Cedalo support on MQTT 3.1.1

[sreenivasan]

@Tizian

the allowed protocol are allowed to connect.

Ok, let me make it bit more clear. Brokers with MQTT 3.1.1 exhibit packet retransmission in case of loss of puback messages which is not supported in MQTT5. Please refer to the case below for more information:

Message retry upon loss of packets in QOS1, without reconnection

Hi, With TCP you can expect that your packets arrive exactly in the order that you sent them, or not at all. If the packets ultimately do not arrive then the connection is considered to have dropped, and a new connection is required. There is no scenario with TCP where some packets go missing but the connection has not restarted. In MQTT v3.1.1 retrying message delivery during a session was allowed, however it is a fundamentally bad idea to implement this. The reason is this - if you have a re…

So, if we set the configuration of the broker as 3.1.1, does the broker re-transmits the packet when it doesn’t receive puback from subscriber (check the above case for for more information)?

We want only the features of MQTT3.1.1. at broker end and not MQTT5 features. Hope it is clear now.