diff --git a/app/src/main/java/xyz/mtfos/btdemo/MainActivity.kt b/app/src/main/java/xyz/mtfos/btdemo/MainActivity.kt
index 1ae0539..ef3b71b 100644
--- a/app/src/main/java/xyz/mtfos/btdemo/MainActivity.kt
+++ b/app/src/main/java/xyz/mtfos/btdemo/MainActivity.kt
@@ -34,7 +34,7 @@ class MainActivity : Activity() {
         connectBtn.isEnabled = true
         disconnectBtn.isEnabled = false
 
-        ble = PrinterBle(this@MainActivity, "43:43:A1:12:1F:AC", "dd535b71-8f05-4e30-beb0-6fa7ea3dfc3e", "00000002-8f05-4e30-beb0-6fa7ea3dfc3e")
+        ble = PrinterBle(this@MainActivity, "43:43:A1:12:1F:AC", "dd535b71-8f05-4e30-beb0-6fa7ea3dfc3e", "00000001-8f05-4e30-beb0-6fa7ea3dfc3e")
 
         ble?.setOnStateChangeListener {
             System.out.println("Now State is >>>> " + it)