OOM?

[ydddx]

version : 1.4.1
code

When the MQTT service is offline, the memory grows without any limit until the application crashes. After the service comes back online, the increased memory is not released.

[ydddx]

I found the issue. When the MQTTAsync_commands queue is full and old messages are deleted, the onFailure callback in the token is not executed, which causes the pendingDeliveryTokens_ to grow indefinitely and eventually lead to an out-of-memory (OOM) issue.

[ydddx]

I added the following code, and it seems to be running well so far. However, I haven't read all the code, so I can't be sure if it introduces any additional issues.