Hi everybody,

I have been following this forum for quite a while now and it’s great to see how many designers are working with cellular IoT. We had in the past created some designs based on the PyCOM GPy as it was one of the only solutions that was small and fully certified. When the GPy became EOL we were left in the dark and took on the challenge to create a pin and software compatible upgrade. We have called our module Walter and it has the following functionality:

Ultra low 9.8uA deep sleep current in PSM mode Open source and software support for ESP-IDF, Arduino, Micropython and Toit LTE-M, NB-IoT (3GPP rel. 14) GNSS (GPS + GLONASS) WiFi and BLE CE, UKCA, FCC, IC and RCM certifications

I hope this might be of interest to you, please do not hesitate to ask questions. You can read everything on our Crowd Supply page: https://www.crowdsupply.com/dptechnics/walter

Kind regards,
Daan

Yes, the SIM cards that we as IoT Creators send out are always activated when you get them delivered.
And our SIM can connect to the 4G network using our publick APN: m2m.public.nl
You can check our “roaming” page to read about operators and bands that you need for LTE-M at your location, please note that LTE-M is not necessarily available everywhere where you’ve got 4G coverage.
If all this seems to be fine on your end and you still can’t connect please tell us the details where you got stuck. (AT commands and module logs)

@inka-O internet.telekom is for smartphones. it won’t work for NB-IoT and the SIM cards are not allowed to use it I believe.

For NB-IoT we have an UDP adapter. So with NB-IoT you’ll need to use APN cdp.iot.t-mobile.nl which will allow you to send device data to 172.27.131.100.

To retrieve the device data in your back-end/cloud server/iot platform, you’ll need to create an HTTP integration.

If you use the sim-card for LTE-M or 2G, you’ll need another APN: m2m.public.nl. By doing this, the device will get a public IP address just like any other device on the open internet. This means that you can send device data directly to your own server while using LTE-M or 2G.

Hope this helps!

Updated 24.08.2020.