FOTA update for multiple things on AWS got errno 116

[Waqar Ahmed]

Hi,

I am trying to update firmware of multiple things on AWS .during upgradation  I got error  in download thread block  Error in recv(),errno 116 and download client error. i got error on one of the device randomly. 

I am using nrf910 and nRFConnect SDK 1.5.0

log file is attached2021-11-22T09_46_42.119Z-log.txt

[Waqar Ahmed]

I found this error described as connection timeout error 
error_cause = ETIMEDOUT; error code 116

[Waqar Ahmed]

how to resolve this error ?

[Didrik Rokhaug]

Hi,

NB-IoT isn't very optimized for TCP traffic, which can become especially apparent when downloading a large amount of data, such as during FOTA updates.

But without a modem trace, it is hard to say exactly what is happening.

However, there are a few things you can try to make it more stable:

1. You can reduce the fragment size that is downloaded for each request, by setting CONFIG_DOWNLOAD_CLIENT_HTTP_FRAG_SIZE_<size>, where <size> can be 2048 (default), 1024, 512, 256 or 128

2. Increase the socket timeout by setting CONFIG_DOWNLOAD_CLIENT_TCP_SOCK_TIMEO_MS. The default is 30000 (milliseconds), and it can be increased to 60000

3. Increase the number of retries by setting CONFIG_FOTA_SOCKET_RETRIES, the default is 2.

Best regards,

Didrik