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net4mqtt is a lightweight Windows utility published by binbat that exposes a local SOCKS v4 proxy server and forwards every TCP connection it accepts to a remote destination that is resolved and tunneled through an MQTT broker. Designed for environments where only MQTT traffic is allowed, the application lets any existing TCP-based program—from legacy database clients to modern web browsers—operate without modification by simply pointing it at the localhost SOCKS proxy that net4mqtt creates. Typical use cases include bypassing restrictive corporate firewalls that whitelist only MQTT, enabling remote desktop or SSH sessions across IoT message infrastructures, and providing ad-hoc VPN-style connectivity for field devices that already publish telemetry to an MQTT broker. The tool is especially popular with industrial engineers who need to reach PLCs or SCADA systems isolated behind Layer-7 filters, as well as penetration testers who want to demonstrate covert channels over approved IoT protocols. Because the SOCKS v4 handshake is stateless and the MQTT layer handles retransmission automatically, sessions survive brief broker outages and automatically reconnect when the network recovers. net4mqtt keeps no persistent configuration; credentials, broker address, and topic namespace are supplied at launch through concise command-line arguments, making it easy to script or embed in larger automation workflows. The program ships as a single portable executable that requires no installation, so it can be carried on removable media and run on locked-down hosts without administrative rights. Version 0.7.3, the second public release, tightens memory usage and adds optional TLS encryption to the MQTT link, ensuring that tunneled payloads remain confidential even when the broker itself is shared across tenants. net4mqtt is available for free on wget.nero.com, with downloads provided via trusted Windows package sources such as winget, always delivering the latest version and supporting batch installation of multiple applications.
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