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This commit is contained in:
Wolfgang Hottgenroth
2021-03-09 14:27:15 +01:00
parent 16c6fb2a01
commit 6896222332
4 changed files with 262 additions and 247 deletions
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src/main/network_mngr.c Normal file
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/*
Taken from
Wi-Fi Provisioning Manager Example
of ESP-IDF 4.3
*/
#include <stdio.h>
#include <string.h>
#include <stdbool.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.h>
#include <nvs_flash.h>
#include <wifi_provisioning/manager.h>
#include <wifi_provisioning/scheme_ble.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 void event_handler(void* arg, esp_event_base_t event_base,
int32_t event_id, void* event_data)
{
if (event_base == WIFI_PROV_EVENT) {
switch (event_id) {
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;
ESP_LOGI(TAG, "Received Wi-Fi credentials"
"\n\tSSID : %s\n\tPassword : %s",
(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 station authentication failed" : "Wi-Fi access-point 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;
}
} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
esp_wifi_connect();
} else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
ESP_LOGI(TAG, "Connected with IP Address:" IPSTR, IP2STR(&event->ip_info.ip));
/* Signal main application to continue execution */
xEventGroupSetBits(wifi_event_group, WIFI_CONNECTED_EVENT);
} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
ESP_LOGI(TAG, "Disconnected. Connecting to the AP again...");
esp_wifi_connect();
}
}
static void wifi_init_sta(void)
{
/* Start Wi-Fi in station mode */
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]);
}
/* Handler for the optional provisioning endpoint registered by the application.
* The data format can be chosen by applications. Here, we are using plain ascii text.
* Applications can choose to use other formats like protobuf, JSON, XML, etc.
*/
esp_err_t custom_prov_data_handler(uint32_t session_id, const uint8_t *inbuf, ssize_t inlen,
uint8_t **outbuf, ssize_t *outlen, void *priv_data)
{
if (inbuf) {
ESP_LOGI(TAG, "Received data: %.*s", inlen, (char *)inbuf);
}
char response[] = "SUCCESS";
*outbuf = (uint8_t *)strdup(response);
if (*outbuf == NULL) {
ESP_LOGE(TAG, "System out of memory");
return ESP_ERR_NO_MEM;
}
*outlen = strlen(response) + 1; /* +1 for NULL terminating byte */
return ESP_OK;
}
void networkInit(bool forceProv)
{
/* Initialize TCP/IP */
ESP_ERROR_CHECK(esp_netif_init());
/* Initialize the event loop */
ESP_ERROR_CHECK(esp_event_loop_create_default());
wifi_event_group = xEventGroupCreate();
/* Register our event handler for Wi-Fi, IP and Provisioning related events */
ESP_ERROR_CHECK(esp_event_handler_register(WIFI_PROV_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL));
ESP_ERROR_CHECK(esp_event_handler_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL));
ESP_ERROR_CHECK(esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL));
/* Initialize Wi-Fi including netif with default config */
esp_netif_create_default_wifi_sta();
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
};
/* 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 (forceProv || !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 */
0xb4, 0xdf, 0x5a, 0x1c, 0x3f, 0x6b, 0xf4, 0xbf,
0xea, 0x4a, 0x82, 0x03, 0x04, 0x90, 0x1a, 0x02,
};
wifi_prov_scheme_ble_set_service_uuid(custom_service_uuid);
/* An optional endpoint that applications can create if they expect to
* get some additional custom data during provisioning workflow.
* The endpoint name can be anything of your choice.
* This call must be made before starting the provisioning.
*/
wifi_prov_mgr_endpoint_create("custom-data");
/* Start provisioning service */
ESP_ERROR_CHECK(wifi_prov_mgr_start_provisioning(security, pop, service_name, service_key));
/* The handler for the optional endpoint created above.
* This call must be made after starting the provisioning, and only if the endpoint
* has already been created above.
*/
wifi_prov_mgr_endpoint_register("custom-data", custom_prov_data_handler, NULL);
/* 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 default event loop 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);
}