Add device unique id (#5092)

* Add device unique id

* Trunk

* WIP

* Esp32 implementation

* Trunk

* Check for ESP_EFUSE_OPTIONAL_UNIQUE_ID

* Comment print

* Trunk

src/mesh/NodeDB.cpp

@@ -34,7 +34,11 @@
 #endif
 #include "modules/StoreForwardModule.h"
 #include <Preferences.h>
+#include <esp_efuse.h>
+#include <esp_efuse_table.h>
 #include <nvs_flash.h>
+#include <soc/efuse_reg.h>
+#include <soc/soc.h>
 #endif
 
 #ifdef ARCH_PORTDUINO
@@ -109,6 +113,43 @@ NodeDB::NodeDB()
     uint32_t channelFileCRC = crc32Buffer(&channelFile, sizeof(channelFile));
 
     int saveWhat = 0;
+    bool hasUniqueId = false;
+    // Get device unique id
+#if defined(ARCH_ESP32) && defined(ESP_EFUSE_OPTIONAL_UNIQUE_ID)
+    uint32_t unique_id[4];
+    // ESP32 factory burns a unique id in efuse for S2+ series and evidently C3+ series
+    // This is used for HMACs in the esp-rainmaker AIOT platform and seems to be a good choice for us
+    esp_err_t err = esp_efuse_read_field_blob(ESP_EFUSE_OPTIONAL_UNIQUE_ID, unique_id, sizeof(unique_id) * 8);
+    if (err == ESP_OK) {
+        memcpy(myNodeInfo.device_id.bytes, unique_id, sizeof(unique_id));
+        myNodeInfo.device_id.size = 16;
+        hasUniqueId = true;
+    } else {
+        LOG_WARN("Failed to read unique id from efuse");
+    }
+#elif defined(ARCH_NRF52)
+    // Nordic applies a FIPS compliant Random ID to each chip at the factory
+    // We concatenate the device address to the Random ID to create a unique ID for now
+    // This will likely utilize a crypto module in the future
+    uint64_t device_id_start = ((uint64_t)NRF_FICR->DEVICEID[1] << 32) | NRF_FICR->DEVICEID[0];
+    uint64_t device_id_end = ((uint64_t)NRF_FICR->DEVICEADDR[1] << 32) | NRF_FICR->DEVICEADDR[0];
+    memcpy(myNodeInfo.device_id.bytes, &device_id_start, sizeof(device_id_start));
+    memcpy(myNodeInfo.device_id.bytes + sizeof(device_id_start), &device_id_end, sizeof(device_id_end));
+    myNodeInfo.device_id.size = 16;
+    hasUniqueId = true;
+#else
+    // FIXME - implement for other platforms
+#endif
+    // Uncomment below to print the device id
+    // if (hasUniqueId) {
+    //     std::string deviceIdHex;
+    //     for (size_t i = 0; i < myNodeInfo.device_id.size; ++i) {
+    //         char buf[3];
+    //         snprintf(buf, sizeof(buf), "%02X", myNodeInfo.device_id.bytes[i]);
+    //         deviceIdHex += buf;
+    //     }
+    //     LOG_DEBUG("Device ID (HEX): %s", deviceIdHex.c_str());
+    // }
 
     // likewise - we always want the app requirements to come from the running appload
     myNodeInfo.min_app_version = 30200; // format is Mmmss (where M is 1+the numeric major number. i.e. 30200 means 2.2.00