feat(mqtt): add dual-stack IPv4/IPv6 support to MQTT bridge#25
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agessaman
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Jul 11, 2026
Reverts merge ae04539 (feat/flex-ipv6, PR #25). Enabling IPv6 joins the device into IPv6 multicast/ND processing; on multicast-heavy LANs (e.g. with a Thread/Matter border router advertising a ULA prefix) inbound bursts land in dynamic WiFi RX buffers in internal heap. Measured on a Station G2 with 4 WSS brokers: min-free floor dropped 36 KB -> 18 KB, largest free block pinned below the 16 KB publish threshold for minutes at a time, 523 dropped publishes in 15 minutes. With IPv6 disabled the floor and max-alloc recovered and publish skips stopped. The feature only fed the wifi.status display line — no transport uses IPv6 (all brokers connect over IPv4), so the fleet risk (network- dependent degradation on unknown home LANs) buys nothing. Revisit after the Arduino core 3.x / IDF 5.x move if IPv6 transport is ever needed; the branch remains at feat/flex-ipv6. Kept from the merge: the wifi.status uptime append now computes the actual remaining space in the 160-byte reply buffer instead of assuming a hardcoded 128, fixing a latent overflow of the snprintf bound.
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