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Include the WiFi code for convenience.

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RobotMan2412 2022-06-09 08:39:28 +02:00
parent ecc86f8358
commit 1ed24d6faf
5 changed files with 429 additions and 0 deletions
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2
main/CMakeLists.txt
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idf_component_register( idf_component_register(
SRCS SRCS
"main.c" "main.c"
"wifi_connect.c"
"wifi_connection.c"
INCLUDE_DIRS INCLUDE_DIRS
"." "include" "." "include"
) )

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main/include/wifi_connect.h Normal file
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#pragma once
#include <stdbool.h>
bool wifi_connect_to_stored();

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main/include/wifi_connection.h Normal file
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#pragma once
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
#include "esp_wifi.h"
#include "esp_wifi_types.h"
#include "esp_wpa2.h"
#define WIFI_MCH2022_SSID "MCH2022"
#define WIFI_MCH2022_USER "mch2022"
#define WIFI_MCH2022_IDENT "mch2022"
#define WIFI_MCH2022_PASSWORD "mch2022"
#define WIFI_MCH2022_AUTH WIFI_AUTH_WPA2_ENTERPRISE
#define WIFI_MCH2022_PHASE2 ESP_EAP_TTLS_PHASE2_MSCHAPV2
// Simpler interpretation of WiFi signal strength.
typedef enum {
WIFI_STRENGTH_VERY_BAD,
WIFI_STRENGTH_BAD,
WIFI_STRENGTH_GOOD,
WIFI_STRENGTH_VERY_GOOD,
} wifi_strength_t;
// Thresholds for aforementioned signal strength definitions.
#define WIFI_THRESH_BAD -80
#define WIFI_THRESH_GOOD -70
#define WIFI_THRESH_VERY_GOOD -67
// Firt time initialisation of the WiFi stack.
void wifi_init();
// Connect to a traditional username/password WiFi network.
bool wifi_connect(const char* aSsid, const char* aPassword, wifi_auth_mode_t aAuthmode, uint8_t aRetryMax);
// Connect to a WPA2 enterprise WiFi network.
bool wifi_connect_ent(const char* aSsid, const char *aIdent, const char *aAnonIdent, const char* aPassword, esp_eap_ttls_phase2_types phase2, uint8_t aRetryMax);
// Scan for WiFi networks.
// Updates the APs pointer if non-null.
// Returns the number of APs found.
size_t wifi_scan(wifi_ap_record_t **aps);
// Get the strength value for a given RSSI.
wifi_strength_t wifi_rssi_to_strength(int8_t rssi);

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main/wifi_connect.c Normal file
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#include <stdio.h>
#include <string.h>
#include <sdkconfig.h>
#include <freertos/FreeRTOS.h>
#include <freertos/task.h>
#include <freertos/queue.h>
#include <esp_system.h>
#include <esp_err.h>
#include <esp_log.h>
#include <nvs_flash.h>
#include <nvs.h>
#include "pax_gfx.h"
#include "system_wrapper.h"
#include "settings.h"
#include "wifi_connection.h"
static const char *TAG = "wifi_connect";
bool wifi_connect_to_stored() {
bool result = false;
// Open NVS.
nvs_handle_t handle;
nvs_open("system", NVS_READWRITE, &handle);
wifi_auth_mode_t authmode = 0;
esp_eap_ttls_phase2_types phase2 = 0;
char *ssid = NULL;
char *ident = NULL;
char *anon_ident = NULL;
char *password = NULL;
size_t len;
// Read NVS.
esp_err_t res;
// Read SSID.
res = nvs_get_str(handle, "wifi.ssid", NULL, &len);
if (res) goto errcheck;
ssid = malloc(len);
res = nvs_get_str(handle, "wifi.ssid", ssid, &len);
if (res) goto errcheck;
// Check whether connection is enterprise.
res = nvs_get_u8(handle, "wifi.authmode", &authmode);
bool use_ent = authmode == WIFI_AUTH_WPA2_ENTERPRISE;
if (res) goto errcheck;
if (use_ent) {
// Read enterprise-specific parameters.
// Read phase2 mode.
res = nvs_get_u8(handle, "wifi.phase2", &phase2);
if (res) goto errcheck;
// Read identity.
res = nvs_get_str(handle, "wifi.username", NULL, &len);
if (res) goto errcheck;
ident = malloc(len);
res = nvs_get_str(handle, "wifi.username", ident, &len);
// Read anonymous identity.
res = nvs_get_str(handle, "wifi.anon_ident", NULL, &len);
if (res == ESP_ERR_NVS_NOT_FOUND) {
// Default is use the same thing.
anon_ident = strdup(ident);
} else {
if (res) goto errcheck;
anon_ident = malloc(len);
res = nvs_get_str(handle, "wifi.anon_ident", anon_ident, &len);
if (res) goto errcheck;
}
}
// Read password.
res = nvs_get_str(handle, "wifi.password", NULL, &len);
if (res) goto errcheck;
password = malloc(len);
res = nvs_get_str(handle, "wifi.password", password, &len);
if (res) goto errcheck;
// Close NVS.
nvs_close(handle);
// Open the appropriate connection.
if (use_ent) {
result = wifi_connect_ent(ssid, ident, anon_ident, password, phase2, 3);
} else {
result = wifi_connect(ssid, password, authmode, 3);
}
errcheck:
if (res == ESP_ERR_NVS_NOT_FOUND || res == ESP_ERR_NVS_NOT_INITIALIZED) {
// When NVS is not initialised.
ESP_LOGI(TAG, "WiFi settings not stored in NVS.");
} else if (res) {
// Other errors.
ESP_LOGE(TAG, "Error connecting to WiFi: %s", esp_err_to_name(res));
}
// Free memory.
if (ssid) free(ssid);
if (ident) free(ident);
if (anon_ident) free(anon_ident);
if (password) free(password);
return result;
}

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main/wifi_connection.c Normal file
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#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_event.h"
#include "esp_log.h"
#include "lwip/err.h"
#include "lwip/sys.h"
#include "wifi_connection.h"
static const char *TAG = "wifi_connection";
#define WIFI_CONNECTED_BIT BIT0
#define WIFI_FAIL_BIT BIT1
#define WIFI_STARTED_BIT BIT2
static EventGroupHandle_t wifiEventGroup;
static uint8_t retryCount = 0;
static uint8_t maxRetries = 3;
static bool isScanning = false;
static void event_handler(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data) {
if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_START) {
xEventGroupSetBits(wifiEventGroup, WIFI_STARTED_BIT);
if (!isScanning) {
// Connect only if we're not scanning the WiFi.
esp_wifi_connect();
}
ESP_LOGI(TAG, "WiFi station start.");
} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_STOP) {
xEventGroupClearBits(wifiEventGroup, WIFI_STARTED_BIT);
ESP_LOGI(TAG, "WiFi station stop.");
} else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
if (retryCount < 3) {
esp_wifi_connect();
retryCount++;
ESP_LOGI(TAG, "Retrying connection");
} else {
ESP_LOGI(TAG, "Connection failed");
xEventGroupSetBits(wifiEventGroup, WIFI_FAIL_BIT);
}
} 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, "Got ip:" IPSTR, IP2STR(&event->ip_info.ip));
retryCount = 0;
xEventGroupSetBits(wifiEventGroup, WIFI_CONNECTED_BIT);
}
}
void wifi_init() {
// Create an event group for WiFi things.
wifiEventGroup = xEventGroupCreate();
// Initialise WiFi stack.
ESP_ERROR_CHECK(esp_netif_init());
ESP_ERROR_CHECK(esp_event_loop_create_default());
esp_netif_create_default_wifi_sta();
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
ESP_ERROR_CHECK(esp_wifi_init(&cfg));
// Register event handlers for WiFi.
esp_event_handler_instance_t instance_any_id;
esp_event_handler_instance_t instance_got_ip;
ESP_ERROR_CHECK(esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &event_handler, NULL, &instance_any_id));
ESP_ERROR_CHECK(esp_event_handler_instance_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &event_handler, NULL, &instance_got_ip));
// Turn off WiFi hardware.
ESP_ERROR_CHECK(esp_wifi_stop());
}
bool wifi_connect(const char* aSsid, const char* aPassword, wifi_auth_mode_t aAuthmode, uint8_t aRetryMax) {
// Set the retry counts.
retryCount = 0;
maxRetries = aRetryMax;
// Create a config.
wifi_config_t wifi_config = {0};
strcpy((char*) wifi_config.sta.ssid, aSsid);
strcpy((char*) wifi_config.sta.password, aPassword);
wifi_config.sta.threshold.authmode = aAuthmode;
// Set WiFi config.
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config));
// Disable 11b as NOC asked.
esp_wifi_config_11b_rate(WIFI_IF_STA, true);
// Start WiFi.
ESP_ERROR_CHECK(esp_wifi_start());
ESP_LOGI(TAG, "Connecting to WiFi...");
/* Waiting until either the connection is established (WIFI_CONNECTED_BIT) or connection failed for the maximum
* number of re-tries (WIFI_FAIL_BIT). The bits are set by event_handler() (see above) */
EventBits_t bits = xEventGroupWaitBits(wifiEventGroup, WIFI_CONNECTED_BIT | WIFI_FAIL_BIT, pdFALSE, pdFALSE, portMAX_DELAY);
/* xEventGroupWaitBits() returns the bits before the call returned, hence we can test which event actually happened. */
if (bits & WIFI_CONNECTED_BIT) {
ESP_LOGI(TAG, "Connected to WiFi");
return true;
} else if (bits & WIFI_FAIL_BIT) {
ESP_LOGE(TAG, "Failed to connect");
ESP_ERROR_CHECK(esp_wifi_stop());
} else {
ESP_LOGE(TAG, "Unknown event received while waiting on connection");
ESP_ERROR_CHECK(esp_wifi_stop());
}
return false;
}
bool wifi_connect_ent(const char* aSsid, const char *aIdent, const char *aAnonIdent, const char* aPassword, esp_eap_ttls_phase2_types phase2, uint8_t aRetryMax) {
retryCount = 0;
maxRetries = aRetryMax;
wifi_config_t wifi_config = {0};
if (strlen(aSsid) > 32) {
ESP_LOGE(TAG, "SSID is too long (%zu > 32)!", strlen(aSsid));
return false;
}
strncpy((char*) wifi_config.sta.ssid, aSsid, 32);
// Set WiFi config.
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA) );
ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, &wifi_config) );
// Set WPA2 ENT config.
esp_wifi_sta_wpa2_ent_set_identity((const uint8_t *) aAnonIdent, strlen(aAnonIdent));
esp_wifi_sta_wpa2_ent_set_username((const uint8_t *) aIdent, strlen(aIdent));
esp_wifi_sta_wpa2_ent_set_password((const uint8_t *) aPassword, strlen(aPassword));
esp_wifi_sta_wpa2_ent_set_ttls_phase2_method(phase2);
// Enable enterprise auth.
esp_wifi_sta_wpa2_ent_enable();
// Disable 11b as NOC asked.
esp_wifi_config_11b_rate(WIFI_IF_STA, true);
// Start the connection.
esp_wifi_start();
ESP_LOGI(TAG, "Connecting to '%s' as '%s'/'%s': %s", aSsid, aIdent, aAnonIdent, aPassword);
ESP_LOGI(TAG, "Phase2 mode: %d", phase2);
/* Waiting until either the connection is established (WIFI_CONNECTED_BIT) or connection failed for the maximum
* number of re-tries (WIFI_FAIL_BIT). The bits are set by event_handler() (see above) */
EventBits_t bits = xEventGroupWaitBits(wifiEventGroup, WIFI_CONNECTED_BIT | WIFI_FAIL_BIT, pdFALSE, pdFALSE, portMAX_DELAY);
/* xEventGroupWaitBits() returns the bits before the call returned, hence we can test which event actually happened. */
if (bits & WIFI_CONNECTED_BIT) {
ESP_LOGI(TAG, "Connected to WiFi");
return true;
} else if (bits & WIFI_FAIL_BIT) {
ESP_LOGE(TAG, "Failed to connect");
ESP_ERROR_CHECK(esp_wifi_stop());
} else {
ESP_LOGE(TAG, "Unknown event received while waiting on connection");
ESP_ERROR_CHECK(esp_wifi_stop());
}
return false;
}
// Shows a nice info message describing an AP record.
static inline void wifi_desc_record(wifi_ap_record_t *record) {
// Make a string representation of BSSID.
char *bssid_str = malloc(3*6);
if (!bssid_str) return;
snprintf(bssid_str, 3*6, "%02X:%02X:%02X:%02X:%02X:%02X",
record->bssid[0], record->bssid[1], record->bssid[2],
record->bssid[3], record->bssid[4], record->bssid[5]
);
// Make a string representation of 11b/g/n modes.
char *phy_str = malloc(9);
if (!phy_str) {
free(bssid_str);
return;
}
*phy_str = 0;
if (record->phy_11b | record->phy_11g | record->phy_11n) {
strcpy(phy_str, " 1");
}
if (record->phy_11b) {
strcat(phy_str, "/b");
}
if (record->phy_11g) {
strcat(phy_str, "/g");
}
if (record->phy_11n) {
strcat(phy_str, "/n");
}
phy_str[2] = '1';
ESP_LOGI(TAG, "AP %s %s rssi=%hhd%s", bssid_str, record->ssid, record->rssi, phy_str);
free(bssid_str);
free(phy_str);
}
// Scan for WiFi access points.
size_t wifi_scan(wifi_ap_record_t **aps_out) {
isScanning = true;
// Scan for any non-hidden APs on all channels.
wifi_scan_config_t cfg = {
.ssid = NULL,
.bssid = NULL,
.channel = 0,
.scan_type = WIFI_SCAN_TYPE_ACTIVE,
.scan_time = { .active={ 0, 0 } },
};
// Start the scan now.
ESP_LOGI(TAG, "Starting scan...");
esp_err_t res = esp_wifi_scan_start(&cfg, true);
// Whether to call esp_wifi_stop() on finish.
bool stopWhenDone = false;
if (res == ESP_ERR_WIFI_NOT_STARTED) {
// If it complains that the wifi wasn't started, then do so.
ESP_LOGI(TAG, "Starting WiFi for scan");
// Set to station but don't connect.
res = esp_wifi_set_mode(WIFI_MODE_STA);
if (res) goto ohno;
// Start WiFi.
res = esp_wifi_start();
if (res) goto ohno;
stopWhenDone = true;
// Await the STA started bit.
xEventGroupWaitBits(wifiEventGroup, WIFI_STARTED_BIT, pdFALSE, pdFALSE, pdMS_TO_TICKS(2000));
// Try again.
res = esp_wifi_scan_start(&cfg, true);
}
if (res) {
ohno:
ESP_LOGE(TAG, "Error in WiFi scan: %s", esp_err_to_name(res));
isScanning = false;
return 0;
}
// Allocate memory for AP list.
uint16_t num_ap = 0;
esp_wifi_scan_get_ap_num(&num_ap);
wifi_ap_record_t *aps = malloc(sizeof(wifi_ap_record_t) * num_ap);
// Collect APs and report findings.
esp_wifi_scan_get_ap_records(&num_ap, aps);
for (uint16_t i = 0; i < num_ap; i++) {
wifi_desc_record(&aps[i]);
}
// Clean up.
if (aps_out) {
// Output pointer is non-null, return the APs list.
*aps_out = aps;
} else {
// Output pointer is null, free the APs list.
free(aps);
}
if (stopWhenDone) {
// Stop WiFi because it was started only for this scan.
esp_wifi_stop();
}
isScanning = false;
return num_ap;
}
// Get the strength value for a given RSSI.
wifi_strength_t wifi_rssi_to_strength(int8_t rssi) {
if (rssi > WIFI_THRESH_VERY_GOOD) return WIFI_STRENGTH_VERY_GOOD;
else if (rssi > WIFI_THRESH_GOOD) return WIFI_STRENGTH_GOOD;
else if (rssi > WIFI_THRESH_BAD) return WIFI_STRENGTH_BAD;
else return WIFI_STRENGTH_VERY_BAD;
}