topfreegames / arkadiko / 23826902781

64%

master: 64%

Pull #33

github

fix: downgrade MQTT QoS from 2 to 1 to prevent dropped messages

QoS 2 (exactly-once) causes receive_maximum_exceeded errors on EMQX v5
during traffic bursts, as the broker's max_awaiting_rel limit (100) gets
overwhelmed. QoS 1 (at-least-once) uses a simpler 2-step handshake with
no awaiting_rel state, eliminating this bottleneck entirely. For chat
messages, at-least-once delivery is sufficient.

Related: emqx/emqx#13399 (broker returns wrong Receive Maximum in CONNACK)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

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