mosquitto 2.1+ MQTT server limits packet size to 2M by default

[Baggypants]

After recently upgrading mosquitto I had issues with MQTT and noticed this issue

daabb899fa4d 1782981874: New client connected from 10.89.0.15:40816 as viseron (p4, c1, k10, u'homeautomation').
daabb899fa4d 1782981874: Client viseron [10.89.0.15:40816] disconnected: oversize packet.

eclipse Mosquitto now defaults max_packet_size to 2M rather than the unlimited it had before.

https://mosquitto.org/man/mosquitto-conf-5.html

It might be worth adding a note to the documentation that Viseron sends large packets and the server will need to be configured to work with this.

[Baggypants]

Also a suggestion of what an expected packet size might be could be helpful, I've set mine to max_packet_size 20000000 as suggesed here: home-assistant/addons#4570

[ulanking]

That's why I just went ahead and started running my own Mosquitto server . . . .

[roflcoopter]

Interesting, yes i can definitely add something to the docs.
Its hard to make a suggestion of the expected packet sizes since that is determined by camera resolution tho

[Baggypants]

From the docs

For MQTT v5 clients, it is possible to have the server send a "maximum packet size" value that will instruct the client it will not accept MQTT packets with size greater than value bytes. 

Maybe it would also be possibly to log a message that says what the maximum size was attempted when it was denied? That way the admin could configure the server appropriately.