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The manual for the TNC-Pi references some tests using ax25-apps. The install process also installed these tools as well as set up the port based on your JNOS answers.
If you wish to run these tests, you must first shut down JNOS as at has control of the TNC. Log on as root using ssh (or open a command window if you still have a television attached and set root), then shut down JNOS as in Section 8, “Controlling JNOS from the command line”:
systemctl stop getty@tty6.service
Instead of doing the kissattach, the install provided a script, ax25-start with the parameters already set based on your answers during configuration.
You may now use the axlisten command as outlined in the TNC-Pi manual, and the axcall command. The axcall requires two parameters, the name of the interfacs and the SSID of the station to call. The interface name is the frequency, following the Michigan convention. So, for example, if you wanted to call hamgate.washtenaw (assuming you are within range) you would say something like:
axcall 145.76 WB8TKL-3
When ax25 has been started, most Internet tools can be used over radio, providing, of course, that there is a server on the other end of the radio circuit. One simple application is finger which is used to get information about users, but on a JNOS system, there are a number of special "users" which tell us information about JNOS. For example, if we wanted to see who has logged into HamGate.Washtenaw recently, we could say:
When we have completed out test, we can stop the AX.25 subsytem with:
JNOS can then be rstarted using the method outlined in Section 8, “Controlling JNOS from the command line”
systemctl start getty@tty6.service
Or, we could simply reboot:
shutdown -r now