Module util 

Protocol Utilities

Contains utility functions for MQTT protocol handling including:

• Topic validation and filtering
• Variable byte integer encoding
• System topic detection

MQTT Protocol Utilities

This module provides utility functions for MQTT protocol handling, including:

• Variable byte integer length calculation
• Topic name and filter validation
• System topic detection

These utilities are used throughout the codec for validating MQTT-specific data structures and ensuring protocol compliance.

Functions

is_system_topic

Determines if a topic name represents a system topic.

is_valid_topic_filter

Validates whether a string is a valid MQTT topic filter.

is_valid_topic_name

Validates whether a string is a valid MQTT topic name.

len_bytes

Calculates the number of bytes required to encode a length value using MQTT’s variable byte integer encoding format.