Make SNR in GSV messages optional

LakeMaps / boat

Lake Maps' boat control software

Open Software License 3.0

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Closed whymarrh closed 7 years ago

whymarrh commented 7 years ago

This PR updates the GPS parser to handle GSV messages missing SNR values.

An example sentence:

$GPGSV,3,1,12,08,78,253,,27,60,055,21,07,56,280,,16,34,098,23*75

whymarrh commented 7 years ago

Page 21 of the datasheet for the GPS notes that the SNR may be "null when not tracking"