lora_gateway
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Add optional command line argument for TTY device
The serial port "/dev/ttyAMA0" is not necessarily the correct TTY for the GPS device. Hence test_loragw_gps may attempt to access the wrong serial port for the GPS if it is hard-wired to this device file. This change allows optionally specifying a TTY device for test_loragw_gps.
Signed-off-by: Scott Wagner [email protected]