1 files changed, 4 insertions, 4 deletions
diff --git a/index.js b/index.js
index 017c4c8..d9ba827 100644
--- a/index.js
+++ b/index.js
@@ -49,8 +49,8 @@ async function connectDB() {
 
 connectDB();
 
-function generateSerialNumber() {
-    return `Jadupc${crypto.randomInt(100000, 999999)}`;
+function generateSerialNumber(mac) {
+    return `JPC${crypto.createHash('sha3-224').update(mac).digest('hex').toUpperCase().substring(0, 6)}`;
 }
 
 app.post('/upload', async (req, res) => {
@@ -67,10 +67,10 @@ app.post('/upload', async (req, res) => {
         const existingDevice = await collection.findOne({ mac });
   
         if (existingDevice) {
-            return res.status(400).send('Device with the same MAC address is already registered');
+            return res.status(400).send(`Device with the same MAC address is already registered, ${existingDevice.serialNumber}`);
         }
 
-        const serialNumber = generateSerialNumber();
+        const serialNumber = generateSerialNumber(mac);
   
         const newItem = {
             serialNumber,