chore: upgrade StudioBridge v2.1.1 -> v2.1.2, add A1 fix guide and JAR auto-download

Launch-StudioBridge.bat

@@ -16,6 +16,30 @@ set "ROOTDIR=%~dp0"
 REM Set the path to the portable-dist folder
 set "PORTABLE=%ROOTDIR%portable-dist"
 
+REM ---------------------------------------------------------------------------
+REM JAR auto-download (StudioBridge 2.1.2)
+REM ---------------------------------------------------------------------------
+set "JAR_FILE=%PORTABLE%\StudioBridge-2.1.2.jar"
+set "JAR_URL=https://github.com/Rdiger-36/StudioBridge/releases/download/v.2.1.2/StudioBridge-2.1.2.jar"
+
+if not exist "%JAR_FILE%" (
+    echo [JAR] StudioBridge-2.1.2.jar not found.
+    echo [JAR] Downloading StudioBridge 2.1.2...
+    echo.
+    powershell -NoProfile -Command "Invoke-WebRequest -Uri '%JAR_URL%' -OutFile '%JAR_FILE%'" 2>nul
+    if not exist "%JAR_FILE%" (
+        echo ERROR: JAR download failed. Please check your internet connection.
+        echo You can also manually download StudioBridge-2.1.2.jar from:
+        echo   https://github.com/Rdiger-36/StudioBridge/releases/tag/v.2.1.2
+        echo and place it in: %PORTABLE%
+        pause
+        exit /b 1
+    )
+    echo [JAR] StudioBridge 2.1.2 downloaded successfully.
+    echo.
+)
+REM ---------------------------------------------------------------------------
+
 REM ---------------------------------------------------------------------------
 REM JRE auto-download (Temurin 21 LTS for Windows x64)
 REM ---------------------------------------------------------------------------

README.md

@@ -1,6 +1,6 @@
 # StudioBridge
 
-> **This portable distribution bundles StudioBridge v2.1.1** — the latest release from [Rdiger-36/StudioBridge](https://github.com/Rdiger-36/StudioBridge).
+> **This portable distribution bundles StudioBridge v2.1.2** — the latest release from [Rdiger-36/StudioBridge](https://github.com/Rdiger-36/StudioBridge).
 
 With StudioBridge it is possible to make Bambu Lab 3D Printers visible in Bambu Studio or Orca Slicer, that cannot be automatically added by them.
 It is also possible to connect printers from other subnets or from accessible external networks (e.g. via VPN) or in your normal home network.
@@ -23,11 +23,12 @@ Successfully tested on:
 - Linux Ubuntu 25.10 ARM and x86
 - MacOS Intel and M-Series
 
-# Supported Printers (v2.1.1)
+# Supported Printers (v2.1.2)
 | Display Name | Model Code |
 |---|---|
 | A1 | N2S |
 | A1 Mini | N1 |
+| A2L | N9 |
 | P1P | C11 |
 | P1S | C12 |
 | P2S | N7 |
@@ -89,8 +90,8 @@ StudioBridge.jar is built in Java, so a Java Runtime Environment (JRE) is requir
 2. Verify with `java -version`.
 
 **Running the GUI:**
-1. Download `StudioBridge-2.1.1.jar` from the [GitHub releases page](https://github.com/Rdiger-36/StudioBridge/releases/tag/v.2.1.1).
+2. Download `StudioBridge-2.1.2.jar` from the [GitHub releases page](https://github.com/Rdiger-36/StudioBridge/releases/tag/v.2.1.2).
-2. Double-click the `.jar` to launch, or run: `java -jar StudioBridge-2.1.1.jar`
+2. Double-click the `.jar` to launch, or run: `java -jar StudioBridge-2.1.2.jar`
 
 # FAQ
 
@@ -103,6 +104,17 @@ xattr -dr com.apple.quarantine /Applications/StudioBridge.app
 **Q: My Printer does not connect to Bambu Studio (Error Code -1)**
 A: Check that all printer information (IP, serial number, model) is correct. Try disabling/enabling Only-LAN-Mode. You can also try disconnecting the printer from the cloud and reconnecting it ([Issue #12](https://github.com/Rdiger-36/StudioBridge/issues/12)).
 
+**Q: My A1 printer is visible in Bambu Studio but I cannot send files to print**
+A: StudioBridge only handles UDP discovery — the actual print job transfer is done entirely by Bambu Studio over MQTT (port 8883). If the printer appears but printing fails, follow these steps:
+1. On the A1 printer screen go to **Settings → Network** and enable **Only LAN Mode**.
+2. In Bambu Studio, open the **Devices** tab, right-click the A1 and choose **Log out**, then reconnect using the **LAN Access Code** shown on the printer screen under **Settings → Network → LAN Access Code**.
+3. Make sure Windows Firewall is not blocking Bambu Studio on TCP port **8883**.
+4. If the printer was connected to the Bambu cloud for a long time, log it out of the cloud and log back in — this refreshes the internal credentials ([Issue #12](https://github.com/Rdiger-36/StudioBridge/issues/12)).
+5. Try running StudioBridge with the `--direct` flag to send the discovery packet directly to Bambu Studio instead of broadcast:
+   ```
+   .\StudioBridge.bat --direct
+   ```
+
 ---
 
 # Portable Launcher for StudioBridge

portable-dist/StudioBridge.bat

@@ -1,3 +1,3 @@
 @echo off
 set "JAVA_HOME=%~dp0jre"
-"%JAVA_HOME%\bin\java.exe" -jar "%~dp0StudioBridge-2.1.1.jar" %*
+"%JAVA_HOME%\bin\java.exe" -jar "%~dp0StudioBridge-2.1.2.jar" %*