nRF Cloud disconnects

[PeterC]

Hello,

I am trying to do a long term connection test to the nrfcloud. I have updated the nordic sdk to v1.2.0 and am running the asset tracker on the dk board. I have set the data upload to 21600 seconds (every 6 hours) and set power saving mode on. However when checking the device status after a period of time, the nrfcloud device window shows the device as disconnected. Does the nrfcloud automatically disconnect devices after a period of time? The device appears to be registered on the network, see below. Network is verizon. 

Am I missing something?

Thanks

AT+CEREG?+CEREG: 2,5,"2698","0BE3B211",7OK
AT+COPS=3,2OK
AT+COPS?+COPS: 0,2,"310410",7OK
AT%XCBAND%XCBAND: 17OK
AT+CGDCONT?+CGDCONT: 0,"IP","ibasis.iot","10.160.136.100",0,0OK
AT+CGACT?+CGACT: 0,1OK
AT%CESQ=1OK
AT+CESQ+CESQ: 99,99,255,255,7,40OK
AT%XSIM=1OK
AT%XSIM?%XSIM: 1OK
AT+CPIN?+CPIN: READYOK
AT+CPINR="SIM PIN"+CPINR: "SIM PIN",3OK
AT+CIMIxxxxxxxxxxxxxxxOK

at+cgatt?
+CGATT: 1
OK

at+cedrxrdp
+CEDRXRDP: 4,"0101","0101","0001"

[Didrik Rokhaug]

Hi.

 

Does the nrfcloud automatically disconnect devices after a period of time?

 Yes it does. The nrf_cloud library uses a keep-alive time of 60s by default, while AWS (which nRF Cloud is built on) allows a keep-alive time of up to 1200s.

Best regards,

Didrik

[Marshed]

If that is the case, how do we keep these devices connected all the time?

[Didrik Rokhaug]

Hi Marshed.

The device communicates with nRF Cloud using MQTT, where you can send keep-alive packets to keep a connection alive, while not sending any data.

In the application, you set the keep-alive interval (it can be smart to set it a bit shorter than the interval the server use, to account for latency in waking up, etc.), and call mqtt_live regularly.

Best regards,

Didrik

[Marshed]

Has the nrf_cloud library default keep-alive time changed from 60s to 300s? I am getting a problem when I send ping after the nrf_cloud has disconnected I do not receive any error. Can you assist?

[Didrik Rokhaug]

I couldn't see any changes to the default values. If you are using the asset_tracker, the MQTT_KEEPALIVE value has been set to 1200.

If you are having problems, I recommend you open a new ticket where you describe your application, and the problem you are seeing.

[Marshed]

I am using lte_ble_gateway, and I sending a ping after the device is disconnected from nrf_cloud, however i do not get any error message. please assist