245 lines
9.3 KiB
C
245 lines
9.3 KiB
C
/* Wi-Fi Provisioning Manager Example
|
|
|
|
This example code is in the Public Domain (or CC0 licensed, at your option.)
|
|
|
|
Unless required by applicable law or agreed to in writing, this
|
|
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
|
|
CONDITIONS OF ANY KIND, either express or implied.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
#include <freertos/FreeRTOS.h>
|
|
#include <freertos/task.h>
|
|
#include <freertos/event_groups.h>
|
|
|
|
#include <esp_log.h>
|
|
#include <esp_wifi.h>
|
|
#include <esp_event_loop.h>
|
|
#include <nvs_flash.h>
|
|
|
|
#include <wifi_provisioning/manager.h>
|
|
#include <wifi_provisioning/scheme_ble.h>
|
|
#include <wifi_provisioning/scheme_softap.h>
|
|
|
|
static const char *TAG = "app";
|
|
|
|
/* Signal Wi-Fi events on this event-group */
|
|
const int WIFI_CONNECTED_EVENT = BIT0;
|
|
static EventGroupHandle_t wifi_event_group;
|
|
|
|
/* Event handler for catching system events */
|
|
static esp_err_t event_handler(void *ctx, system_event_t *event)
|
|
{
|
|
/* Pass event information to provisioning manager so that it can
|
|
* maintain its internal state depending upon the system event */
|
|
wifi_prov_mgr_event_handler(ctx, event);
|
|
|
|
/* Global event handling */
|
|
switch (event->event_id) {
|
|
case SYSTEM_EVENT_STA_START:
|
|
esp_wifi_connect();
|
|
break;
|
|
case SYSTEM_EVENT_STA_GOT_IP:
|
|
ESP_LOGI(TAG, "Connected with IP Address:%s",
|
|
ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
|
|
xEventGroupSetBits(wifi_event_group, WIFI_CONNECTED_EVENT);
|
|
break;
|
|
case SYSTEM_EVENT_STA_DISCONNECTED:
|
|
ESP_LOGI(TAG, "Disconnected. Connecting to the AP again...");
|
|
esp_wifi_connect();
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
/* Event handler for catching provisioning manager events */
|
|
static void prov_event_handler(void *user_data,
|
|
wifi_prov_cb_event_t event, void *event_data)
|
|
{
|
|
switch (event) {
|
|
case WIFI_PROV_START:
|
|
ESP_LOGI(TAG, "Provisioning started");
|
|
break;
|
|
case WIFI_PROV_CRED_RECV: {
|
|
wifi_sta_config_t *wifi_sta_cfg = (wifi_sta_config_t *)event_data;
|
|
/* If SSID length is exactly 32 bytes, null termination
|
|
* will not be present, so explicitly obtain the length */
|
|
size_t ssid_len = strnlen((const char *)wifi_sta_cfg->ssid, sizeof(wifi_sta_cfg->ssid));
|
|
ESP_LOGI(TAG, "Received Wi-Fi credentials"
|
|
"\n\tSSID : %.*s\n\tPassword : %s",
|
|
ssid_len, (const char *) wifi_sta_cfg->ssid,
|
|
(const char *) wifi_sta_cfg->password);
|
|
break;
|
|
}
|
|
case WIFI_PROV_CRED_FAIL: {
|
|
wifi_prov_sta_fail_reason_t *reason = (wifi_prov_sta_fail_reason_t *)event_data;
|
|
ESP_LOGE(TAG, "Provisioning failed!\n\tReason : %s"
|
|
"\n\tPlease reset to factory and retry provisioning",
|
|
(*reason == WIFI_PROV_STA_AUTH_ERROR) ?
|
|
"Wi-Fi AP password incorrect" : "Wi-Fi AP not found");
|
|
break;
|
|
}
|
|
case WIFI_PROV_CRED_SUCCESS:
|
|
ESP_LOGI(TAG, "Provisioning successful");
|
|
break;
|
|
case WIFI_PROV_END:
|
|
/* De-initialize manager once provisioning is finished */
|
|
wifi_prov_mgr_deinit();
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void wifi_init_sta()
|
|
{
|
|
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
|
|
ESP_ERROR_CHECK(esp_wifi_start());
|
|
}
|
|
|
|
static void get_device_service_name(char *service_name, size_t max)
|
|
{
|
|
uint8_t eth_mac[6];
|
|
const char *ssid_prefix = "PROV_";
|
|
esp_wifi_get_mac(WIFI_IF_STA, eth_mac);
|
|
snprintf(service_name, max, "%s%02X%02X%02X",
|
|
ssid_prefix, eth_mac[3], eth_mac[4], eth_mac[5]);
|
|
}
|
|
|
|
void app_main()
|
|
{
|
|
/* Initialize NVS partition */
|
|
esp_err_t ret = nvs_flash_init();
|
|
if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND) {
|
|
/* NVS partition was truncated
|
|
* and needs to be erased */
|
|
ESP_ERROR_CHECK(nvs_flash_erase());
|
|
|
|
/* Retry nvs_flash_init */
|
|
ESP_ERROR_CHECK(nvs_flash_init());
|
|
}
|
|
|
|
/* Initialize TCP/IP and the event loop */
|
|
tcpip_adapter_init();
|
|
ESP_ERROR_CHECK(esp_event_loop_init(event_handler, NULL));
|
|
wifi_event_group = xEventGroupCreate();
|
|
|
|
/* Initialize Wi-Fi */
|
|
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
|
|
ESP_ERROR_CHECK(esp_wifi_init(&cfg));
|
|
|
|
/* Configuration for the provisioning manager */
|
|
wifi_prov_mgr_config_t config = {
|
|
/* What is the Provisioning Scheme that we want ?
|
|
* wifi_prov_scheme_softap or wifi_prov_scheme_ble */
|
|
.scheme = wifi_prov_scheme_ble,
|
|
|
|
/* Any default scheme specific event handler that you would
|
|
* like to choose. Since our example application requires
|
|
* neither BT nor BLE, we can choose to release the associated
|
|
* memory once provisioning is complete, or not needed
|
|
* (in case when device is already provisioned). Choosing
|
|
* appropriate scheme specific event handler allows the manager
|
|
* to take care of this automatically. This can be set to
|
|
* WIFI_PROV_EVENT_HANDLER_NONE when using wifi_prov_scheme_softap*/
|
|
.scheme_event_handler = WIFI_PROV_SCHEME_BLE_EVENT_HANDLER_FREE_BTDM,
|
|
|
|
/* Do we want an application specific handler be executed on
|
|
* various provisioning related events */
|
|
.app_event_handler = {
|
|
.event_cb = prov_event_handler,
|
|
.user_data = NULL
|
|
}
|
|
};
|
|
|
|
/* Initialize provisioning manager with the
|
|
* configuration parameters set above */
|
|
ESP_ERROR_CHECK(wifi_prov_mgr_init(config));
|
|
|
|
bool provisioned = false;
|
|
/* Let's find out if the device is provisioned */
|
|
ESP_ERROR_CHECK(wifi_prov_mgr_is_provisioned(&provisioned));
|
|
|
|
/* If device is not yet provisioned start provisioning service */
|
|
if (!provisioned) {
|
|
ESP_LOGI(TAG, "Starting provisioning");
|
|
|
|
/* What is the Device Service Name that we want
|
|
* This translates to :
|
|
* - Wi-Fi SSID when scheme is wifi_prov_scheme_softap
|
|
* - device name when scheme is wifi_prov_scheme_ble
|
|
*/
|
|
char service_name[12];
|
|
get_device_service_name(service_name, sizeof(service_name));
|
|
|
|
/* What is the security level that we want (0 or 1):
|
|
* - WIFI_PROV_SECURITY_0 is simply plain text communication.
|
|
* - WIFI_PROV_SECURITY_1 is secure communication which consists of secure handshake
|
|
* using X25519 key exchange and proof of possession (pop) and AES-CTR
|
|
* for encryption/decryption of messages.
|
|
*/
|
|
wifi_prov_security_t security = WIFI_PROV_SECURITY_1;
|
|
|
|
/* Do we want a proof-of-possession (ignored if Security 0 is selected):
|
|
* - this should be a string with length > 0
|
|
* - NULL if not used
|
|
*/
|
|
const char *pop = "abcd1234";
|
|
|
|
/* What is the service key (could be NULL)
|
|
* This translates to :
|
|
* - Wi-Fi password when scheme is wifi_prov_scheme_softap
|
|
* - simply ignored when scheme is wifi_prov_scheme_ble
|
|
*/
|
|
const char *service_key = NULL;
|
|
|
|
/* This step is only useful when scheme is wifi_prov_scheme_ble. This will
|
|
* set a custom 128 bit UUID which will be included in the BLE advertisement
|
|
* and will correspond to the primary GATT service that provides provisioning
|
|
* endpoints as GATT characteristics. Each GATT characteristic will be
|
|
* formed using the primary service UUID as base, with different auto assigned
|
|
* 12th and 13th bytes (assume counting starts from 0th byte). The client side
|
|
* applications must identify the endpoints by reading the User Characteristic
|
|
* Description descriptor (0x2901) for each characteristic, which contains the
|
|
* endpoint name of the characteristic */
|
|
uint8_t custom_service_uuid[] = {
|
|
/* LSB <---------------------------------------
|
|
* ---------------------------------------> MSB */
|
|
0x21, 0x43, 0x65, 0x87, 0x09, 0xba, 0xdc, 0xfe,
|
|
0xef, 0xcd, 0xab, 0x90, 0x78, 0x56, 0x34, 0x12
|
|
};
|
|
wifi_prov_scheme_ble_set_service_uuid(custom_service_uuid);
|
|
|
|
/* Start provisioning service */
|
|
ESP_ERROR_CHECK(wifi_prov_mgr_start_provisioning(security, pop, service_name, service_key));
|
|
|
|
/* Uncomment the following to wait for the provisioning to finish and then release
|
|
* the resources of the manager. Since in this case de-initialization is triggered
|
|
* by the configured prov_event_handler(), we don't need to call the following */
|
|
// wifi_prov_mgr_wait();
|
|
// wifi_prov_mgr_deinit();
|
|
} else {
|
|
ESP_LOGI(TAG, "Already provisioned, starting Wi-Fi STA");
|
|
|
|
/* We don't need the manager as device is already provisioned,
|
|
* so let's release it's resources */
|
|
wifi_prov_mgr_deinit();
|
|
|
|
/* Start Wi-Fi station */
|
|
wifi_init_sta();
|
|
}
|
|
|
|
/* Wait for Wi-Fi connection */
|
|
xEventGroupWaitBits(wifi_event_group, WIFI_CONNECTED_EVENT, false, true, portMAX_DELAY);
|
|
|
|
/* Start main application now */
|
|
while (1) {
|
|
ESP_LOGI(TAG, "Hello World!");
|
|
vTaskDelay(1000 / portTICK_PERIOD_MS);
|
|
}
|
|
}
|