Reduce memory usage

iot/main/gps.cpp

@@ -12,7 +12,7 @@ void gps_begin() {
 }
 
 void gps_fetch() {
-	Serial.print("[gps] Getting location: ");
+	Serial.print(F("[gps] Getting location: "));
 	uint32_t ms_last_update = millis();
 	// We WILL discover our location - if it's the last thing we do!
 	while(true) {
@@ -40,7 +40,7 @@ void gps_fetch() {
 		}
 		
 		// Hooray!
-		Serial.println("ok");
+		Serial.println(F("ok"));
 		return;
 	}
 }

iot/main/main.ino

@@ -15,7 +15,7 @@
 
 void setup() {
 	Serial.begin(BAUD_PC);
-	Serial.println("[main] Beginning collection sequence.");
+	Serial.println(F("[main] Beginning collection sequence."));
 	
 	random_begin();
 	
@@ -27,11 +27,11 @@ void setup() {
 	TinyGPSPlus gps_data = gps_info();
 	gps_end();
 	
-	Serial.print("[main] Location: ("); Serial.print(gps_data.location.lat()); Serial.print(", "); Serial.print(gps_data.location.lng()); Serial.println(")");
+	Serial.print(F("[main] Location: (")); Serial.print(gps_data.location.lat()); Serial.print(F(", ")); Serial.print(gps_data.location.lng()); Serial.println(F(")"));
 	
 	uint32_t id = random_get();
 	
-	Serial.print("[main] id: ");
+	Serial.print(F("[main] id: "));
 	Serial.println(id);
 	
 	// Activate microSD card breakout board on the SPI bus

iot/main/power.cpp

@@ -2,19 +2,20 @@
 
 #include "settings.h"
 
-
+/*
 void power_gps_wakeup() {
-	Serial.println("Warn: GPS wakeup isn't implemented yet.");
+	Serial.println(F("Warn: GPS wakeup isn't implemented yet."));
 }
 
 void power_gps_standby() {
-	Serial.println("Warn: GPS standby isn't implemented yet.");
+	Serial.println(F("Warn: GPS standby isn't implemented yet."));
 }
+*/
 
 void power_off() {
-	Serial.println(F("[power] Beginning shutdown sequence"));
+	Serial.println(F("[power] Shutting down"));
-	Serial.println(F("[power] Switching GPS module to standby"));
+	// Serial.println(F("[power] Switching GPS module to standby"));
-	power_gps_standby();
+	// power_gps_standby();
 	
 	Serial.println(F("[power] Signalling TPL5111"));
 	pinMode(PIN_TPL_DONE, OUTPUT);

iot/main/power.h

@@ -2,11 +2,11 @@
 /**
  * Wakes the GPS module up from standby.
  */
-void power_gps_wakeup();
+// void power_gps_wakeup();
 /**
  * Puts the GPS module into standby.
  */
-void power_gps_standby();
+// void power_gps_standby();
 
 /**
  * Signals that our work is complete and that we can turn off now to the