read_variable, write_variable, read_running_version_online) silently failed in headless with 'Application not logged in.' (start/stop) or 'Invalid expression' (read/write). They worked in persistent mode only because the login carried across calls. Added ensure_logged_in(online_app, login_wait_seconds=30) to ensure_online_connection.py. Idempotent: short-circuits via online_app.is_logged_in (persistent mode is a no-op, no extra login roundtrip). When not logged in, runs the same enum-probe + call-shape probe + STABLE_STATES settle-wait pattern as connect_to_device.py. Added to start_stop_application.py, read_variable.py, write_variable.py, read_running_version_online.py. 2. _MCP_PROJECT_VERSION GVL emitted as plain VAR_GLOBAL, not CONSTANT CODESYS inlines VAR_GLOBAL CONSTANT scalars at compile time and strips them from the online symbol table. The whole point of _MCP_PROJECT_VERSION.sVersion is to be readable live from the running PLC, so CONSTANT was the wrong storage class. read_running_version_online failed against EVERY project bumped via the old template -- 'Invalid expression' on the runtime read. Dropped CONSTANT from VERSION_GVL_DECLARATION_TEMPLATE in bump_project_version.py. Existing projects auto-migrate on the next bump because maintain_version_gvl()'s existing-GVL branch overwrites textual_declaration with the (now non-CONSTANT) template. The string is still effectively read-only at runtime -- only the bump tool updates it. read_running_version_online.py also got a more precise error message that explicitly fingerprints the 'Invalid expression' failure mode and points at the CONSTANT root cause. Useful for any user landing on a project that pre-dates this fix. Verified end-to-end against local CODESYS Control Win V3 (PLATEA, port 11740) on MCPTest2 v1.3.4.0: - connect_to_device, get_application_state, download_to_device, start_stop_application (both directions), read_variable (PLC_PRG.watchdog1 = 225 ticking), write_variable (200 -> 204 in 4s proves write took), disconnect_from_device: all 7 PASS. - read_running_version_online failure reproduced (CONSTANT inlined), fix landed -- next bump on MCPTest2 will validate. 37/37 unit/integration tests green. TEST_OVERVIEW.md updated with the v5 device sweep, with the headless-mode deep-dive, and with the broken-by-design notes on read_running_version_online.
58 lines
2.1 KiB
Python
58 lines
2.1 KiB
Python
import sys, scriptengine as script_engine, os, traceback
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VARIABLE_PATH = "{VARIABLE_PATH}"
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try:
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print("DEBUG: read_variable script: Variable='%s', Project='%s'" % (VARIABLE_PATH, PROJECT_FILE_PATH))
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primary_project = ensure_project_open(PROJECT_FILE_PATH)
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if not VARIABLE_PATH: raise ValueError("Variable path empty.")
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online_app, target_app = ensure_online_connection(primary_project)
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app_name = getattr(target_app, 'get_name', lambda: "Unknown")()
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# Auto-login -- idempotent in persistent mode, required in headless.
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ensure_logged_in(online_app)
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# Read the variable value
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value = None
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var_type = "unknown"
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if hasattr(online_app, 'read_value'):
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try:
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result = online_app.read_value(VARIABLE_PATH)
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if result is not None:
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if hasattr(result, 'value'):
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value = str(result.value)
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if hasattr(result, 'type'):
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var_type = str(result.type)
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else:
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value = str(result)
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print("DEBUG: read_value returned: %s" % value)
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except Exception as e:
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print("DEBUG: read_value failed: %s" % e)
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raise
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elif hasattr(online_app, 'read'):
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try:
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result = online_app.read(VARIABLE_PATH)
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if result is not None:
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value = str(result)
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print("DEBUG: read returned: %s" % value)
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except Exception as e:
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print("DEBUG: read failed: %s" % e)
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raise
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else:
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raise TypeError("Online application does not support read_value() or read().")
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print("Variable: %s" % VARIABLE_PATH)
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print("Value: %s" % value)
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print("Type: %s" % var_type)
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print("Application: %s" % app_name)
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print("SCRIPT_SUCCESS: Variable read successfully.")
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sys.exit(0)
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except Exception as e:
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detailed_error = traceback.format_exc()
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error_message = "Error reading variable '%s' in project %s: %s\n%s" % (VARIABLE_PATH, PROJECT_FILE_PATH, e, detailed_error)
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print(error_message)
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print("SCRIPT_ERROR: %s" % error_message)
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sys.exit(1)
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