In an
earlier test of the AIS NB-IoT Arduino shield, I touched on the fact that the AIS 923MHz NB-IoT network tested illustrated "not the best reliability" due to spotty 923MHz cell tower penetration / coverage.
However, on the ocean side of my condo, I have improved this reliability issue a few DB (my RF power meter is not very accurate, sorry) with this antenna:
More importantly than potential antenna gain, the 923MHz NB-IoT signal is considerably more reliable after placing the antenna at the window and off my desktop (which is about 3 to 4 meters away from the window).
In addition, I have the Arduino sketch sending the message to a remote Linux server via BLE and the NB-IoT network and will post the code / sketch after I add a mini-app to get some server stats like the server load averages back to the iPhone. Just need to add a few lines of code to my test Python UDP server code and change the sketch to receive the result and display it on the iPhone.
So far, it's pretty simple (after working out the conflict between serial comm pins last yesterday).
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