diff --git a/.drone.yml b/.drone.yml
index bf7203a..981614c 100644
--- a/.drone.yml
+++ b/.drone.yml
@@ -7,6 +7,7 @@ steps:
   commands:
   - pip install platformio
   - pio run
+  - pio check --skip-packages
 - name: release
   image: plugins/gitea-release
   settings:
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
index 272828b..0f0d740 100644
--- a/.vscode/extensions.json
+++ b/.vscode/extensions.json
@@ -1,7 +1,7 @@
-{
-	// See http://go.microsoft.com/fwlink/?LinkId=827846
-	// for the documentation about the extensions.json format
-	"recommendations": [
-		"platformio.platformio-ide"
-	]
-}
\ No newline at end of file
+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ]
+}
diff --git a/include/config.h b/include/config.h
index 78413b6..3989213 100644
--- a/include/config.h
+++ b/include/config.h
@@ -10,11 +10,11 @@
 #define VERSION_BUILD           1
 
 
-#define VERSION_STRING STR(VERSION_MAJOR) "." STR(VERSION_MINOR) "." STR(VERSION_BUILD)
-#define VERSION_DATE  __DATE__
+#define VERSION_STRING          STR(VERSION_MAJOR) "." STR(VERSION_MINOR) "." STR(VERSION_BUILD)
+#define VERSION_DATE            __DATE__
 
 
-#define BAUDRATE        115200
-#define DISP_OFFSET_X   49
-#define DISP_OFFSET_Y   27
+#define BAUDRATE                115200
+#define DISP_OFFSET_X           49
+#define DISP_OFFSET_Y           27
 #endif /* CONFIG_H */
diff --git a/lib/CommandHandler/CommandHandler.cpp b/lib/CommandHandler/CommandHandler.cpp
index ff4b08f..02f6e54 100644
--- a/lib/CommandHandler/CommandHandler.cpp
+++ b/lib/CommandHandler/CommandHandler.cpp
@@ -8,7 +8,7 @@ CommandHandler::CommandHandler(DisplayProxy *display)
     this->display = display;
 }
 
-bool CommandHandler::parse(char *cmd)
+bool CommandHandler::parse(const char *cmd)
 {
     Serial.print("Handling: ");
     Serial.println(cmd);
diff --git a/lib/CommandHandler/CommandHandler.h b/lib/CommandHandler/CommandHandler.h
index 6a80813..c5d6ab4 100644
--- a/lib/CommandHandler/CommandHandler.h
+++ b/lib/CommandHandler/CommandHandler.h
@@ -5,8 +5,8 @@
 class CommandHandler
 {
 public:
-    CommandHandler(DisplayProxy *display);
-    bool parse(char *cmd);
+    explicit CommandHandler(DisplayProxy *display);
+    bool parse(const char *cmd);
 private:
     void debugWrite(int x, int y, const char *text);
     DisplayProxy *display;
diff --git a/lib/DisplayProxy/DisplayProxyMAX7456.cpp b/lib/DisplayProxy/DisplayProxyMAX7456.cpp
index a7ee5fd..4d869e3 100644
--- a/lib/DisplayProxy/DisplayProxyMAX7456.cpp
+++ b/lib/DisplayProxy/DisplayProxyMAX7456.cpp
@@ -3,22 +3,54 @@
 DisplayProxyMAX7456::DisplayProxyMAX7456(Max7456 *osd)
 {
     this->osd = osd;
+    this->osd->init(6);
+    clear();
+    this->osd->setBlinkParams(_8fields, _BT_3BT);
+
+    externalVideo(false);
+    onScreenDisplay(true);
 }
 
+/**
+ * Write a text string to the display at the given position
+ * @param x Position along the X axis
+ * @param y Position along the Y axis
+ * @param text The string to print
+ * @return Success or false
+ */
 bool DisplayProxyMAX7456::write(int x, int y, const char *text)
 {
     this->osd->print(text, x, y);
     return true;
 }
 
+/**
+ * Clear the entire screen
+ */
 bool DisplayProxyMAX7456::clear()
 {
     this->osd->clearScreen();
     return true;
 }
 
+/**
+ * Adjust the display offset.
+ * Since the signal is analog the characters might be rendered outside the display area
+ */
 bool DisplayProxyMAX7456::setOffset(int x, int y)
 {
     this->osd->setDisplayOffsets(x, y);
     return true;
+}
+
+bool DisplayProxyMAX7456::externalVideo(bool enabled)
+{
+    this->osd->activateExternalVideo(enabled);
+    return true;
+}
+
+bool DisplayProxyMAX7456::onScreenDisplay(bool enabled) 
+{
+    this->osd->activateOSD(enabled);
+    return true;
 }
\ No newline at end of file
diff --git a/lib/DisplayProxy/DisplayProxyMAX7456.h b/lib/DisplayProxy/DisplayProxyMAX7456.h
index e56abf8..44c3bff 100644
--- a/lib/DisplayProxy/DisplayProxyMAX7456.h
+++ b/lib/DisplayProxy/DisplayProxyMAX7456.h
@@ -7,11 +7,14 @@
 class DisplayProxyMAX7456 : public DisplayProxy
 {
 public:
-    DisplayProxyMAX7456(Max7456 *osd);
+    explicit DisplayProxyMAX7456(Max7456 *osd);
+
+    bool write(int x, int y, const char *text) override;
+    bool clear() override;
+    bool setOffset(int x, int y) override;
+    bool externalVideo(bool enabled);
+    bool onScreenDisplay(bool enabled);
 
-    bool write(int x, int y, const char *text);
-    bool clear() ;
-    bool setOffset(int x, int y);
 private:
     Max7456 *osd;
 };
diff --git a/src/main.cpp b/src/main.cpp
index b4cef01..6eb5c53 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -5,40 +5,10 @@
 #include "CommandHandler.h"
 #include "DisplayProxyMAX7456.h"
 #include "max7456.h"
+
 Max7456 osd;
-DisplayProxyMAX7456 proxy(&osd);
-CommandHandler cmd_handler(&proxy);
-
-void processSerial()
-{
-  static byte ndx = 0;
-  char endMarker = '\n';
-  char rc;
-
-  const byte numChars = 128;
-  char receivedChars[numChars]; // an array to store the received data
-
-  while (Serial.available() > 0)
-  {
-    rc = Serial.read();
-
-    if (rc != endMarker)
-    {
-      receivedChars[ndx] = rc;
-      ndx++;
-      if (ndx >= numChars)
-      {
-        ndx = numChars - 1;
-      }
-    }
-    else
-    {
-      receivedChars[ndx] = '\0'; // terminate the string
-      ndx = 0;
-      cmd_handler.parse(receivedChars);
-    }
-  }
-}
+DisplayProxyMAX7456 display(&osd);
+CommandHandler cmd_handler(&display);
 
 void setup()
 {
@@ -51,25 +21,24 @@ void setup()
   Serial.println("================================================================================");
   Serial.println("Initialize...");
   SPI.begin();
-  osd.init(6);
-  osd.clearScreen();
-  osd.setDisplayOffsets(DISP_OFFSET_X, DISP_OFFSET_Y);
-  osd.setBlinkParams(_8fields, _BT_3BT);
+  display.setOffset(DISP_OFFSET_X, DISP_OFFSET_Y);
 
-  osd.activateOSD();
-  osd.activateExternalVideo(false);
-  osd.print("==========================", 0, 0);
-  osd.print("Firmware: " PROJECT_NAME, 0, 1);
-  osd.print("Version:  " VERSION_STRING, 0, 2);
-  osd.print("Built:    " __DATE__ ", " __TIME__, 0, 3);
-  osd.print("==========================", 0, 4);
+  display.write(0, 0, "==========================");
+  display.write(0, 1, "Firmware: " PROJECT_NAME);
+  display.write(0, 2, "Version:  " VERSION_STRING);
+  display.write(0, 3, "Built:    " __DATE__ ", " __TIME__);
+  display.write(0, 4, "==========================");
 
   delay(3000);
-  osd.clearScreen();
+  display.clear();
   Serial.println("Ready!");
 }
 
 void loop()
 {
-  processSerial();
+  while (Serial.available() > 0)
+  {
+    String input = Serial.readStringUntil('\n');
+    cmd_handler.parse(input.c_str());
+  }
 }
\ No newline at end of file