没有更多设备能够连接到 MQTT 适配器。适配器日志包含消息DefaultConnectionLimitManager - Connection limit (1) exceeded
。这是什么意思?
[vert.x-eventloop-thread-1] DEBUG o.e.h.s.l.DefaultConnectionLimitManager - Connection limit (1) exceeded
[vert.x-eventloop-thread-1] DEBUG o.e.h.a.m.i.VertxBasedMqttProtocolAdapter - connection request from client [clientId: mosqsub] rejected due to Connection failed: CONNECTION_REFUSED_SERVER_UNAVAILABLE