Add system state check. NVM loadSettings doesn't catch all EEPROM movement errors.

Author: nseidle

Firmware/RTK_Surveyor/Begin.ino

@@ -475,12 +475,25 @@ void beginSystemState()
   {
     systemState = settings.lastState; //Return to system state previous to power down.
 
+    if (systemState > STATE_SHUTDOWN)
+    {
+      Serial.println("Unknown state - factory reset");
+      factoryReset();
+    }
+
     setupBtn = new Button(pin_setupButton); //Create the button in memory
     powerBtn = new Button(pin_powerSenseAndControl); //Create the button in memory
   }
   else if (productVariant == RTK_FACET)
   {
     systemState = settings.lastState; //Return to system state previous to power down.
+
+    if (systemState > STATE_SHUTDOWN)
+    {
+      Serial.println("Unknown state - factory reset");
+      factoryReset();
+    }
+
     if (systemState == STATE_ROVER_NOT_STARTED)
       firstRoverStart = true; //Allow user to enter test screen during first rover start