diff --git a/Firmware/GPAD_API/GPAD_API/GPAD_HAL.cpp b/Firmware/GPAD_API/GPAD_API/GPAD_HAL.cpp
index 0de718a..b82ebfb 100644
--- a/Firmware/GPAD_API/GPAD_API/GPAD_HAL.cpp
+++ b/Firmware/GPAD_API/GPAD_API/GPAD_HAL.cpp
@@ -26,6 +26,8 @@
 #include "WiFiManagerOTA.h"
 #include "GPAD_menu.h"
 
+using namespace gpad_hal;
+
 extern IPAddress myIP;
 
 // Use Serial1 for UART communication
@@ -424,24 +426,24 @@ void interpretBuffer(char *buf, int rlen, Stream *serialport, PubSubClient *clie
     printError(serialport);
     return;
   }
-  char C = buf[0];
+  Command command = static_cast<Command>(buf[0]);
 
   serialport->print(F("Command: "));
-  serialport->println(C);
-  switch (C)
+  serialport->println(F(command));
+  switch (command)
   {
-  case 's':
+  case Command::MUTE:
     serialport->println(F("Muting Case!"));
     currentlyMuted = true;
     break;
-  case 'u':
+  case Command::UNMUTE:
     serialport->println(F("UnMuting Case!"));
     currentlyMuted = false;
     break;
-  case 'h': // help
+  case Command::HELP: // help
     printInstructions(serialport);
     break;
-  case 'a':
+  case Command::ALARM:
   {
     // In the case of an alarm state, the rest of the buffer is a message.
     // we will read up to 60 characters from this buffer for display on our
@@ -462,7 +464,7 @@ void interpretBuffer(char *buf, int rlen, Stream *serialport, PubSubClient *clie
 
     break;
   }
-  case 'i': // Information. Firmware Version, Mute Status,
+  case Command::INFO: // Information. Firmware Version, Mute Status,
   {
     // Firmware Version
     //  81+23 = Maximum string length
@@ -474,6 +476,14 @@ void interpretBuffer(char *buf, int rlen, Stream *serialport, PubSubClient *clie
     strcat(onInfoMsg, FIRMWARE_VERSION);
     client->publish(publish_Ack_Topic, onInfoMsg);
     serialport->println(onInfoMsg);
+    onInfoMsg[0] = '\0';
+
+    // Report API version
+    strcat(onInfoMsg, "GPAD API Version: ");
+    strcat(onInfoMsg, gpadApi.getVersion().toString().c_str());
+    client->publish(publish_Ack_Topic, onInfoMsg);
+    serialport->println(onInfoMsg);
+    onInfoMsg[0] = '\0';
 
     // Up time
     onInfoMsg[0] = '\0';
@@ -748,3 +758,31 @@ void annunciateAlarmLevel(Stream *serialport)
     playNotBusyLevel(currentLevel);
   }
 }
+
+GPAD_API::GPAD_API(SemanticVersion version)
+    : version(version)
+{
+}
+
+const SemanticVersion &GPAD_API::getVersion() const
+{
+  return this->version;
+}
+
+SemanticVersion::SemanticVersion(uint8_t major, uint8_t minor, uint8_t patch)
+    : major(major),
+      minor(minor),
+      patch(patch)
+{
+}
+
+std::string SemanticVersion::toString() const
+{
+  std::string versionString = std::to_string(this->major);
+  versionString.push_back('.');
+  versionString.append(std::to_string(this->minor));
+  versionString.push_back('.');
+  versionString.append(std::to_string(this->patch));
+
+  return versionString;
+}
\ No newline at end of file
diff --git a/Firmware/GPAD_API/GPAD_API/GPAD_HAL.h b/Firmware/GPAD_API/GPAD_API/GPAD_HAL.h
index d8baef2..aba0f8e 100644
--- a/Firmware/GPAD_API/GPAD_API/GPAD_HAL.h
+++ b/Firmware/GPAD_API/GPAD_API/GPAD_HAL.h
@@ -18,8 +18,8 @@
 
 */
 
-#ifndef GPAD_HAL
-#define GPAD_HAL 1
+#ifndef GPAD_HAL_H
+#define GPAD_HAL_H
 #include <Stream.h>
 // #include <Arduino.h>
 #include <PubSubClient.h>
@@ -122,6 +122,60 @@ extern HardwareSerial uartSerial1;
 #define UART2_BAUD_RATE 9600
 extern HardwareSerial uartSerial1;
 
+namespace gpad_hal
+{
+
+  static const uint8_t API_MAJOR_VERSION = 0;
+  static const uint8_t API_MINOR_VERSION = 1;
+  static const uint8_t API_PATCH_VERSION = 0;
+
+  enum class Command : char
+  {
+    MUTE = 's',
+    UNMUTE = 'u',
+    HELP = 'h',
+    ALARM = 'a',
+    INFO = 'i',
+  };
+
+  /**
+   * SemanticVersion stores a version following the "semantic versioning" convention
+   * defined here: https://semver.org/
+   *
+   * In summary:
+   *  - Major version defines breaking an incompatible changes with different versions
+   *  - Minor version adds new functionality in a backwards capability
+   *    ie v2.4.1 and v2.5.1 are still compatible but v2.5.1 may have additional functionality
+   *  - Patch version simply addresses bugs with no new features again in a backwards
+   *    compatible way
+   */
+  class SemanticVersion
+  {
+  public:
+    SemanticVersion(uint8_t major, uint8_t minor, uint8_t patch);
+
+    std::string toString() const;
+
+  private:
+    uint8_t major;
+    uint8_t minor;
+    uint8_t patch;
+  };
+
+  class GPAD_API
+  {
+  public:
+    GPAD_API(SemanticVersion version);
+
+    const SemanticVersion &getVersion() const;
+
+  private:
+    const SemanticVersion version;
+  };
+
+  const GPAD_API gpadApi = GPAD_API(SemanticVersion(API_MAJOR_VERSION, API_MINOR_VERSION, API_PATCH_VERSION));
+}
+
 // SPI Functions....
 void setup_spi();
 void receive_byte(byte c);
diff --git a/Firmware/GPAD_API/pre_extra_script.py b/Firmware/GPAD_API/pre_extra_script.py
index e83baff..023a37e 100644
--- a/Firmware/GPAD_API/pre_extra_script.py
+++ b/Firmware/GPAD_API/pre_extra_script.py
@@ -3,7 +3,7 @@
 cpp_defines = [
     ("COMPANY_NAME", "PubInv "),   # For the Broker ID for MQTT 
     ("PROG_NAME", "GPAD_API "),    # This program
-    ("FIRMWARE_VERSION", "0.46 "), # Initial Menu implementation
+    ("FIRMWARE_VERSION", "0.45 "), # Initial Menu implementation
     ("MODEL_NAME", "KRAKE_"), 
     ("LICENSE", "GNU Affero General Public License, version 3 "),
     ("ORIGIN", "US"),