I haven't been able to run lte_ble_gateway for more than 2 days

[Marshed]

Hi, 

I am have programmed my Thingy 91 device with lte_ble_gateway program to collect data from 5 Bluetooth devices and send them to the cloud. This program runs fine, however it does not appear to continue to run for more than 2 days, after that the program just goes silent. No output, no error message no nothing. 

Can someone point me in the right direction please?

[Håkon Alseth]

Hi,

Marshed said:

my program will hang. This is what I think need to be solved. 

Marshed said:

Shouldn't the program try to reconnect? or at least give error message and come out of this loop?

  the sample doesn't reconnect, unfortunately. If a disconnect occurs, you have to manually re-connect (using for instance cloud_connect()).

Does your device hang in the while-loop, in either mqtt_live() or mqtt_ping() forever? Changes to the network status might take minutes before the socket operation times out.

 

Kind regards,

Håkon

[Marshed]

Hi,

I have tested the solution of reconnecting whenever disconnection occurs, however I noticed that LTE attempts reconnection after 30 seconds, 60 seconds, 90 seconds, 1890 seconds, 3690 seconds, ..... Are these variables defined in the program? network? or modem software? If they are defined in the program where and can I change them?

Regards

Marshed  

[Håkon Alseth]

Hi,

 

Are you referring to the LTE link itself, or the reconnection over IP?

Is it this timer you are thinking of? https://github.com/nrfconnect/sdk-nrf/blob/master/samples/nrf9160/lte_ble_gateway/src/main.c#L42-L45

The sample has a retry in the case that the initial connect() doesn't successfully run, where it tries x amount of seconds later.

 

Kind regards,

Håkon

[Marshed]

Hi,

Håkon Alseth said:

Are you referring to the LTE link itself, or the reconnection over IP?

LTE link itself

Håkon Alseth said:

Is it this timer you are thinking of? https://github.com/nrfconnect/sdk-nrf/blob/master/samples/nrf9160/lte_ble_gateway/src/main.c#L42-L45

No, this is fixed. 

with LTE link itself it tries to reconnect after 30 seconds, 60 seconds, 90 seconds, 1890 seconds, 3690 seconds, ..... Do you know where these variables are coming from?

Regards

Marshed 

[Håkon Alseth]

Hi,

 

There is a fallback option in the lte_lc driver:

https://github.com/nrfconnect/sdk-nrf/blob/v1.2.0/lib/lte_link_control/Kconfig#L147-L163

However, the interval should be 600 seconds by default. Is this what might be running in the background on your end?

 

Kind regards,

Håkon

[Marshed]

this is not the one either, this is fixed and it is for changing frequency. 

[Håkon Alseth]

Could you share the debug print?

[Marshed]

I don't think debug print will be much help here. 

Basically, if you remove a simcard from nordic thingy 91 and wait for disconnection. 

1. If you put back the simcard before 30s second from disconnection the network will be restored at 30s from disconnection 
2. If you put back the simcard between 30s and 60s from disconnection, the network will be restored at 60s after disconnection
3. if you put back the simcard between 60s and 90s from disconnection, the network will be restored at 90s after disconnection
4. if you put back the simcard between 90s and half and hour, the network will be restored at1890s after disconnection
5. if you put back the simcard beweeen 32 minutes and one hour, the network will be restored after 3690s after disconnection
6. ...........................................................

this has led me to conclude that reconnection attempt of LTE only occurs at these given times. Now the question still remains, if we can change these values or not?