From 307103f95a0375c23cec04d46541fa290d503025 Mon Sep 17 00:00:00 2001
From: Arne Schwabe <arne@rfc2549.org>
Date: Mon, 31 Oct 2016 18:47:15 +0100
Subject: [PATCH 1/2] Use STM32 device ID as default ID for Multiprotocol. Has
 the advantage that this is persistent even the flash emulated EEPROM is wiped
 by reprogramming.

---
 Multiprotocol/Multiprotocol.ino | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Multiprotocol/Multiprotocol.ino b/Multiprotocol/Multiprotocol.ino
index fc965f5..cf7900e 100644
--- a/Multiprotocol/Multiprotocol.ino
+++ b/Multiprotocol/Multiprotocol.ino
@@ -1017,7 +1017,14 @@ static uint32_t random_id(uint16_t adress, uint8_t create_new)
 			return id;
 	}
 	// Generate a random ID
+#if defined STM32_BOARD
+#define STM32_UUID ((uint32_t *)0x1FFFF7E8)
+    if (!create_new)
+        id = STM32_UUID[0] ^ STM32_UUID[1] ^ STM32_UUID[2];
+    else
+#else    
 	id = random(0xfefefefe) + ((uint32_t)random(0xfefefefe) << 16);
+#endif    
 	for(uint8_t i=0;i<4;i++)
 	{
 		eeprom_write_byte((EE_ADDR)adress+i,id);

From 20cb173f8ea366486e7e1c27ac97fcefe350de3e Mon Sep 17 00:00:00 2001
From: Arne Schwabe <arne@rfc2549.org>
Date: Mon, 31 Oct 2016 18:48:00 +0100
Subject: [PATCH 2/2] Default to defining STM32_BOARD when compiling for arm

---
 Multiprotocol/_Config.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Multiprotocol/_Config.h b/Multiprotocol/_Config.h
index 5421a84..4f772d3 100644
--- a/Multiprotocol/_Config.h
+++ b/Multiprotocol/_Config.h
@@ -22,7 +22,9 @@
 /********************/
 //Uncomment one of the line below if you have a different module not based on the original Multi Atmega328p design which includes the 4-in-1.
 //If you don't know then leave them commented.
-//#define STM32_BOARD
+#ifdef __arm__
+#define STM32_BOARD
+#endif
 
 
 /*******************/