Engineers at Golioth investigated connectivity issues with nRF9160 cellular modems, revealing DNS resolution failures when using NB-IoT networks that don't properly implement extended Protocol Configuration Options (ePCO) as specified by 3GPP standards, highlighting broader issues with closed-source modems and opaque telecom infrastructure.

https://blog.golioth.io/the-miserable-state-of-modems-and-mobile-network-operators/

#cellularnetworking #iotsecurity #firmware #telecomstandards #debugging