diff --git a/java_console/io/src/main/java/com/rusefi/binaryprotocol/IncomingDataBuffer.java b/java_console/io/src/main/java/com/rusefi/binaryprotocol/IncomingDataBuffer.java
index c56a3b90c7..f19597ed30 100644
--- a/java_console/io/src/main/java/com/rusefi/binaryprotocol/IncomingDataBuffer.java
+++ b/java_console/io/src/main/java/com/rusefi/binaryprotocol/IncomingDataBuffer.java
@@ -2,6 +2,7 @@ package com.rusefi.binaryprotocol;
 
 import com.devexperts.logging.Logging;
 import com.rusefi.Timeouts;
+import com.rusefi.binaryprotocol.test.Bug3923;
 import com.rusefi.io.IoStream;
 import com.rusefi.io.serial.AbstractIoStream;
 import etch.util.CircularByteBuffer;
@@ -98,7 +99,7 @@ public class IncomingDataBuffer {
             cbb.put(freshData);
             cbb.notifyAll();
         }
-        if (log.debugEnabled())
+        if (log.debugEnabled() || Bug3923.obscene)
             log.debug(freshData.length + " byte(s) arrived, total " + cbb.length());
     }
 
diff --git a/java_console/io/src/main/java/com/rusefi/binaryprotocol/test/Bug3923.java b/java_console/io/src/main/java/com/rusefi/binaryprotocol/test/Bug3923.java
new file mode 100644
index 0000000000..0d774e1c75
--- /dev/null
+++ b/java_console/io/src/main/java/com/rusefi/binaryprotocol/test/Bug3923.java
@@ -0,0 +1,5 @@
+package com.rusefi.binaryprotocol.test;
+
+public class Bug3923 {
+    public static final boolean obscene = false;
+}
diff --git a/java_console/io/src/main/java/com/rusefi/io/serial/SerialIoStream.java b/java_console/io/src/main/java/com/rusefi/io/serial/SerialIoStream.java
index ef90f77708..5e42141124 100644
--- a/java_console/io/src/main/java/com/rusefi/io/serial/SerialIoStream.java
+++ b/java_console/io/src/main/java/com/rusefi/io/serial/SerialIoStream.java
@@ -6,6 +6,7 @@ import com.fazecast.jSerialComm.SerialPortDataListener;
 import com.fazecast.jSerialComm.SerialPortEvent;
 import com.opensr5.io.DataListener;
 import com.rusefi.binaryprotocol.IncomingDataBuffer;
+import com.rusefi.binaryprotocol.test.Bug3923;
 import com.rusefi.io.IoStream;
 import org.jetbrains.annotations.NotNull;
 
@@ -76,6 +77,8 @@ public class SerialIoStream extends AbstractIoStream {
 
             @Override
             public void serialEvent(SerialPortEvent event) {
+                if (Bug3923.obscene)
+                    System.out.println("serialEvent " + event);
                 if (event.getEventType() != SerialPort.LISTENING_EVENT_DATA_AVAILABLE)
                     return;
                 if (isFirstEvent) {
@@ -84,6 +87,8 @@ public class SerialIoStream extends AbstractIoStream {
                     isFirstEvent = false;
                 }
                 int bytesAvailable = sp.bytesAvailable();
+                if (Bug3923.obscene)
+                    log.info("serialEvent bytesAvailable " + bytesAvailable);
                 if (bytesAvailable <= 0)
                     return; // sometimes negative value is returned at least on Mac
                 byte[] newData = new byte[bytesAvailable];