The format is based on[Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and this project adheres to[Semantic Versioning](https://semver.org/spec/v2.0.0.html).

- Fixed`topic_matcher` and`topic_filter` to properly match parent with multi-level ('#') wildcard.

- Slight optimization of`topic_filter` to do simple string comparison if the filter does not contain wildcards.

-[#556](https://github.com/eclipse-paho/paho.mqtt.cpp/pull/556) fix potential deadlock in`thread_queue` on capacity increase.

-[#559](https://github.com/eclipse-paho/paho.mqtt.cpp/pull/559) prevent undefined behaviour on empty topic matching

- Fix the bundled Paho C build foc C23 compilers by forcing C99 compliance in CMake build

cmake_minimum_required(VERSION 3.13)

project(PahoMqttCppVERSION"1.5.3")

project(PahoMqttCppVERSION"1.5.4")

- Fix a large number of CMake build issues

- Updated the GitHub CI

- (v1.5.3) Fixes for building this library and the Paho C library with the latest C & C++ compilers, like Clang 20 and GCC 15 which created some breaking hcanges for legacy code.

For the full list of updates in each release, see the[CHANGELOG](https://github.com/eclipse-paho/paho.mqtt.cpp/blob/master/CHANGELOG.md).

Summary: MQTT CPP Client

Name: paho-cpp

Version: 1.5.3

Version: 1.5.4

Release: 0%{?dist}

License: Eclipse Eclipse Public License 2.0 and Distribution License 1.0

Group: Development/Tools

#if defined(PAHO_MQTTPP_VERSIONS)

constuint32_t PAHO_MQTTPP_VERSION =0x01050003;

constuint32_t PAHO_MQTTPP_VERSION =0x01050004;

const stringPAHO_MQTTPP_VERSION_STR("Paho MQTT C++ (mqttpp) v. 1.5.3");

const stringPAHO_MQTTPP_VERSION_STR("Paho MQTT C++ (mqttpp) v. 1.5.4");

const stringPAHO_MQTTPP_COPYRIGHT("Copyright (c) 2013-2025 Frank Pagliughi");

#else

constuint32_t VERSION =0x01050003;

constuint32_t VERSION =0x01050004;

const stringVERSION_STR("Paho MQTT C++ (mqttpp) v. 1.5.3");

const stringVERSION_STR("Paho MQTT C++ (mqttpp) v. 1.5.4");

const stringCOPYRIGHT("Copyright (c) 2013-2025 Frank Pagliughi");

#endif