Update hwUniqueID() function (#921)

hal/architecture/MyHw.h

@@ -1,4 +1,4 @@
-/*
+/*
  * The MySensors Arduino library handles the wireless radio link and protocol
  * between your home built sensors/actuators and HA controller of choice.
  * The sensors forms a self healing radio network with optional repeaters. Each
@@ -26,6 +26,8 @@
 #ifndef MyHw_h
 #define MyHw_h
 
+#define MY_HWID_PADDING_BYTE	(0xAAu)
+
 // Implement these as functions or macros
 /*
 #define hwInit() MY_SERIALDEVICE.begin(BAUD_RATE)
@@ -83,7 +85,7 @@ int8_t hwSleep(uint8_t interrupt1, uint8_t mode1, uint8_t interrupt2, uint8_t mo
                unsigned long ms);
 
 /**
-* Retrieve unique ID
+* Retrieve unique hardware ID
 * @param uniqueID unique ID
 * @return True if unique ID successfully retrieved
 */

hal/architecture/MyHwAVR.cpp

@@ -18,6 +18,7 @@
  */
 
 #include "MyHwAVR.h"
+#include "avr/boot.h"
 
 bool hwInit(void)
 {
@@ -239,9 +240,18 @@ inline void hwRandomNumberInit()
 
 bool hwUniqueID(unique_id_t* uniqueID)
 {
-	// not implemented yet
-	(void)uniqueID;
-	return false;
+	// padding
+	(void)memset(uniqueID, MY_HWID_PADDING_BYTE, sizeof(unique_id_t));
+	// no unique ID for non-PB AVR, use HW specifics for diversification
+	*((uint8_t*)uniqueID) = boot_signature_byte_get(0x00);
+	*((uint8_t*)uniqueID + 1) = boot_signature_byte_get(0x02);
+	*((uint8_t*)uniqueID + 2) = boot_signature_byte_get(0x04);
+	*((uint8_t*)uniqueID + 3) = boot_signature_byte_get(0x01); //OSCCAL
+	// ATMEGA328PB specifics, has unique ID
+	//for(uint8_t idx = 0; idx < 10; idx++) {
+	//	*((uint8_t*)uniqueID + 4 + idx) = boot_signature_byte_get(0xE + idx);
+	//}
+	return false;	// false, since no unique ID returned
 }
 
 uint16_t hwCPUVoltage()

hal/architecture/MyHwESP8266.cpp

@@ -65,7 +65,7 @@ void hwWriteConfig(const int addr, uint8_t value)
 bool hwUniqueID(unique_id_t *uniqueID)
 {
 	// padding
-	memset((uint8_t*)uniqueID, 0x0A, sizeof(unique_id_t));
+	(void)memset((uint8_t*)uniqueID, MY_HWID_PADDING_BYTE, sizeof(unique_id_t));
 	uint32_t val = ESP.getChipId();
 	(void)memcpy((uint8_t*)uniqueID, &val, 4);
 	val = ESP.getFlashChipId();

hal/architecture/MyHwTeensy3.cpp

@@ -1,4 +1,4 @@
-/**
+/**
 * The MySensors Arduino library handles the wireless radio link and protocol
 * between your home built sensors/actuators and HA controller of choice.
 * The sensors forms a self healing radio network with optional repeaters. Each
@@ -92,7 +92,7 @@ bool hwUniqueID(unique_id_t *uniqueID)
 {
 #if defined(__MKL26Z64__)
 	(void)memcpy((uint8_t*)uniqueID, &SIM_UIDMH, 12);
-	(void)memset((uint8_t*)uniqueID + 12, 0, 4);
+	(void)memset((uint8_t*)uniqueID + 12, MY_HWID_PADDING_BYTE, 4);
 #else
 	(void)memcpy((uint8_t*)uniqueID, &SIM_UIDH, 16);
 #endif