diff --git a/IO.h b/IO.h
index 09987ef..2ae3604 100644
--- a/IO.h
+++ b/IO.h
@@ -58,6 +58,10 @@ public:
   void resetWatchdog();
   uint32_t getWatchdog();
   
+  uint8_t getCPU() const;
+
+  void getUDID(uint8_t* buffer);
+
   void selfTest();
 
 private:
diff --git a/IODue.cpp b/IODue.cpp
index 8921d5b..b4e0700 100644
--- a/IODue.cpp
+++ b/IODue.cpp
@@ -291,4 +291,24 @@ void CIO::delayInt(unsigned int dly)
   delay(dly);
 }
 
+uint8_t CIO::getCPU() const
+{
+  return 0U;
+}
+
+// Code taken from https://github.com/emagii/at91sam3s/blob/master/examples/eefc_uniqueid/main.c
+void CIO::getUDID(uint8_t* buffer)
+{
+  EFC->EEFC_FCR = (0x5A << 24) | EFC_FCMD_STUI;
+
+  ::memcpy(buffer, (void *)IFLASH_ADDR, 16U);
+
+  EFC->EEFC_FCR = (0x5A << 24) | EFC_FCMD_SPUI;
+
+  do {
+    status = EFC->EEFC_FSR ;
+  } while ((status & EEFC_FSR_FRDY) != EEFC_FSR_FRDY);
+}
+
 #endif
+
diff --git a/IOSTM.cpp b/IOSTM.cpp
index ecf4f75..db87da0 100644
--- a/IOSTM.cpp
+++ b/IOSTM.cpp
@@ -545,4 +545,21 @@ void CIO::delayInt(unsigned int dly)
   }
 }
 
+uint8_t CIO::getCPU() const
+{
+  return 2U;
+}
+
+void CIO::getUDID(uint8_t* buffer)
+{
+#if defined(STM32F4XX)
+  ::memcpy(buffer, (void *)0x1FFF7A10, 12U);
+#elif defined(STM32F722xx)
+  ::memcpy(buffer, (void *)0x1FF07A10, 12U);
+#elif defined(STM32F767xx)
+  ::memcpy(buffer, (void *)0x1FF0F420, 12U);
 #endif
+}
+
+#endif
+
diff --git a/IOSTM_CMSIS.cpp b/IOSTM_CMSIS.cpp
index 165c03d..300a88a 100644
--- a/IOSTM_CMSIS.cpp
+++ b/IOSTM_CMSIS.cpp
@@ -23,7 +23,6 @@
 #include "Globals.h"
 #include "IO.h"
 
-
 #if defined(STM32F1)
 
 #if defined(STM32F1_POG)
@@ -485,4 +484,17 @@ void CIO::delayInt(unsigned int dly)
   delay(dly);
 }
 
+uint8_t CIO::getCPU() const
+{
+  return 2U;
+}
+
+void CIO::getUDID(uint8_t* buffer)
+{
+#if defined(STM32F105xC)
+  ::memcpy(buffer, (void *)0x1FFFF7E8, 12U);
 #endif
+}
+
+#endif
+
diff --git a/IOTeensy.cpp b/IOTeensy.cpp
index 0ee4fad..5e1028d 100644
--- a/IOTeensy.cpp
+++ b/IOTeensy.cpp
@@ -275,4 +275,15 @@ void CIO::delayInt(unsigned int dly)
   delay(dly);
 }
 
+uint8_t CIO::getCPU() const
+{
+  return 1U;
+}
+
+void CIO::getUDID(uint8_t* buffer)
+{
+  ::memcpy(buffer, (void *)0x4058, 16U);
+}
+
 #endif
+
diff --git a/SerialPort.cpp b/SerialPort.cpp
index 72614ac..6208904 100644
--- a/SerialPort.cpp
+++ b/SerialPort.cpp
@@ -112,7 +112,7 @@ const uint8_t MMDVM_DEBUG5       = 0xF5U;
 #define	HW_TYPE	"MMDVM"
 #endif
 
-#define DESCRIPTION "20201108 (D-Star/DMR/System Fusion/P25/NXDN/M17/POCSAG/FM/AX.25)"
+#define DESCRIPTION "20201109 (D-Star/DMR/System Fusion/P25/NXDN/M17/POCSAG/FM/AX.25)"
 
 #if defined(GITVERSION)
 #define concat(h, a, b, c) h " " a " " b " GitID #" c ""
@@ -290,7 +290,7 @@ void CSerialPort::getStatus()
 
 void CSerialPort::getVersion()
 {
-  uint8_t reply[150U];
+  uint8_t reply[200U];
 
   reply[0U] = MMDVM_FRAME_START;
   reply[1U] = 0U;
@@ -298,7 +298,13 @@ void CSerialPort::getVersion()
 
   reply[3U] = PROTOCOL_VERSION;
 
-  uint8_t count = 4U;
+  reply[4U] = io.getCPU();
+
+  // Reserve 16 bytes for the UDID
+  ::memcpy(reply + 5U, 0x00U, 16U);
+  io.getUDID(reply + 5U);
+
+  uint8_t count = 21U;
   for (uint8_t i = 0U; HARDWARE[i] != 0x00U; i++, count++)
     reply[count] = HARDWARE[i];