Fix cardinal points in location by gps for sim7600

[Juxn3]

In the sim7600 modem, when the location is being obtained recurrently from the second iteration, it does not process the cardinal points correctly.

#566

#641

[imorda]

You might want to check the #736. There is a trouble in gps parser so it expects some extra delimeters not compliant with the protocol, that might be the actual reason for the inconsistency you experience here

[jorisvervuurt]

You might want to check the #736. There is a trouble in gps parser so it expects some extra delimeters not compliant with the protocol, that might be the actual reason for the inconsistency you experience here

I have just confirmed that this in fact is not related to #736. stream.read() somehow does not return the actual character. The solution to use stream.readStringUntil(',').charAt(0) does fix the problem.