Add persistent storage for Mesh config.

CMakeLists.txt

@@ -12,6 +12,10 @@ elseif("nimble" IN_LIST BUILD_COMPONENTS OR "__nimble" IN_LIST __hack_component_
     list(APPEND ESP_NIMBLE_PRIV_REQUIRES
         nimble
     )
+elseif("bt" IN_LIST BUILD_COMPONENTS OR "__bt" IN_LIST __hack_component_targets)
+    list(APPEND ESP_NIMBLE_PRIV_REQUIRES
+        bt
+    )
 endif()
 
 if("arduino" IN_LIST BUILD_COMPONENTS OR __hack_component_targets MATCHES "__idf_arduino")
@@ -20,15 +24,7 @@ if("arduino" IN_LIST BUILD_COMPONENTS OR __hack_component_targets MATCHES "__idf
     )
 endif()
 
-idf_component_register(
+set(srcs "src/NimBLE2904.cpp"
-  REQUIRED_IDF_TARGETS
-    "esp32"
-    "esp32s3"
-    "esp32c3"
-  INCLUDE_DIRS
-    "src"
-  SRCS
-    "src/NimBLE2904.cpp"
     "src/NimBLEAddress.cpp"
     "src/NimBLEAdvertisedDevice.cpp"
     "src/NimBLEAdvertising.cpp"
@@ -41,10 +37,6 @@ idf_component_register(
     "src/NimBLEEddystoneURL.cpp"
     "src/NimBLEExtAdvertising.cpp"
     "src/NimBLEHIDDevice.cpp"
-    "src/NimBLEMeshCreateModel.c"
-    "src/NimBLEMeshElement.cpp"
-    "src/NimBLEMeshModel.cpp"
-    "src/NimBLEMeshNode.cpp"
     "src/NimBLERemoteCharacteristic.cpp"
     "src/NimBLERemoteDescriptor.cpp"
     "src/NimBLERemoteService.cpp"
@@ -53,10 +45,36 @@ idf_component_register(
     "src/NimBLEServer.cpp"
     "src/NimBLEService.cpp"
     "src/NimBLEUtils.cpp"
-    "src/NimBLEUUID.cpp"
+    "src/NimBLEUUID.cpp")
+
+if(CONFIG_BT_NIMBLE_MESH)
+    list(APPEND srcs "src/NimBLEMeshCreateModel.c"
+    "src/NimBLEMeshElement.cpp"
+    "src/NimBLEMeshModel.cpp"
+    "src/NimBLEMeshNode.cpp")
+endif()
+
+if(CONFIG_NIMBLE_CPP_PERSIST_MESH_SETTINGS)
+    list(APPEND srcs "src/mesh_config_store/config/config_store.c")
+endif()
+
+idf_component_register(
+  REQUIRED_IDF_TARGETS
+    "esp32"
+    "esp32s3"
+    "esp32c3"
+  INCLUDE_DIRS
+    "src"
+  SRCS "${srcs}"
+
   REQUIRES
     bt
     nvs_flash
   PRIV_REQUIRES
     ${ESP_NIMBLE_PRIV_REQUIRES}
 )
+
+if(CONFIG_BT_NIMBLE_MESH AND CONFIG_NIMBLE_CPP_PERSIST_MESH_SETTINGS)
+  idf_build_set_property(COMPILE_OPTIONS "-DMYNEWT_VAL_BLE_MESH_SETTINGS=1" APPEND)
+  idf_build_set_property(COMPILE_OPTIONS "-I${COMPONENT_DIR}/src/mesh_config_store" APPEND)
+endif()

Kconfig

@@ -33,7 +33,7 @@ config NIMBLE_CPP_ENABLE_RETURN_CODE_TEXT
         Enabling this option will display return code values as text
         messages in the debug log. This will use approximately 8kB
         of flash memory.
-        
+
 config NIMBLE_CPP_ENABLE_GAP_EVENT_CODE_TEXT
     bool "Show NimBLE gap events as text in debug log."
     default "n"
@@ -47,7 +47,7 @@ config NIMBLE_CPP_ENABLE_ADVERTISMENT_TYPE_TEXT
     default "n"
     help
         Enabling this option will display advertisment types recieved
-        while scanning as text messages in the debug log. 
+        while scanning as text messages in the debug log.
         This will use approximately 250 bytes of flash memory.
 
 config NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
@@ -68,5 +68,13 @@ config NIMBLE_CPP_ATT_VALUE_INIT_LENGTH
         when the constructor is called. This is also the size used when a remote
         characteristic or descriptor is constructed before a value is read/notifed.
         Increasing this will reduce reallocations but increase memory footprint.
-        
+
+config NIMBLE_CPP_PERSIST_MESH_SETTINGS
+    bool "Enable persistent storage of mesh config settings."
+    default "n"
+    depends on BT_NIMBLE_MESH
+    help
+        Enabling this option will store the provisioning and app key settings
+        in non-volatile storage when using NimBLE Mesh.
+
 endmenu

src/NimBLEMeshCreateModel.c

@@ -6,6 +6,9 @@
  *
  */
 
+#include "nimconfig.h"
+#if CONFIG_BT_NIMBLE_MESH
+
 #include "NimBLEMeshCreateModel.h"
 
 static struct bt_mesh_model_cb mod_cb = {
@@ -28,3 +31,5 @@ struct bt_mesh_model createGenModel(int16_t _id, struct bt_mesh_model_op* op,
     struct bt_mesh_model mod = BT_MESH_MODEL_CB(_id, op, pub, udata, &mod_cb);
     return mod;
 }
+
+#endif // CONFIG_BT_NIMBLE_MESH

src/NimBLEMeshElement.cpp

@@ -6,6 +6,9 @@
  *
  */
 
+#include "nimconfig.h"
+#if CONFIG_BT_NIMBLE_MESH
+
 #include "NimBLEMeshElement.h"
 #include "NimBLELog.h"
 #include "NimBLEMeshCreateModel.h"
@@ -139,4 +142,4 @@ bt_mesh_elem* NimBLEMeshElement::start() {
     return m_pElem;
 }
 
-
+#endif // CONFIG_BT_NIMBLE_MESH

src/NimBLEMeshModel.cpp

@@ -6,6 +6,9 @@
  *
  */
 
+#include "nimconfig.h"
+#if CONFIG_BT_NIMBLE_MESH
+
 #include "NimBLEMeshModel.h"
 #include "NimBLEUtils.h"
 #include "NimBLELog.h"
@@ -693,3 +696,5 @@ void NimBLEHealthSrvCallbacks::attentionOff(bt_mesh_model *model)
     NimBLEMeshModel* pModel = NimBLEDevice::getMeshNode()->getHealthModel(model);
     pModel->m_callbacks->attentionOff(pModel);
 }
+
+#endif // CONFIG_BT_NIMBLE_MESH

src/NimBLEMeshNode.cpp

@@ -7,7 +7,7 @@
  */
 
 #include "nimconfig.h"
-#if defined(CONFIG_BT_ENABLED)
+#if CONFIG_BT_NIMBLE_MESH
 
 #include "NimBLEMeshNode.h"
 #include "NimBLELog.h"
@@ -206,5 +206,4 @@ bool NimBLEMeshNode::start() {
     return true;
 }
 
-
+#endif // CONFIG_BT_NIMBLE_MESH
-#endif // CONFIG_BT_ENABLED

src/mesh_config_store/base64/base64.h

@@ -0,0 +1,295 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+#ifndef __UTIL_BASE64_H
+#define __UTIL_BASE64_H
+
+#include <stdint.h>
+#include <string.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+struct base64_decoder {
+    /*** public */
+    const char *src;
+    void *dst;
+    int src_len; /* <=0 if src ends with '\0' */
+    int dst_len; /* <=0 if dst unbounded */
+
+    /*** private */
+    char buf[4];
+    int buf_len;
+};
+
+static const char base64_chars[] =
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+
+static int
+pos(char c)
+{
+    const char *p;
+    for (p = base64_chars; *p; p++)
+        if (*p == c)
+            return p - base64_chars;
+    return -1;
+}
+
+int
+base64_encode(const void *data, int size, char *s, uint8_t should_pad)
+{
+    char *p;
+    int i;
+    int c;
+    const unsigned char *q;
+    char *last;
+    int diff;
+
+    p = s;
+
+    q = (const unsigned char *) data;
+    last = NULL;
+    i = 0;
+    while (i < size) {
+        c = q[i++];
+        c *= 256;
+        if (i < size)
+            c += q[i];
+        i++;
+        c *= 256;
+        if (i < size)
+            c += q[i];
+        i++;
+        p[0] = base64_chars[(c & 0x00fc0000) >> 18];
+        p[1] = base64_chars[(c & 0x0003f000) >> 12];
+        p[2] = base64_chars[(c & 0x00000fc0) >> 6];
+        p[3] = base64_chars[(c & 0x0000003f) >> 0];
+        last = p;
+        p += 4;
+    }
+
+    if (last) {
+        diff = i - size;
+        if (diff > 0) {
+            if (should_pad) {
+                memset(last + (4 - diff), '=', diff);
+            } else {
+                p = last + (4 - diff);
+            }
+        }
+    }
+
+    *p = 0;
+
+    return (p - s);
+}
+
+int
+base64_pad(char *buf, int len)
+{
+    int remainder;
+
+    remainder = len % 4;
+    if (remainder == 0) {
+        return (0);
+    }
+
+    memset(buf, '=', 4 - remainder);
+
+    return (4 - remainder);
+}
+
+#define DECODE_ERROR -1
+
+static unsigned int
+token_decode(const char *token, int len)
+{
+    int i;
+    unsigned int val = 0;
+    int marker = 0;
+
+    if (len < 4) {
+        return DECODE_ERROR;
+    }
+
+    for (i = 0; i < 4; i++) {
+        val *= 64;
+        if (token[i] == '=') {
+            marker++;
+        } else if (marker > 0) {
+            return DECODE_ERROR;
+        } else {
+            val += pos(token[i]);
+        }
+    }
+
+    if (marker > 2) {
+        return DECODE_ERROR;
+    }
+
+    return (marker << 24) | val;
+}
+
+int
+base64_decoder_go(struct base64_decoder *dec)
+{
+    unsigned int marker;
+    unsigned int val;
+    uint8_t *dst;
+    char sval;
+    int read_len;
+    int src_len;
+    int src_rem;
+    int src_off;
+    int dst_len;
+    int dst_off;
+    int i;
+
+    dst = dec->dst;
+    dst_off = 0;
+    src_off = 0;
+
+    /* A length <= 0 means "unbounded". */
+    if (dec->src_len <= 0) {
+        src_len = INT_MAX;
+    } else {
+        src_len = dec->src_len;
+    }
+    if (dec->dst_len <= 0) {
+        dst_len = INT_MAX;
+    } else {
+        dst_len = dec->dst_len;
+    }
+
+    while (1) {
+        src_rem = src_len - src_off;
+        if (src_rem == 0) {
+            /* End of source input. */
+            break;
+        }
+
+        if (dec->src[src_off] == '\0') {
+            /* End of source string. */
+            break;
+        }
+
+        /* Account for possibility of partial token from previous call. */
+        read_len = 4 - dec->buf_len;
+
+        /* Detect invalid input. */
+        for (i = 0; i < read_len; i++) {
+            sval = dec->src[src_off + i];
+            if (sval == '\0') {
+                /* Incomplete input. */
+                return -1;
+            }
+            if (sval != '=' && strchr(base64_chars, sval) == NULL) {
+                /* Invalid base64 character. */
+                return -1;
+            }
+        }
+
+        if (src_rem < read_len) {
+            /* Input contains a partial token.  Stash it for use during the
+             * next call.
+             */
+            memcpy(&dec->buf[dec->buf_len], &dec->src[src_off], src_rem);
+            dec->buf_len += src_rem;
+            break;
+        }
+
+        /* Copy full token into buf and decode it. */
+        memcpy(&dec->buf[dec->buf_len], &dec->src[src_off], read_len);
+        val = token_decode(dec->buf, read_len);
+        if (val == DECODE_ERROR) {
+            return -1;
+        }
+        src_off += read_len;
+        dec->buf_len = 0;
+
+        marker = (val >> 24) & 0xff;
+
+        if (dst_off >= dst_len) {
+            break;
+        }
+        dst[dst_off] = (val >> 16) & 0xff;
+        dst_off++;
+
+        if (marker < 2) {
+            if (dst_off >= dst_len) {
+                break;
+            }
+            dst[dst_off] = (val >> 8) & 0xff;
+            dst_off++;
+        }
+
+        if (marker < 1) {
+            if (dst_off >= dst_len) {
+                break;
+            }
+            dst[dst_off] = val & 0xff;
+            dst_off++;
+        }
+    }
+
+    return dst_off;
+}
+
+int
+base64_decode(const char *str, void *data)
+{
+    struct base64_decoder dec = {
+        .src = str,
+        .dst = data,
+    };
+
+    return base64_decoder_go(&dec);
+}
+
+int
+base64_decode_maxlen(const char *str, void *data, int len)
+{
+    struct base64_decoder dec = {
+        .src = str,
+        .dst = data,
+        .dst_len = len,
+    };
+
+    return base64_decoder_go(&dec);
+}
+
+int
+base64_decode_len(const char *str)
+{
+    int len;
+
+    len = strlen(str);
+    while (len && str[len - 1] == '=') {
+        len--;
+    }
+    return len * 3 / 4;
+}
+
+#define BASE64_ENCODE_SIZE(__size) (((((__size) - 1) / 3) * 4) + 4)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __UTIL_BASE64_H__ */

src/mesh_config_store/config/config.h

@@ -0,0 +1,238 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+#ifndef __SYS_CONFIG_H_
+#define __SYS_CONFIG_H_
+
+#include "../../nimconfig.h"
+#if defined(CONFIG_NIMBLE_CPP_IDF)
+#  include <os/queue.h>
+#else
+#  include "nimble/porting/nimble/include/os/queue.h"
+#endif
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define CONF_MAX_DIR_DEPTH	8	/* max depth of config tree */
+#define CONF_MAX_NAME_LEN	(8 * CONF_MAX_DIR_DEPTH)
+
+/**
+ * Type of configuration value.
+ */
+typedef enum conf_type {
+    CONF_NONE = 0,
+    CONF_DIR,
+    /** 8-bit signed integer */
+    CONF_INT8,
+    /** 16-bit signed integer */
+    CONF_INT16,
+    /** 32-bit signed integer */
+    CONF_INT32,
+    /** 64-bit signed integer */
+    CONF_INT64,
+    /** String */
+    CONF_STRING,
+    /** Bytes */
+    CONF_BYTES,
+    /** Floating point */
+    CONF_FLOAT,
+    /** Double precision */
+    CONF_DOUBLE,
+    /** Boolean */
+    CONF_BOOL,
+    /** 8-bit unsigned integer */
+    CONF_UINT8,
+    /** 16-bit unsigned integer */
+    CONF_UINT16,
+    /** 32-bit unsigned integer */
+    CONF_UINT32,
+    /** 64-bit unsigned integer */
+    CONF_UINT64,
+} __attribute__((__packed__)) conf_type_t;
+
+/**
+ * Parameter to commit handler describing where data is going to.
+ */
+enum conf_export_tgt {
+    /** Value is to be persisted */
+    CONF_EXPORT_PERSIST,
+    /** Value is to be display */
+    CONF_EXPORT_SHOW
+};
+
+typedef enum conf_export_tgt conf_export_tgt_t;
+
+/**
+ * Handler for getting configuration items, this handler is called
+ * per-configuration section.  Configuration sections are delimited
+ * by '/', for example:
+ *
+ *  - section/name/value
+ *
+ * Would be passed as:
+ *
+ *  - argc = 3
+ *  - argv[0] = section
+ *  - argv[1] = name
+ *  - argv[2] = value
+ *
+ * The handler returns the value into val, null terminated, up to
+ * val_len_max.
+ *
+ * @param argc          The number of sections in the configuration variable
+ * @param argv          The array of configuration sections
+ * @param val           A pointer to the buffer to return the configuration
+ *                      value into.
+ * @param val_len_max   The maximum length of the val buffer to copy into.
+ *
+ * @return A pointer to val or NULL if error.
+ */
+typedef char *(*conf_get_handler_t)(int argc, char **argv, char *val, int val_len_max);
+typedef char *(*conf_get_handler_ext_t)(int argc, char **argv, char *val, int val_len_max, void *arg);
+
+/**
+ * Set the configuration variable pointed to by argc and argv.  See
+ * description of ch_get_handler_t for format of these variables.  This sets the
+ * configuration variable to the shadow value, but does not apply the configuration
+ * change.  In order to apply the change, call the ch_commit() handler.
+ *
+ * @param argc   The number of sections in the configuration variable.
+ * @param argv   The array of configuration sections
+ * @param val    The value to configure that variable to
+ *
+ * @return 0 on success, non-zero error code on failure.
+ */
+typedef int (*conf_set_handler_t)(int argc, char **argv, char *val);
+typedef int (*conf_set_handler_ext_t)(int argc, char **argv, char *val, void *arg);
+
+/**
+ * Commit shadow configuration state to the active configuration.
+ *
+ * @return 0 on success, non-zero error code on failure.
+ */
+typedef int (*conf_commit_handler_t)(void);
+typedef int (*conf_commit_handler_ext_t)(void *arg);
+
+/**
+ * Called per-configuration variable being exported.
+ *
+ * @param name The name of the variable to export
+ * @param val  The value of the variable to export
+ */
+typedef void (*conf_export_func_t)(char *name, char *val);
+
+/**
+ * Export all of the configuration variables, calling the export_func
+ * per variable being exported.
+ *
+ * @param export_func  The export function to call.
+ * @param tgt          The target of the export, either for persistence or display.
+ *
+ * @return 0 on success, non-zero error code on failure.
+ */
+typedef int (*conf_export_handler_t)(conf_export_func_t export_func,
+                                     conf_export_tgt_t tgt);
+typedef int (*conf_export_handler_ext_t)(conf_export_func_t export_func,
+                                         conf_export_tgt_t tgt, void *arg);
+
+/**
+ * Configuration handler, used to register a config item/subtree.
+ */
+struct conf_handler {
+    SLIST_ENTRY(conf_handler) ch_list;
+    /**
+     * The name of the conifguration item/subtree
+     */
+    char *ch_name;
+
+    /**
+     * Whether to use the extended callbacks.
+     * false: standard
+     * true:  extended
+     */
+    bool ch_ext;
+
+    /** Get configuration value */
+    union {
+        conf_get_handler_t ch_get;
+        conf_get_handler_ext_t ch_get_ext;
+    };
+
+    /** Set configuration value */
+    union {
+        conf_set_handler_t ch_set;
+        conf_set_handler_ext_t ch_set_ext;
+    };
+
+    /** Commit configuration value */
+    union {
+        conf_commit_handler_t ch_commit;
+        conf_commit_handler_ext_t ch_commit_ext;
+    };
+
+    /** Export configuration value */
+    union {
+        conf_export_handler_t ch_export;
+        conf_export_handler_ext_t ch_export_ext;
+    };
+
+    /** Custom argument that gets passed to the extended callbacks */
+    void *ch_arg;
+};
+
+/**
+ * Register a handler for configurations items.
+ *
+ * @param cf Structure containing registration info.
+ *
+ * @return 0 on success, non-zero on failure.
+ */
+int conf_register(struct conf_handler *cf);
+
+/**
+ * Load configuration from registered persistence sources. Handlers for
+ * configuration subtrees registered earlier will be called for encountered
+ * values.
+ *
+ * @return 0 on success, non-zero on failure.
+ */
+int conf_load(void);
+
+/**
+ * Write a single configuration value to persisted storage (if it has
+ * changed value).
+ *
+ * @param name Name/key of the configuration item.
+ * @param var Value of the configuration item.
+ *
+ * @return 0 on success, non-zero on failure.
+ */
+int conf_save_one(const char *name, char *var);
+
+#ifdef __cplusplus
+}
+#endif
+
+#define SYSINIT_PANIC_ASSERT_MSG(rc, msg) assert(rc)
+
+#endif /* __SYS_CONFIG_H_ */

src/mesh_config_store/config/config_store.c

@@ -0,0 +1,136 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#include "nimconfig.h"
+#ifdef ESP_PLATFORM
+#if CONFIG_BT_NIMBLE_MESH && CONFIG_NIMBLE_CPP_PERSIST_MESH_SETTINGS
+
+#include "config.h"
+#include "nvs.h"
+
+#include <string.h>
+
+static struct conf_handler* config_handler;
+
+int conf_parse_name(char *name, int *name_argc, char *name_argv[])
+{
+    char *tok;
+    char *tok_ptr;
+    const char *sep = "/";
+    int i;
+
+    tok = strtok_r(name, sep, &tok_ptr);
+
+    i = 0;
+    while (tok) {
+        name_argv[i++] = tok;
+        tok = strtok_r(NULL, sep, &tok_ptr);
+    }
+    *name_argc = i;
+
+    return 0;
+}
+
+int conf_load(void)
+{
+    esp_err_t err;
+    nvs_handle handle;
+
+    err = nvs_open(config_handler->ch_name, NVS_READONLY, &handle);
+    if (err != ESP_OK) return err;
+
+    nvs_iterator_t it = nvs_entry_find("nvs", config_handler->ch_name, NVS_TYPE_ANY);
+
+    while (it != NULL) {
+        nvs_entry_info_t info;
+        nvs_entry_info(it, &info);
+        it = nvs_entry_next(it);
+
+        size_t required_size = 0;
+        err = nvs_get_str(handle, info.key, NULL, &required_size);
+        if (err != ESP_OK && err != ESP_ERR_NVS_NOT_FOUND) return err;
+
+        char* val = malloc(required_size);
+        if (required_size > 0) {
+            err = nvs_get_str(handle, info.key, val, &required_size);
+            if (err != ESP_OK) {
+                free(val);
+                return err;
+            }
+        }
+
+        int name_argc;
+        char *name_argv[8];
+        conf_parse_name(info.key, &name_argc, name_argv);
+
+        config_handler->ch_set(name_argc, &name_argv[0], val);
+        free(val);
+    }
+
+    nvs_close(handle);
+    config_handler->ch_commit();
+    return ESP_OK;
+}
+
+int conf_save_one(const char *name, char *var)
+{
+    esp_err_t err;
+    nvs_handle_t handle;
+    int name_argc;
+    char *name_argv[CONF_MAX_DIR_DEPTH];
+    char n[CONF_MAX_NAME_LEN];
+
+    strcpy(n, name);
+    conf_parse_name(n, &name_argc, name_argv);
+
+    err = nvs_open(name_argv[0], NVS_READWRITE, &handle);
+    if (err != ESP_OK) return err;
+
+    const char* key = name_argv[1];
+    if (name_argc > 2) {
+        key = name;
+        while (*key != '/') {
+            key++;
+        }
+        key++;
+    }
+
+    if (var) {
+        err = nvs_set_str(handle, key, var);
+        if (err != ESP_OK) return err;
+    } else {
+        err = nvs_erase_key(handle, key);
+        if (err != ESP_OK && err != ESP_ERR_NVS_NOT_FOUND) return err;
+    }
+
+    err = nvs_commit(handle);
+    if (err != ESP_OK) return err;
+
+    nvs_close(handle);
+    return ESP_OK;
+}
+
+int conf_register(struct conf_handler *cf)
+{
+    config_handler = cf;
+    return 0;
+}
+
+#endif // CONFIG_BT_NIMBLE_MESH && MYNEWT_VAL_BLE_MESH_SETTINGS
+#endif // ESP_PLATFORM