Congratulations on the clear directions and smooth process, everything worked end-to-end within a few minutes!
Now for the real work: how can I receive the messages without using the AllThingsTalk dashboard? Is there a mqtt interface, http post, or other API to directly connect the device to my application?
OceanConnect (T-Mobile) is not (yet) a platform where we can manage the settings per device.
We have choosen ATT to land your data in a dashboard where you can store and display your data in a nice way.
And if you want you can get the data from ATT and forward it to your own server.
For those interested: I have written a How-To on how to use the All Things Talk MQTT API to directly integrate with the NB-IoT datafeed: https://premium.nl/blogs/2725/ Herbert