v1.5.3: OPC UA Discovery, Tag Browser & Adapter Hardening

Version 1.5.3 brings a major usability upgrade with visual OPC UA Discovery and tag browsing, alongside deep adapter hardening for OPC UA, SNMP, and MTConnect protocols.

✨ New Features

OPC UA Discovery

Automatically discover OPC UA servers, endpoints, security configurations, and authentication options on your network - no manual URL entry required.

• Network-Wide Server Discovery: Scans the selected gateway's network for OPC UA servers with zero-config support.
• Hierarchical Endpoint View: Displays servers, endpoints, security modes/policies, and auth types in an interactive tree.
• One-Click Configuration: Selected endpoint settings (URL, Security Mode, Security Policy) are automatically applied to the device profile.
• Preflight Connection Test: Validates connectivity before saving to catch configuration issues early.
• AES Security Policy Support: Full support for Aes128_Sha256_RsaOaep and Aes256_Sha256_RsaPss policies in discovery and connection flows.

OPC UA Tag Browser

Browse the OPC UA server's address space visually and import tags with a single click.

• Live Node Hierarchy: Displays Objects, Variables, and Folders from the server in real time.
• Bulk Selection: Select individual nodes or use "Select All Variables" for fast tag import.
• Node Metadata: Shows Node ID, Category, Type, and live Value for each node.

MTConnect Tag Browser

• Browse Tags Flow: Browse MTConnect hierarchy from the device profile with gateway-routed edge discovery.
• Selection Sync: Selected DataItems and Conditions are synchronized directly into profile tags.

SNMP Tag Browser

• MIB Walk Browser: Browse SNMP OID trees visually from the device profile.
• Gateway-Routed Discovery: All SNMP walks are executed through the selected edge gateway.

Card View for List Pages

Devices and Outbound Channels list pages now support a Card layout alongside the default grid. The card view provides a visual overview with protocol logos, connection status, and key metadata at a glance.

🔧 Improvements

Clone Action & Naming UX

• Clone Availability Expanded: Clone is now available for Rules, Rule Actions, and Functions list pages.
• Dashboard Clone Naming: Cloned dashboards now get an automatic timestamp suffix to prevent duplicate names.
• Consistent Clone Experience: Clone visibility and behavior were aligned across supported entities in Blazor list views.

OPC UA Adapter Hardening

• Certificate Validation Leak Fix: CertificateValidation handler is now hooked once per adapter instance, preventing memory leaks on reconnections.
• Batch Read Tag Quality: Individual tag quality is now reported per-node in batch reads instead of all-or-nothing.
• Identity Fallback: Automatically falls back to anonymous authentication when username/password credentials are rejected.
• Dead Field Removal: Removed unused fields and duplicate ConnectTimeout parsing logic.

SNMP Adapter Hardening

• Client Leak Fix: SNMP client is now properly disposed on disconnect, preventing socket exhaustion.
• Race Condition Fix: GetAsync now operates on a snapshot copy of the request list to prevent concurrent modification.
• Float/Double Precision: OctetString values are now parsed with correct IEEE 754 precision for Float and Double types.
• DNS Hostname Fallback: Supports DNS hostnames in addition to IP addresses for SNMP targets.
• Timeout Override Fix: Configure() no longer overrides SendTimeout/ReceiveTimeout values set by the polling engine.

Fieldbus Reliability Model

• Protocol Error Safety: ProtocolError is now treated as connection-level by default to avoid masking real communication failures.
• Source-Aware Classification: Tag-scope error detection distinguishes adapter protocols (OPC UA, SNMP, MTConnect) from other field protocol families.
• Cached Parser Delegates: Address parse delegates are cached by protocol to minimize reflection overhead in hot error paths.

Logs Button for Rules & Integrations

• Rule Logs: Rule detail view now includes a "Logs" button that opens a filtered popup showing all rule engine logs related to that specific rule.
• Rule Action Logs: Rule Action detail view now includes a "Logs" button filtered to notification worker logs for that action.
• Notification Channel Logs: Notification Channel detail view now includes a "Logs" button filtered by notification type (Email, SMS, Push, etc.).
• Outbound Channel Logs: Outbound Channel detail view now includes a "Logs" button filtered to dispatcher logs for that specific channel.

All log popups include a Refresh button for live monitoring and support both ClickHouse and TimescaleDB backends.

Logging Migration

• ZLogger Adoption: OPC UA and SNMP adapters migrated from Console.WriteLine to structured ZLogger logging for consistent log formatting and filtering.

📖 Documentation

• Tag Browser Guide: New dedicated page covering all three protocol browsers (OPC UA, SNMP, MTConnect) with workflow steps, screenshots, and troubleshooting.
• SNMP Guide: New full reference for SNMP driver - connection parameters, SNMPv3 security, OID addressing, tag browsing, and data types.
• OPC UA Guide: Added Discovery workflow, Tag Browser guide, certificate trust documentation, and new troubleshooting entries (BadSecureChannelClosed, BadSecurityChecksFailed).
• Troubleshooting: Expanded OPC UA error reference with secure channel and security policy errors.