Hardware1 hOctober 1, 2026, 20:46

ESP32 turned into a TCP proxy that tunnels traffic over MQTT

A developer released ESP-MQTTunnel, a working PoC that turns an ESP32 into a hardware proxy tunneling raw TCP traffic over an MQTT broker, bypassing firewalls without open ports or a public IP. Tested with an ESP32-S3, HiveMQ Cloud free tier and Firefox on Windows 10; TLS is relayed without interception.

DEV Community

Open source

ESP32 turned into a TCP proxy that tunnels traffic over MQTT

ESP32 subscribes to an MQTT req topic and opens real TCP sockets to target hosts
Traffic relays through free HiveMQ Cloud with no TLS interception
YouTube, Gmail, X and Reddit work; Instagram gets stuck
Limited ESP32 resources prevent loading many tabs at once

#ESP32#MQTT#HiveMQ

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Software

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Hardware

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Hardware

ESP32 turned into a TCP proxy that tunnels traffic over MQTT

LakeShark firmware turns LilyGO T-Display P4 into a handheld ESP32-P4 SDR scanner

Google Maps on Android Auto now shows traffic lights and stop signs at your next turn

CAS Institute of Semiconductors Demonstrates Sliding Ferroelectric Tunnel Junction With Giant TER

New 5,291-ton tunnel machine spans 54.7 feet and can handle steep curves