Starting modem tracing

Complete the following steps:

1. Make sure you have configured application for tracing.

2. Identify the device's serial port for tracing by listing the devices with the modem device trait:

   nrfutil device list --traits modem
   

   Note

   When selecting a serial port for the trace, pick the serial port with the highest serial port number.

3. To trace continuously, run the nrfutil trace lte and specify the input serial port and the output file format:

   nrfutil trace lte --input-serialport <serial_port> --output-raw <file_name>
   

   For example, run the following command to save the input from the COM10 serial port to trace.raw:

   nrfutil trace lte --input-serialport COM10 --output-raw trace.raw
   

4. When done, stop tracing by pressing CTRL-C. The binary trace file is created in the current directory unless a different path is specified. You can view the file size in bytes while the trace is running.

The raw binary output file contains all traffic to and from the modem. Raw binary files are primarily used as an attachment when assistance is needed from Nordic Semiconductor support. Some of the traffic is proprietary to Nordic Semiconductor and not publicly available.