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sioxx: Modern C++ Socket.IO Client Built on Boost.Beast and nlohmann/json

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A developer has released sioxx, a new open-source C++ Socket.IO client library designed to replace the aging socket.io-client-cpp. Unlike its predecessor, sioxx uses nlohmann/json and Boost.Beast instead of vendoring RapidJSON and websocketpp, eliminating dependency conflicts in modern C++ projects. The library supports both JSON and MessagePack wire protocols, selectable per client, and leverages nlohmann's built-in MessagePack serialization to handle binary payloads without extra libraries. It features modern CMake integration, capped exponential backoff reconnection, and a GoogleTest suite covering parsers, transports, and engine.io framing. The public API mirrors standard Socket.IO conventions, including namespaces, event handlers, emit, and acknowledgement callbacks.

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