Write Arduino GPS test sketch

.gitmodules

@@ -7,3 +7,6 @@
 [submodule "iot/libraries/arduino-lmic"]
 	path = iot/libraries/arduino-lmic
 	url = https://github.com/mcci-catena/arduino-lmic.git
+[submodule "iot/libraries/TinyGPSPlus"]
+	path = iot/libraries/TinyGPSPlus
+	url = https://github.com/mikalhart/TinyGPSPlus.git

iot/GPSTest/GPSTest.ino

@@ -0,0 +1,84 @@
+#include <TinyGPS++.h>
+#include <SoftwareSerial.h>
+
+// NOTE: RX and TX must be swapped with respect to the pin definitions on the NE-6M itself.
+#define PIN_GPS_RX	4
+#define PIN_GPS_TX	3
+
+#define BAUD_PC 115200
+#define BAUD_GPS	9600
+
+TinyGPSPlus	gps;
+
+SoftwareSerial serial_gps(PIN_GPS_RX, PIN_GPS_TX);
+
+void setup();
+void loop();
+void gps_display();
+
+void setup() {
+	Serial.begin(BAUD_PC);
+	serial_gps.begin(BAUD_GPS);
+	
+	Serial.print("TinyGPS++ v");
+	Serial.print(TinyGPSPlus::libraryVersion());
+	Serial.println(" Test");
+}
+
+void loop() {
+	while(serial_gps.available() > 0) {
+		if(!gps.encode(serial_gps.read()))
+			continue;
+		
+		gps_display();
+	}
+	
+    if (millis() > 5000 && gps.charsProcessed() < 10) {
+        Serial.println(F("No GPS detected: check wiring."));
+        while(true);
+    }
+}
+
+void gps_display() {
+	if(!gps.location.isUpdated()) return;
+	// From the device example
+    Serial.print(F("Location: "));
+    if (gps.location.isValid()) {
+        Serial.print(gps.location.lat(), 6);
+        Serial.print(F(","));
+        Serial.print(gps.location.lng(), 6);
+        Serial.print(F(" "));
+    }
+    else
+        Serial.print(F("(invalid) "));
+
+    Serial.print(F("DateTime: "));
+    if (gps.date.isValid()) {
+        Serial.print(gps.date.month());
+        Serial.print(F("/"));
+        Serial.print(gps.date.day());
+        Serial.print(F("/"));
+        Serial.print(gps.date.year());
+    }
+    else
+        Serial.print(F("(invalid) "));
+
+    Serial.print(F(" "));
+    if (gps.time.isValid()) {
+        if (gps.time.hour() < 10) Serial.print(F("0"));
+        Serial.print(gps.time.hour());
+        Serial.print(F(":"));
+        if (gps.time.minute() < 10) Serial.print(F("0"));
+        Serial.print(gps.time.minute());
+        Serial.print(F(":"));
+        if (gps.time.second() < 10) Serial.print(F("0"));
+        Serial.print(gps.time.second());
+        Serial.print(F("."));
+        if (gps.time.centisecond() < 10) Serial.print(F("0"));
+        Serial.print(gps.time.centisecond());
+    }
+    else
+        Serial.print(F("(invalid)"));
+
+    Serial.println();
+}

iot/libraries/TinyGPSPlus

@@ -0,0 +1 @@
+Subproject commit b4c8e29d1def35806fb1fc75fe0013036843d643