Client does not receive messages from subscribed topics when repeatedly reconnected with same client ID and will with non-zero will-delay-interval.

[izuzanak]

Overview:

Client does not receive messages from subscribed topics when repeatedly reconnected with same client ID and will with non-zero will-delay-interval.

Steps to reproduce (non deterministic):

• Fresh broker start.
• Spam messages on topic "/mqtt/test" (qos 2).
• Connect and disconnect client (mosquitto_sub), registering will with delay interval (e.g. 10 secs), until it stops receiving spam message.

mosquitto_sub -i MosquittoSub --will-topic "/mqtt/test" --will-payload "Message_published_as_will" --will-qos 2 --will-retain -V 5 -D WILL will-delay-interval 10 -v -t '#'

Details:

• Mosquitto versions 1.6.9, 1.6.10.
• Clients are disconnected gracefully.
• Retained messages at topic "/mqtt/test" are published after subscription.
• Messages published by third client (or even by mosquitto_sub client itself) are not published by broker to mosquitto_sub client.
• Client can publish to broker and receives all PUBACK type packets while still not receiving PUBLISH messages from broker.
• Ping messages are communicated successfully.
• Seems to occur only for freshly started broker.