Add logNMEA and an example

src/SparkFun_u-blox_GNSS_Arduino_Library.cpp

@@ -1259,6 +1259,10 @@ void SFE_UBLOX_GNSS::processNMEA(char incoming)
   //If user has assigned an output port then pipe the characters there
   if (_nmeaOutputPort != NULL)
     _nmeaOutputPort->write(incoming); //Echo this byte to the serial port
+
+  //If _logNMEA is true, attempt to store incoming in the file buffer
+  if (_logNMEA)
+    storeFileBytes((uint8_t *)&incoming, 1);
 }
 
 //We need to be able to identify an RTCM packet and then the length
@@ -9073,6 +9077,14 @@ void SFE_UBLOX_GNSS::logHNRPVT(boolean enabled)
   packetUBXHNRPVT->automaticFlags.flags.bits.addToFileBuffer = (uint8_t)enabled;
 }
 
+// ***** Helper Functions for NMEA Logging
+
+//Log NMEA data in file buffer - if it exists! User needs to call setFileBufferSize before .begin
+void SFE_UBLOX_GNSS::logNMEA(boolean enabled)
+{
+  _logNMEA = enabled;
+}
+
 // ***** CFG RATE Helper Functions
 
 //Set the rate at which the module will give us an updated navigation solution

src/SparkFun_u-blox_GNSS_Arduino_Library.h

@@ -928,6 +928,9 @@ public:
 	void flushHNRPVT(); //Mark all the data as read/stale
 	void logHNRPVT(boolean enabled = true); // Log data to file buffer
 
+	// Helper function for NMEA logging
+	void logNMEA(boolean enabled = true); // Log NMEA data to file buffer
+
 	// Helper functions for CFG RATE
 
 	boolean setNavigationFrequency(uint8_t navFreq, uint16_t maxWait = defaultMaxWait);	//Set the number of nav solutions sent per second
@@ -1183,6 +1186,8 @@ private:
 
 	boolean ubx7FcheckDisabled = false; // Flag to indicate if the "7F" check should be ignored in checkUbloxI2C
 
+	boolean _logNMEA = false; // Flag to indicate if NMEA data should be added to the file buffer
+
 	//The packet buffers
 	//These are pointed at from within the ubxPacket
 	uint8_t payloadAck[2];				  // Holds the requested ACK/NACK