RE: MQTT Keepalive

Håkon Alseth — Fri, 03 Nov 2023 13:05:45 GMT

Hi,

There are several services in-between the client and the server in this case, and it highly depends on what the NAT timeout in your network is:

RE: nrf9160 mqtt keep alive longer than 30 minutes not working

It is quite common that networks can have several minutes before a TCP connection is terminated (via. either firewall/NAT etc in the network chain). I would recommend that you try to reduce the KEEP_ALIVE and see what is working for your specific network. Alternative is to contact your tele-network provider and ask what the NAT timeout is, but it is generally easier to reduce the KEEPALIVE to a lower value until it starts keeping the connection successfully between each "ping".

[quote user=""]But the reason for the loss of connection to the cloud is reported as "MQTT_KEEP_ALIVE_TIMEOUT", and the "keepalive" timer is set to 1200. So does that mean the if there is no MQTT activity for 1200 seconds that the cloud connection automatically shuts down?[/quote]

No, it means that it will contact the server each configured KEEP_ALIVE_TIMEOUT (in seconds). If nothing happens in 1200 seconds, it will to a ping to the server to maintain the connection.

Kind regards,

Håkon