MQTT-SN gateway reconnection

[kalpino]

Hello,

I'm using SDK for Thread v.4.1.0 along with nRF52840 microcontroller. Starting from MQTT-SN examples I developed a Thread network with multiple nodes, publishing data on different topics.
I have some concerns about management of reconnection to MQTT-SN gateway.

The procedure I follow at initialization is: Gateway Search, Connection to gateway, topic registration, topic subscription. I basically replicate what is done in the two MQTT-SN examples in SDK.

My question: while reconnecting, following a disconnection from the gateway, do I need to register and subscribe all topics again? I know MQTT-SN allows to receive at connection a message with all topics previously registered and subscribed. I wonder if this version of SDK has implemented this feature.

Thanks!

[Edvin]

Hello,

I have not tested this.

It sounds like you have tried the example. What happens if you try to disconnect and reconnect? (try power cycling one of the DKs, or take them far appart and back together). Are they still subscribed?