diff --git a/software/app.php b/software/app.php
index 2db1cc9..b0fcf94 100644
--- a/software/app.php
+++ b/software/app.php
@@ -2,10 +2,10 @@
 
 require_once('debug.php');
 require_once('router.php');
-$router = new Router(new Request);
-
 require_once('database/sqlite.php');
-$db = new DB();
+
+$router = new Router(new Request);
+$db     = new DB();
 
 $router->get('/', function($req) {
     echo "Nothing to see here!\n";
diff --git a/software/database/sqlite.php b/software/database/sqlite.php
index 8a9f8f7..fcf0229 100644
--- a/software/database/sqlite.php
+++ b/software/database/sqlite.php
@@ -3,7 +3,7 @@
 interface DBIface
 {
     public function __construct();
-    public function addDevice(DeviceData $deviceData);
+    public function addDevice($deviceData);
     public function getDevices();
     public function getDeviceById($id);
     public function updateDevice($id, $deviceData);
@@ -39,17 +39,17 @@ class DB implements DBIface {
                 id INTEGER PRIMARY KEY,
                 mac_address TEXT NOT NULL,
                 ip_address TEXT NOT NULL,
-                seen_ip_address TEXT NOT NULL,
-                firmware_version TEXT NOT NULL,
+                ip_address_seen TEXT NOT NULL,
+                firmware_version INTEGER NOT NULL,
                 temperature_offset INTEGER DEFAULT 0,
                 humidity_offset INTEGER DEFAULT 0,
-                last_updated TEXT DEFAULT CURRENT_TIMESTAMP,
                 last_seen TEXT DEFAULT CURRENT_TIMESTAMP
             );
             CREATE TABLE IF NOT EXISTS readings (
                 dev_id INTEGER PRIMARY KEY,
                 temperature INTEGER NOT NULL,
                 humidity INTEGER NOT NULL,
+                updated_at TEXT DEFAULT CURRENT_TIMESTAMP
                 FOREIGN KEY(dev_id) REFERENCES devices(id) ON UPDATE CASCADE ON DELETE CASCADE
             );
 
@@ -64,8 +64,8 @@ class DB implements DBIface {
 
     public function addDevice($deviceData) {
         $sql = "
-            INSERT INTO devices (mac_address, ip_address, seen_ip_address, firmware_version, temperature_offset, humidity_offset, last_updated, last_seen)
-            VALUES (:mac_address, :ip_address, seen_ip_address, :firmware_version, :temperature_offset, :humidity_offset, :last_updated, :last_seen)
+            INSERT INTO devices (mac_address, ip_address, ip_address_seen, firmware_version, temperature_offset, humidity_offset, last_seen)
+            VALUES (:mac_address, :ip_address, :ip_address_seen, :firmware_version, :temperature_offset, :humidity_offset, :last_seen)
         ";
         try {
             $stmt = $this->pdo->prepare($sql);
@@ -103,11 +103,10 @@ class DB implements DBIface {
             SET id = :id,
                 mac_address = :mac_address,
                 ip_address = :ip_address,
-                seen_ip_address = :seen_ip_address,
+                ip_address_seen = :ip_address_seen,
                 firmware_version = :firmware_version,
                 temperature_offset = :temperature_offset,
                 humidity_offset = :humidity_offset,
-                last_updated = :last_updated,
                 last_seen = :last_seen
             WHERE id = :id
         ";
@@ -169,7 +168,7 @@ $newDevice = [
     'id' => 'device123',
     'mac_address' => '00:1B:44:11:3A:B7',
     'ip_address' => '192.168.1.2',
-    'seen_ip_address' => '212.71.123.123',
+    'ip_address_seen' => '212.71.123.123',
     'firmware_version' => '1.0.1',
     'temperature_offset' => 0,
     'humidity_offset' => 0,
diff --git a/software/device-api.php b/software/device-api.php
index 1fa6a97..4c44e66 100644
--- a/software/device-api.php
+++ b/software/device-api.php
@@ -1,5 +1,6 @@
 <?php
 
+
 function valid($msg, $key, $regex) {
     //if(!isset($msg[$key])) {
     /*
@@ -19,12 +20,12 @@ function valid($msg, $key, $regex) {
 }
 
 // Update device configuration
-$router->post('/api/config', function($req) {
+$router->post('/api/config', function($req) use($db) {
     $msg = $req->getJSONBody();
 
     if(!valid($msg,'mac_address',        '/^[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]:[0-9a-f][0-9a-f]$/i') ||
        !valid($msg,'ip_address',         '/^[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*$/i') ||
-       !valid($msg,'firmware_version',   '/^[0-9]+\.[0-9]+$/') ||
+       !valid($msg,'firmware_version',   '/^[0-9]+$/') ||
        !valid($msg,'temperature_offset', '/^[0-9]+\.*[0-9]*$/') ||
        !valid($msg,'humidity_offset',    '/^[0-9]+\.*[0-9]*$/')
     ) {
@@ -35,6 +36,23 @@ $router->post('/api/config', function($req) {
 
     // If device is already registered (it sends an ID) then figure out what values changed and send those back for the device to re-configure itself.
     else if(valid($msg,'id','/^[0-9]+$/')) {
+        $deviceData = $db->getDeviceByID($msg['id']);
+        // If device is not registered yet...
+        if($deviceData == null) {
+            echo '{"error_message": "Device by that ID not found."}';
+            http_response_code(400);
+            return;
+        }
+        // Return stored device data so device may update its settings.
+        echo json_encode($deviceData);
+        // Update database entry based on post data received.
+        $db->updateDevice([
+            'mac_address'        => $msg['mac_address'],
+            'ip_address'         => $msg['ip_address'],
+            'ip_address_seen'    => $_SERVER['REMOTE_ADDR'],
+            'firmware_version'   => $msg['firmware_version'],
+            'last_seen'          => date('Y-m-d H:i:s')
+        ]);
         http_response_code(200);
         return;
     }
@@ -42,14 +60,13 @@ $router->post('/api/config', function($req) {
     // All fields are set and no ID was given. Register new device and return new ID...
     else {
         $config = [
-            'mac_address' => $msg['mac_address'],
-            'ip_address' => $msg['ip_address'],
-            'seen_ip_address' => $_SERVER['REMOTE_ADDR'],
-            'firmware_version' => $msg['firmware_version'],
+            'mac_address'        => $msg['mac_address'],
+            'ip_address'         => $msg['ip_address'],
+            'ip_address_seen'    => $_SERVER['REMOTE_ADDR'],
+            'firmware_version'   => $msg['firmware_version'],
             'temperature_offset' => $msg['temperature_offset'],
-            'humidity_offset' => $msg['humidity_offset'],
-            'last_updated' => date('Y-m-d H:i:s'),
-            'last_seen' => date('Y-m-d H:i:s')
+            'humidity_offset'    => $msg['humidity_offset'],
+            'last_seen'          => date('Y-m-d H:i:s')
         ];
         $deviceID = $db->addDevice($config);
         echo json_encode(['deviceID' => $deviceID]);