Updated exserver logic for dynamic topic publishing and subscribing

[KaveeshTennakoon]

Purpose

MQTT wildcard topic authorization was failing for both dynamic subscription and publishing operations due to inflexible topic matching logic

Goals

Enable proper authorization for multi-level wildcard dynamic subscriptions and improve publish topic matching while maintaining backward compatibility

Approach

Created isTopicMatch method in ExServer.java to handle multi-level wildcards and updated both subscription and publish authorization logic:

• Subscribe: Allow scopes with sufficient single-level wildcards (+) to authorize shorter topic prefixes with #
• Publish: Use the improved isTopicMatch method instead of exact string matching for better wildcard support