diff --git a/src/WebSockets.h b/src/WebSockets.h
index c918c9f..0b26189 100644
--- a/src/WebSockets.h
+++ b/src/WebSockets.h
@@ -50,7 +50,10 @@
         DEBUG_ESP_PORT.flush();             \
     }
 #else
-// #define DEBUG_WEBSOCKETS(...) os_printf( __VA_ARGS__ )
+#ifdef DEBUG_PORT
+#define DEBUG_WEBSOCKETS(...) websocket_debug_printf(__VA_ARGS__)
+void websocket_debug_printf(const char * format, ...);
+#endif
 #endif
 #endif
 
diff --git a/src/debug.cpp b/src/debug.cpp
new file mode 100644
index 0000000..a4e6391
--- /dev/null
+++ b/src/debug.cpp
@@ -0,0 +1,32 @@
+
+#include "WebSockets.h"
+
+#include <stdarg.h>
+
+#ifdef DEBUG_PORT
+
+void websocket_debug_printf(const char * format, ...) {
+    va_list arg;
+    va_start(arg, format);
+    char temp[64];
+    char * buffer = temp;
+    size_t len    = vsnprintf(temp, sizeof(temp), format, arg);
+    va_end(arg);
+    if(len > sizeof(temp) - 1) {
+        buffer = new(std::nothrow) char[len + 1];
+        if(!buffer) {
+            return 0;
+        }
+        va_start(arg, format);
+        vsnprintf(buffer, len + 1, format, arg);
+        va_end(arg);
+    }
+    len = DEBUG_PORT.write((const uint8_t *)buffer, len);
+    if(buffer != temp) {
+        delete[] buffer;
+    }
+    DEBUG_PORT.flush();
+    return len;
+}
+
+#endif
\ No newline at end of file
diff --git a/travis/version.py b/travis/version.py
index 71454ab..441fd33 100755
--- a/travis/version.py
+++ b/travis/version.py
@@ -73,7 +73,7 @@ def get_library_json_version():
 
 def get_header_versions():
     data = {}
-    define = re.compile('^#define WEBSOCKETS_VERSION_?(.*) "?([0-9\.]*)"?$')
+    define = re.compile('^#define WEBSOCKETS_VERSION_?(.*) "?([0-9\\.]*)"?$')
     with open(f'{base_dir}/src/WebSocketsVersion.h', 'r') as f:
         for line in f:
             m = define.match(line)