feat: implement Wi-Fi provisioning and persistent configuration

test/host/fake_nvs.c

@@ -0,0 +1,100 @@
+#include "nvs.h"
+#include "nvs_flash.h"
+
+#include <string.h>
+
+static int initialized;
+static int present;
+static uint32_t schema;
+static char ssid[33];
+static char password[64];
+
+esp_err_t nvs_flash_init(void)
+{
+    initialized = 1;
+    return ESP_OK;
+}
+
+esp_err_t nvs_flash_deinit(void)
+{
+    initialized = 0;
+    return ESP_OK;
+}
+
+esp_err_t nvs_flash_erase(void)
+{
+    present = 0;
+    return ESP_OK;
+}
+
+esp_err_t nvs_open(const char *namespace_name, int mode, nvs_handle_t *handle)
+{
+    if (!initialized || strcmp(namespace_name, "maze32") != 0) return ESP_FAIL;
+    if (mode == NVS_READONLY && !present) return ESP_ERR_NVS_NOT_FOUND;
+    *handle = 1U;
+    return ESP_OK;
+}
+
+void nvs_close(nvs_handle_t handle)
+{
+    (void)handle;
+}
+
+esp_err_t nvs_get_u32(nvs_handle_t handle, const char *key, uint32_t *value)
+{
+    (void)handle;
+    if (!present || strcmp(key, "cfg_ver") != 0) return ESP_ERR_NVS_NOT_FOUND;
+    *value = schema;
+    return ESP_OK;
+}
+
+esp_err_t nvs_set_u32(nvs_handle_t handle, const char *key, uint32_t value)
+{
+    (void)handle;
+    if (strcmp(key, "cfg_ver") != 0) return ESP_FAIL;
+    schema = value;
+    present = 1;
+    return ESP_OK;
+}
+
+esp_err_t nvs_get_str(nvs_handle_t handle, const char *key, char *output, size_t *length)
+{
+    (void)handle;
+    const char *source = strcmp(key, "wifi_ssid") == 0 ? ssid :
+                         strcmp(key, "wifi_pass") == 0 ? password : NULL;
+    if (!present || source == NULL) return ESP_ERR_NVS_NOT_FOUND;
+    size_t required = strlen(source) + 1U;
+    if (*length < required) return ESP_FAIL;
+    memcpy(output, source, required);
+    *length = required;
+    return ESP_OK;
+}
+
+esp_err_t nvs_set_str(nvs_handle_t handle, const char *key, const char *value)
+{
+    (void)handle;
+    char *destination = strcmp(key, "wifi_ssid") == 0 ? ssid :
+                        strcmp(key, "wifi_pass") == 0 ? password : NULL;
+    size_t capacity = strcmp(key, "wifi_ssid") == 0 ? sizeof(ssid) : sizeof(password);
+    if (destination == NULL || strlen(value) >= capacity) return ESP_FAIL;
+    memcpy(destination, value, strlen(value) + 1U);
+    return ESP_OK;
+}
+
+esp_err_t nvs_erase_all(nvs_handle_t handle)
+{
+    (void)handle;
+    present = 0;
+    return ESP_OK;
+}
+
+esp_err_t nvs_commit(nvs_handle_t handle)
+{
+    (void)handle;
+    return ESP_OK;
+}
+
+void fake_nvs_set_schema(uint32_t version)
+{
+    schema = version;
+}