+ string SystemPath [readonly, optional]
+ String giving a consistent hardware path for the modem
+ device. It will not change in case of reboot of modem
+ or ofono.
Given that many modems are USB devices, I don't think you can actually
promise this. I can envision a (slightly pathological) hardware design
whereby the presence or absence of an _external_ device at startup may
change the device enumeration order and thereby the syspath...
Right, this can depend on the kernel version also. I wouldn't claim any
guarantees at the D-Bus API level as it is outside our control.
If someone chooses to use it as a consistent path, then they do it at
their own risk.
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