Minor release with the following improvements and bug fixes:

Improvements:

• Core:
  • REST API documentation:
    • Described entities and methods;
    • Authorize via user name and password;
    • Latest version of Swagger;
  • Help pages for user-defined JS functions:
    • Described input parameters;
    • Examples for various use cases;
    • Help content is loaded from the external project;
    • Ability to configure the external help url using 'UI_HELP_BASE_URL' parameter;
  • Performance of SQL queries:
    • Protection from an infinite recursion;
    • Ability to configure max levels of recursion using 'SQL_RELATIONS_MAX_LEVEL' parameter;
    • Timeout for all SQL queries to survive enormous heavy query using 'JAVAX_PERSISTENCE_QUERY_TIMEOUT' parameter;
  • Bulk import improved and moved to back-end;
  • Rule chains import/export improved;
  • Separate buffered rate executors for Cassandra read and write queries;
  • Entities text search by 'substring' instead of 'startsWith';
  • Improve REST API error response handling;
  • Added fields length validation;
• Security:
  • Support of SSL credentials configuration to setup HTTPS without SSL termination on the load balancer.
  • Support of PEM format for certificates;
  • Unified transport SSL credentials;
• Transport:
  • HTTP/2 configuration support;
  • Added out-of-the-box support for Efento water-meter devices;
  • MQTT backward compatibility adaptor to support both JSON and Protobuf during firmware upgrade;
• Rule Engine:
  • Add option for HTTP client rule node to not create any message body;
  • Optimize retry strategy to correctly take into account all available settings: 'retryFailed', 'retryTimeout' and 'retrySuccessful;
  • Fixed parsing of updated polygon coordinates in rule engine;
  • Fixed duplication of MQTT packets in the MQTT Rule Node;
• UI:
  • New widget settings layout;
  • Protobuf editor for MQTT device transport configuration
  • QR code widget. Added helps for qrcode and markdown widgets;
  • Updated dependencies: lodash and coreJS;
  • Save translated title as 'translatedDashboardTitle' variable;
  • Multiple Attributes widget: added select type for input;
  • Optional data sources handling;
  • Update 'zh_CN' locale;
  • Added no data display message to entities and alarm tables;
  • Added "toastTargetId" of widget-container to the "widgetContext";
  • Added argument 'updatedData' in function 'updateNode' in nav-tree component;
  • Style of the mqtt transport settings in the device profile;
• Build scripts:
  • K8S deployment instructions and scripts for AWS EKS;
  • Cache cleanup added to the upgrade scripts;
  • Logging of the progress during upgrade;

Bug fixes:

• Core:
  • Fixed security check in the 'getPersistedRpcByDevice' api call;
  • Fixed Class Loader(CL) issues in Fork Join Pool after Java 11 migration. Replaced system CL with current thread CL.
  • Fixed default ordering in entity queries;
  • Fixed concurrency exception when deleting relation
  • Can not use isolated tenant profiles in monolith setup;
  • Fixed rest client json converter to parse json array;
  • Set serialVersionUID for cached entity classes: Device and Tenant Profile, etc;
  • Bump hsqldb version to 2.6.1 to fix sql timeout issues;
• Rule Engine:
  • Default alarm details script function may cause infinite metadata growth;
  • Deprecation of 'delay' rule node;
  • Fixed NPE in the send rpc request node;
  • Fix upgrade of device profile alarm rules from version 3.2.2;
  • Corrected current relations deletion in the create relations rule node;
• Transport:
  • LwM2M:
    • Fix NPE in case model is null;
    • Clear logging;
    • Process 'device deleted' event from core;
    • Process 'update credentials' event from core;
  • MQTT:
    • Fixed log typos in MqttTransportHandler;
  • COAP:
    • Fixed acknowledgement of CoAP requests;
• UI:
  • Fixed camera input widget if entity is empty;
  • Fixed duplicated requests on aliases entity autocomplete;
  • Fixed map functions. Update map helps.
  • Fixed using boundary values for digital gauge widget;
  • Fixed gauge widgets incorrect display after some time of work;
  • Fixed display toast in fullscreen dashboard mode;
  • Fixed 'copy text' in markdown to work in plain HTTP;
  • Fixed not load advanced settings in widget;
  • Fixed Trip animation: fixed calculate start/endpoint; fixed update current position;
  • Remove invalid JSON form fields in the time series table;
  • Set pagination to the first page after update in table widgets;
  • Not correct index in map-utils 'parseData' function;