nRF9160 Connection Status

[John]

We are using v0.4.0 lte_ble_gateway example running on an nRF9160-DK (0.8.5)

We are successfully pushing data from the UART on the nRF52840 to the nRF9160

Also managed to connect to AWS MQTT and successfully gather the published data to present to our UI.

However we are experiencing some trouble where after (usually) an extended period of many hours whereby the nRF9160 seems to think it's connected to AWS, whereas by looking at the logs we have created on AWS we know that the nRF9160 is most certainly disconnected.

This constitutes a complete failure of our system.

A reset of the nRF9160 fixes the problem immediately.

We have currently implemented a sys_reboot every 30 minutes as a work around, which is most certainly not ideal.

It would be fantastic if someone could help us solve this mystery, else it will mean proceeding in the dark with already complex code.

[Sigurd]

Hi,

Are you using the latest modem fw ?

Do you have any log output from the nRF9160 when this happens ?

[John]

We are using the latest modem firmware. Unfortunately we do not have log output from the 9160. However we do know that there will have been multiple disconnects and reconnects before finally failing.

I have no idea if I'm correct in suggesting a scenario whereby the code may not be releasing sockets properly?

[John]

Just managed to get this log

Received: TA6D1BD40E6ED/A6D1BD40E6ED/12CC07172BE8/0220022FFF532905
Sending temperature TA6D1BD40E6ED/A6D1BD40E6ED/12CC07172BE8/0220022FFF532905
Pinging...Sending ping Feed the Rabbit
OZARK_CLOUD_EVT_TRANSPORT_DISCONNECTED
OZARK_CLOUD_EVT_TRANSPORT_CONNECTED
Exception occurred in Secure State
**** HARD FAULT ****
Fault escalation (see below)
**** BUS FAULT ****
Precise data bus error
BFAR Address: 0x50008120
**** Hardware exception ****
Current thread ID = 0x20021360
Faulting instruction address = 0x2903c
Fatal fault in ISR! Spinning...

[Marjeris Romero]

Hi John,

Could try setting 'CONFIG_ASSERT=y' to see if you get any more useful information in the logs?

Best Regards,

Marjeris