When deleting "all" settings, do not delete right-left link data

device/src/settings.c

@@ -2,6 +2,8 @@
 #include <zephyr/settings/settings.h>
 #include <zephyr/storage/flash_map.h>
 #include <zephyr/device.h>
+#include <string.h>
+#include <stdio.h>
 #include "bt_conn.h"
 #include "dongle_leds.h"
 #include "stubs.h"
@@ -56,8 +58,49 @@ void Settings_Reload(void) {
     settings_load();
 }
 
+static bool shouldDeleteKey(const char *key) {
+    const char *protectedKey = NULL;
+    const bt_addr_le_t *protectedAddr = NULL;
+#if DEVICE_IS_UHK80_LEFT
+    protectedKey = "uhk/addr/right";
+    protectedAddr = &Peers[PeerIdRight].addr;
+#elif DEVICE_IS_UHK80_RIGHT
+    protectedKey = "uhk/addr/left";
+    protectedAddr = &Peers[PeerIdLeft].addr;
+#endif
+
+    if (protectedAddr == NULL || protectedKey == NULL) {
+        return true;
+    }
+
+    if (strcmp(key, protectedKey) == 0) {
+        return false;
+    }
+
+    // 2*6 bytes + type flag + null terminator
+    const uint8_t addrStrLen = 14;
+    char addrString[addrStrLen];
+
+    // print addr to string without colons in hex using sprintf
+    for (uint8_t i = 0; i < BLE_ADDR_LEN; i++) {
+        sprintf(&addrString[i*2], "%02x", protectedAddr->a.val[BLE_ADDR_LEN-1-i]);
+    }
+    addrString[addrStrLen-2] = protectedAddr->type ? '1' : '0';
+    addrString[addrStrLen-1] = '\0';
+
+    const char* keyAddr = key + strlen(key) + 1 - addrStrLen;
+
+    bool keyIsProtected = strncmp(keyAddr, addrString, addrStrLen) == 0;
+
+    printk("Matched key: %s, addrString: %s ? %d\n", keyAddr, addrString, keyIsProtected);
+
+    return !keyIsProtected;
+}
+
 static int delete_handler(const char *key, size_t len, settings_read_cb read_cb, void *cb_arg, void *param) {
-    settings_delete(key);
+    if (shouldDeleteKey(key)) {
+        settings_delete(key);
+    }
     return 0;
 }