Porting MKRGSM to Leonardo

Note: This problem may be related to the open issue https://github.com/arduino-libraries/MKRGSM/issues/160

I have some older Leonardo boards and a slightly different uBlox modem, so I wanted to port MKRGSM library. It is based off the now deprecated GSM library which used the SoftwareSerial library, causing other headaches.

If I tweak modem.cpp in the library to this: ModemClass MODEM(Serial1, 115200, 4, 7);

Similar to the other issue I get this compile error:

WARNING: library MKRGSM claims to run on samd architecture(s) and may be incompatible with your current board which runs on avr architecture(s).
In file included from \Arduino\libraries\MKRGSM\src/GSMVoiceCall.h:23:0,
                 from \Arduino\libraries\MKRGSM\src/MKRGSM.h:24,
                 from \AppData\Local\Temp\.arduinoIDE-unsaved2023123-26736-sy7p7s.4vyce\TestModem\TestModem.ino:18:
\Arduino\libraries\MKRGSM\src/Modem.h:35:18: error: expected ')' before '&' token
   ModemClass(Uart& uart, unsigned long baud, int resetPin, int dtrPin);
                  ^
\Arduino\libraries\MKRGSM\src/Modem.h:71:3: error: 'Uart' does not name a type; did you mean 'sqrt'?
   Uart* _uart;
   ^~~~
   sqrt

exit status 1

I am afraid my C++ skillz are not quite up to figuring out why that constructor hates me for passing in Serial1 instead of SerialGSM

Any help is greatly appreciated!

arduino-libraries / MKRGSM

Porting MKRGSM to Leonardo #161