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Zeeshan Ali Khan authored
Add a new class which is going to be responsible for dealing with ModemManager for us. This is so that: * We have ModemManager code isolated from rest of the code so its easy to add support for other backends (e.g ofono) in future. * We have only one entity dealing with modem. In the following patch(es), we'll drop GClueModemSource baseclass and, GClueModemGPS and GClue3G will just use GClueModem for talking to modem. * GClue3G can then derive from GClueWebSource instead and be more easily modified to submit cell tower data to Mozilla Location Service. * GClueModemGPS can be easily generalized so that it can be more easily modifed to talk to standalone GPS devices too in future (we'll probably want to change it's name to GClueGPS then).
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