Sniffing network packets from a cellular modem is actually pretty easy. It only seems daunting because at first glance you're left wondering how to acquire the packets. Nordic's nRF91 modems have a trace capability that can be used to pipe packets from the device into Wireshark over a USB connection. Here's how to use it.
Wireshark is an open-source network monitoring tool that also works to troubleshoot Thread networks. Golioth shows you how to get started using the tool and decoding encrypted wireless mesh packets when working with Thread or OpenThread.
