Client cann't receive message when the number of offline messages has reached ‘max_mqueue_len’

[petersom]

The server has large pool messages, The number of offline messages has reached ‘max_mqueue_len’, MQTTClient can connected success, but can't receive message!

Connecting to the same server and other platforms is normal， this problem has never occurred， ex: Android, Web ...

Environment

• Operating system: iOS
• Software version: all
• Package Manager: Cocoapods
• MQTTClient version: 0.15.3
• MQTT Broker used: EMQX 3.2.2

The server's config zone.external.max_mqueue_len is default 1000

Session(xxx, clean_start=false, expiry_interval=1296000, subscriptions_count=331, max_inflight=32, inflight=32, mqueue_len=1000, mqueue_dropped=4013, awaiting_rel=0, deliver_msg=29601, enqueue_msg=32706, created_at=1587007794)

Connected successfully, sub successfully and can send messages sucessfully except receive message

It has happened many times， many users

help!!

[zqeq]

我们这边也是这个情况，看日志和现象我们这边飞行队列里都是发送不出去的消息，这些消息占满了飞行队列导致没法再接收消息，通过调小飞行队列最大值，可以复现了现象，具体为什么队列消息不消化定位不到问题。

[petersom]

我们决定放弃这个库了，没人维护