diff --git a/android/app/src/main/java/nl/eddydevink/sylda/BleStatus.kt b/android/app/src/main/java/nl/eddydevink/sylda/BleStatus.kt
index 110aac8..ee44abd 100644
--- a/android/app/src/main/java/nl/eddydevink/sylda/BleStatus.kt
+++ b/android/app/src/main/java/nl/eddydevink/sylda/BleStatus.kt
@@ -18,4 +18,5 @@ enum class BleStatus {
 
 interface BleCallbacks {
     fun onStatusChanged(status: BleStatus)
+    fun onFirmwareVersion(espVersion: String, appVersion: String)
 }