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$ stop flimflam
$ stop cromo
$ /usr/local/lib/flimflam/test/veth setup pseudomodem0 172.16.1
$ /usr/local/lib/flimflam/test/fake-gsm-modem -c tmobile --shill
$ start flimflam

T-Mobile should now appear as a connectable network in the 'Internet Connection' Settings UI. Furthermore, running 'modem status' in crosh should display information on TestModem.

Once done with the tests, run the following for cleanup:

$ stop flimflam
$ # kill the fake-gsm-modem process
$ /usr/local/lib/flimflam/test/veth teardown pseudomodem0
$ start cromo
$ start flimflam

shill will now interact with cromo. Bear in mind that, as of the writing of this entry, the shill daemon is still referred to as flimflam, which is why we call start flimflam and not start shill. This will be changed in the future.

The above steps apply to Chromebooks using a Gobi modem. For any other modem, replace cromo with the correct modem manager.