Hi, I want to send data between two nRF9160 test boards. What is the easiest solution? What boards to use? What firmware/software to load?

[bjorn--]

We want to evaluate nRF9160 both with use of LTE-M and NB-IoT for transfer of compressed pictures and smaller data packages. The evaluation will be performed with one of the available test boards. Current consumption will be measured by oscilloscope. 

[Didrik Rokhaug]

Hi.

We do not have an example of how to send messages "directly" between two nRF9160s.

However, it should not be worse than listening on a port on one device and connect to that port on the other with TCP or UDP. The biggest problem will probably be to find the IP of the other device.

A very basic (unofficial) sample on how to send UDP data can be found here: https://github.com/Rallare/fw-nrfconnect-nrf/tree/nrf9160_samples/samples/nrf9160/ntp

For smaller data packages, MQTT might be a good fit. As long as one device publishes on a topic the other subscribes to, the other device will get the message. The downside with MQTT is that it requires a broker. For demo-purposes, an open one such as mqtt.eclipse.org might suffice.

You should also check out the http_download sample. It is meant to demonstrate how to download FOTA images, but it might provide a starting point on how to download larger pieces of data.

[bjorn--]

Hi and thanks a lot. The most urgent end is the upload end. What is the most suitable demo hardware to use? 

[Didrik Rokhaug]

I would use an nRF91 DK as it has a debugger, and is, therefore, easier to work with than the Thingy:91.