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https://github.com/agessaman/MeshCore.git
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agessaman
53c39dc282
The esp-mqtt task drains only one QUEUED outbox item per loop iteration, and each iteration blocks up to MQTT_POLL_READ_TIMEOUT_MS (1s) on esp_transport_poll_read. With little inbound traffic that caps throughput at ~1 message/second per connection, so even a light packet rate (~1.2/s) outruns the drain: the outbox pins at its cap and ~20-30% of QoS0 packets are dropped as backpressure. The poll timeout is a compile-time constant baked into the precompiled esp-mqtt lib, so the async drain rate cannot be raised on the Arduino/IDF 4.4 toolchain. Route QoS0 packet publishes through esp_mqtt_client_publish() (async=false) so they write straight to the socket, bypassing the outbox drain entirely — QoS0 no longer touches the outbox. QoS1 status keeps the async/outbox + retransmit path. The esp-mqtt task releases its API lock before the poll, so a synchronous publish from the (Core-0, prio-1) MQTT task acquires the lock and writes immediately; a stalled socket blocks only that task (mesh RX on Core 1 and the WiFi/TCP stack are unaffected), bounded by a new setNetworkTimeout() lowered to 2500ms so a first stall fails fast and flips the slot to disconnected. The outbox cap from the previous commit stays as a dormant safety net. Retools the MQTT_DEBUG diagnostic from outbox size/drops (now always ~0) to per-slot publish ok/err counts, the live signal for delivery health, with 1-based slot numbering to match the status line.
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