Collision Timeout

[Gurgel100]

Hello everyone,

My question is related to the MqttState(CollisionTimeout) error. When can this happen?
In my scenario the server only allows for a maximum of 100 inflight publishes. It can happen that I send more than 100 publish messages (with QoS::AtLeastOnce) in a short time and therefore the send queue overflows. When this happens it nearly always happen to give back a MqttState(CollisionTimeout) error. Is my assumption correct that the broker doesn't acknowledge the old packets fast enough?.

[de-sh]

According to this code CollisionTimeout happens when for more than 2 cycles of the keepalive being triggered, packet that had collided still remains present in state, i.e. not sent onto network.

[Gurgel100]

Thank you for your response. I found it myself too.