nRF9160 serial lte modem use mqtt

RE: nRF9160 serial lte modem use mqtt

Didrik Rokhaug — Thu, 23 Sep 2021 14:38:58 GMT

Did the other nRF9160 use the same client ID?

Most MQTT brokers require that the client IDs are unique.

I am also not able to reproduce your missing #XMQTTEVT events.

And, if I increase the keepalive setting on the nRF9160 past the keepalive setting of the broker, I get an event saying that I am disconnected the next time the client tries to send a keepalive message.

RE: nRF9160 serial lte modem use mqtt

mokoysh — Thu, 23 Sep 2021 02:44:38 GMT

the 9160 publish topic and another mqtt client subscribe topic is same.

MQTT config keepalive=1200S，and have two hours from 11:59 to 14:01. there should be 6 times keepalive and EVENT(#XMQTTEVT:9,0) return ,but none. SO I thinks mqtt disconnect but no EVENT return

RE: nRF9160 serial lte modem use mqtt

Didrik Rokhaug — Wed, 22 Sep 2021 13:12:23 GMT

Hi,

[quote user=""]In http://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/applications/serial_lte_modem/doc/MQTT_AT_commands.html show, all MQTT operate will have EVENT return, but publish data don't have event return .[/quote]

No, that is not what is shown. #XMQTTPUB does not trigger an event if you send with QoS 0.

[quote user=""]this log show, in 11:59:46 NRF9160 publish data to server,and another mqtt client recv this data .but in 14:01:14 nrf9160 publish data,another mqtt client don't recv data .[/quote]

Are you sure the device was connected and subscribed to the correct topic?

What QoS level did you use?

I have not been able to reproduce this.

[quote user=""]by AT log in 14:01:14，9160 should be disconnected. Why the link will be disconnected？and this disconnect don't have event notification。If no notification ，I don't know when the 9160 is disconnected[/quote]

Why should it be disconnected?

Depending on the reason for the disconnect, you should get a MQTT event similar to this:

#XMQTTEVT: 1,-113

At the latest the next time the device publishes a message or sends a PING.

Best regards,

Didrik