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connect to existing APs

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This commit is contained in:
Thaddeus Hughes
2026-03-11 10:45:18 -05:00
parent af02fbb117
commit a9fbd69262
4 changed files with 185 additions and 143 deletions
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7
TODO.md
View File

@@ -12,4 +12,9 @@
- [test] Renaming wifi (should reboot the wifi/web comms to take effect)
- [x] Make sure external RTC crystal is actually in use
- [x] Warn if time is de-synced from client by more than 5 minutes
- [ ] Bluetooth pairing
- [x] Bluetooth pairing
- [ ] WiFi Network Connection
- add entries for wifi network ssid/password
- try to connect to the wifi network first
- if that fails then broadcast ad-hoc network like currently
- [ ] Hard Reset

4
main/comms.c
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@@ -345,7 +345,9 @@ esp_err_t comms_handle_post(cJSON *root, cJSON **response_json) {
if (param_idx == PARAM_WIFI_SSID ||
param_idx == PARAM_WIFI_PASS ||
param_idx == PARAM_WIFI_CHANNEL) {
param_idx == PARAM_WIFI_CHANNEL ||
param_idx == PARAM_NET_SSID ||
param_idx == PARAM_NET_PASS) {
wifi_params_changed = true;
}

2
main/storage.h
View File

@@ -88,6 +88,8 @@ typedef struct {
PARAM_DEF(CHG_BULK_S, u32, 20, "s") \
PARAM_DEF(RF_PULSE_LENGTH, u32, 350000, "us") \
PARAM_DEF(V_SENS_OFFSET, f32, 0.4, "V") \
PARAM_DEF(NET_SSID, str, "", "") \
PARAM_DEF(NET_PASS, str, "", "") \
PARAM_DEF(WIFI_CHANNEL, u16, 6, "") \
PARAM_DEF(WIFI_SSID, str, "sc.local", "") \
PARAM_DEF(WIFI_PASS, str, "password", "") \

293
main/webserver.c
View File

@@ -20,6 +20,7 @@
#include "string.h"
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_task_wdt.h"
#include "esp_wifi.h"
#include "esp_system.h"
#include "esp_event.h"
@@ -823,6 +824,12 @@ httpd_uri_t uris[] = {{
bool server_running = false;
static bool s_wifi_running = false;
static esp_netif_t *s_ap_netif = NULL;
static esp_netif_t *s_sta_netif = NULL;
static bool s_wifi_initted = false;
static SemaphoreHandle_t s_sta_sem = NULL;
static bool s_sta_connected = false;
static esp_err_t start_http_server(void) {
if (server_running) return ESP_OK;
ESP_LOGI(TAG, "STARTING HTTP");
@@ -877,177 +884,234 @@ static esp_err_t stop_http_server(void) {
return ESP_OK;
}
/* Event handler for WiFi events */
/* Event handler for WiFi + IP events */
int n_connected = 0;
static void wifi_event_handler(void* arg, esp_event_base_t event_base,
int32_t event_id, void* event_data) {
if (event_id == WIFI_EVENT_AP_STACONNECTED) {
wifi_event_ap_staconnected_t* event = (wifi_event_ap_staconnected_t*) event_data;
ESP_LOGI(TAG, "Station connected, AID=%d", event->aid);
rtc_reset_shutdown_timer();
n_connected ++;
if (n_connected > 0)
start_http_server();
} else if (event_id == WIFI_EVENT_AP_STADISCONNECTED) {
wifi_event_ap_stadisconnected_t* event = (wifi_event_ap_stadisconnected_t*) event_data;
ESP_LOGI(TAG, "Station disconnected, AID=%d", event->aid);
n_connected --;
if (n_connected <= 0)
stop_http_server();
int32_t event_id, void* event_data) {
if (event_base == WIFI_EVENT) {
if (event_id == WIFI_EVENT_AP_STACONNECTED) {
wifi_event_ap_staconnected_t* event = (wifi_event_ap_staconnected_t*) event_data;
ESP_LOGI(TAG, "Station connected, AID=%d", event->aid);
rtc_reset_shutdown_timer();
n_connected++;
if (n_connected > 0) start_http_server();
} else if (event_id == WIFI_EVENT_AP_STADISCONNECTED) {
wifi_event_ap_stadisconnected_t* event = (wifi_event_ap_stadisconnected_t*) event_data;
ESP_LOGI(TAG, "Station disconnected, AID=%d", event->aid);
n_connected--;
if (n_connected <= 0) stop_http_server();
} else if (event_id == WIFI_EVENT_STA_DISCONNECTED) {
s_sta_connected = false;
if (s_sta_sem) xSemaphoreGive(s_sta_sem);
}
} else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
ip_event_got_ip_t *e = (ip_event_got_ip_t *)event_data;
ESP_LOGI(TAG, "STA connected, IP: " IPSTR, IP2STR(&e->ip_info.ip));
s_sta_connected = true;
if (s_sta_sem) xSemaphoreGive(s_sta_sem);
}
}
static esp_err_t launch_soft_ap(void) {
esp_err_t err;
/* One-time WiFi driver + event system init (guarded by s_wifi_initted) */
static esp_err_t wifi_common_init(void) {
if (s_wifi_initted) return ESP_OK;
ESP_LOGI(TAG, "AP LAUNCHING");
ESP_LOGI(TAG, "AP LAUNCHING...");
err = esp_netif_init();
esp_err_t err = esp_netif_init();
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to initialize netif: %s", esp_err_to_name(err));
ESP_LOGE(TAG, "esp_netif_init failed: %s", esp_err_to_name(err));
return err;
}
err = esp_event_loop_create_default();
if (err != ESP_OK && err != ESP_ERR_INVALID_STATE) {
ESP_LOGE(TAG, "Failed to create event loop: %s", esp_err_to_name(err));
ESP_LOGE(TAG, "esp_event_loop_create_default failed: %s", esp_err_to_name(err));
return err;
}
esp_netif_t *ap_netif = esp_netif_create_default_wifi_ap();
if (ap_netif == NULL) {
ESP_LOGE(TAG, "Failed to create default WiFi AP interface");
return ESP_FAIL;
}
err = esp_netif_set_hostname(ap_netif, HOSTNAME);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to set hostname: %s", esp_err_to_name(err));
// Non-critical, continue
}
wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
err = esp_wifi_init(&cfg);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to initialize WiFi: %s", esp_err_to_name(err));
ESP_LOGE(TAG, "esp_wifi_init failed: %s", esp_err_to_name(err));
return err;
}
err = esp_event_handler_instance_register(WIFI_EVENT,
ESP_EVENT_ANY_ID,
&wifi_event_handler,
NULL,
NULL);
err = esp_event_handler_instance_register(WIFI_EVENT, ESP_EVENT_ANY_ID,
&wifi_event_handler, NULL, NULL);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to register event handler: %s", esp_err_to_name(err));
ESP_LOGE(TAG, "Failed to register WIFI_EVENT handler: %s", esp_err_to_name(err));
return err;
}
err = esp_event_handler_instance_register(IP_EVENT, IP_EVENT_STA_GOT_IP,
&wifi_event_handler, NULL, NULL);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to register IP_EVENT handler: %s", esp_err_to_name(err));
return err;
}
s_wifi_initted = true;
return ESP_OK;
}
/* Attempt STA connection; blocks up to 10 s. Returns ESP_OK on GOT_IP. */
static esp_err_t try_connect_sta(const char *ssid, const char *pass) {
if (s_sta_netif == NULL) {
s_sta_netif = esp_netif_create_default_wifi_sta();
if (s_sta_netif == NULL) {
ESP_LOGE(TAG, "Failed to create STA netif");
return ESP_FAIL;
}
esp_netif_set_hostname(s_sta_netif, HOSTNAME);
}
esp_err_t err = wifi_common_init();
if (err != ESP_OK) return err;
wifi_config_t sta_cfg = {};
strlcpy((char *)sta_cfg.sta.ssid, ssid, sizeof(sta_cfg.sta.ssid));
strlcpy((char *)sta_cfg.sta.password, pass ? pass : "", sizeof(sta_cfg.sta.password));
err = esp_wifi_set_mode(WIFI_MODE_STA);
if (err != ESP_OK) { ESP_LOGE(TAG, "set_mode STA: %s", esp_err_to_name(err)); return err; }
err = esp_wifi_set_config(WIFI_IF_STA, &sta_cfg);
if (err != ESP_OK) { ESP_LOGE(TAG, "set_config STA: %s", esp_err_to_name(err)); return err; }
err = esp_wifi_start();
if (err != ESP_OK) { ESP_LOGE(TAG, "wifi_start: %s", esp_err_to_name(err)); return err; }
s_sta_connected = false;
if (s_sta_sem == NULL) {
s_sta_sem = xSemaphoreCreateBinary();
} else {
xSemaphoreTake(s_sta_sem, 0); // drain any stale token
}
err = esp_wifi_connect();
if (err != ESP_OK) {
ESP_LOGE(TAG, "wifi_connect: %s", esp_err_to_name(err));
esp_wifi_stop();
return err;
}
/* Poll in 100 ms slices so the task watchdog gets reset each iteration.
* A single 10 s block would fire the 10 s WDT because webserver_init()
* runs in app_main before the main loop starts resetting it. */
for (int i = 0; i < 100 && !s_sta_connected; i++) {
if (xSemaphoreTake(s_sta_sem, pdMS_TO_TICKS(100)) == pdTRUE) break;
esp_task_wdt_reset();
}
if (!s_sta_connected) {
ESP_LOGW(TAG, "STA connection timed out or rejected");
esp_wifi_stop();
return ESP_FAIL;
}
s_wifi_running = true;
return ESP_OK;
}
static esp_err_t launch_soft_ap(void) {
ESP_LOGI(TAG, "AP LAUNCHING");
if (s_ap_netif == NULL) {
s_ap_netif = esp_netif_create_default_wifi_ap();
if (s_ap_netif == NULL) {
ESP_LOGE(TAG, "Failed to create default WiFi AP interface");
return ESP_FAIL;
}
esp_netif_set_hostname(s_ap_netif, HOSTNAME);
}
esp_err_t err = wifi_common_init();
if (err != ESP_OK) return err;
wifi_config_t wifi_config = {
.ap = {
.channel = get_param_value_t(PARAM_WIFI_CHANNEL).i16,
.channel = get_param_value_t(PARAM_WIFI_CHANNEL).u16,
.max_connection = 4,
.authmode = WIFI_AUTH_WPA2_PSK
.authmode = WIFI_AUTH_WPA2_PSK,
},
};
// Get the strings from your parameter system
char* ssid_str = get_param_string(PARAM_WIFI_SSID);
char* password_str = get_param_string(PARAM_WIFI_PASS);
char *ssid_str = get_param_string(PARAM_WIFI_SSID);
char *password_str = get_param_string(PARAM_WIFI_PASS);
if (ssid_str == NULL || password_str == NULL) {
ESP_LOGE(TAG, "Failed to get WiFi credentials from parameters");
return ESP_FAIL;
}
// Allocate and set the SSID and password
memcpy(wifi_config.ap.ssid, ssid_str, MIN(strlen(ssid_str), sizeof(wifi_config.ap.ssid)));
memcpy(wifi_config.ap.ssid, ssid_str, MIN(strlen(ssid_str), sizeof(wifi_config.ap.ssid)));
memcpy(wifi_config.ap.password, password_str, MIN(strlen(password_str), sizeof(wifi_config.ap.password)));
// password minimum length of 8
if (strlen(password_str) < 8) {
ESP_LOGW(TAG, "Password too short, using open authentication");
wifi_config.ap.password[0] = '\0';
wifi_config.ap.authmode = WIFI_AUTH_OPEN;
}
// Validate WiFi channel
if (wifi_config.ap.channel > 11 || wifi_config.ap.channel < 1) {
ESP_LOGW(TAG, "Invalid WiFi channel %d, using default channel 6",
wifi_config.ap.channel);
ESP_LOGW(TAG, "Invalid WiFi channel %d, using default channel 6", wifi_config.ap.channel);
wifi_config.ap.channel = 6;
}
// Set the length of SSID
wifi_config.ap.ssid_len = strlen(ssid_str);
err = esp_wifi_set_mode(WIFI_MODE_AP);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to set WiFi mode: %s", esp_err_to_name(err));
return err;
}
if (err != ESP_OK) { ESP_LOGE(TAG, "set_mode AP: %s", esp_err_to_name(err)); return err; }
err = esp_wifi_set_config(WIFI_IF_AP, &wifi_config);
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to set WiFi config: %s", esp_err_to_name(err));
return err;
}
if (err != ESP_OK) { ESP_LOGE(TAG, "set_config AP: %s", esp_err_to_name(err)); return err; }
err = esp_wifi_start();
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to start WiFi: %s", esp_err_to_name(err));
return err;
}
if (err != ESP_OK) { ESP_LOGE(TAG, "wifi_start: %s", esp_err_to_name(err)); return err; }
s_wifi_running = true;
// Start DNS server with your specific hostname
err = simple_dns_server_start("192.168.4.1");
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to start DNS server: %s", esp_err_to_name(err));
// Non-critical, continue
}
// Start mDNS for .local domain
err = mdns_init();
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to initialize mDNS: %s", esp_err_to_name(err));
// Non-critical, continue
} else {
err = mdns_hostname_set(HOSTNAME);
if (err != ESP_OK) {
ESP_LOGW(TAG, "Failed to set mDNS hostname: %s", esp_err_to_name(err));
}
err = mdns_instance_name_set("ClusterCommand");
if (err != ESP_OK) {
ESP_LOGW(TAG, "Failed to set mDNS instance name: %s", esp_err_to_name(err));
}
err = mdns_service_add(NULL, "_http", "_tcp", 80, NULL, 0);
if (err != ESP_OK) {
ESP_LOGW(TAG, "Failed to add mDNS service: %s", esp_err_to_name(err));
}
mdns_hostname_set(HOSTNAME);
mdns_instance_name_set("ClusterCommand");
mdns_service_add(NULL, "_http", "_tcp", 80, NULL, 0);
}
uint8_t *placeholder = (wifi_config.ap.authmode == WIFI_AUTH_OPEN)
? (uint8_t*)"<open network>"
? (uint8_t *)"<open network>"
: wifi_config.ap.password;
ESP_LOGI(TAG, "SoftAP ready. SSID: %s, Channel: %d, Password: %s",
wifi_config.ap.ssid, wifi_config.ap.channel, placeholder);
ESP_LOGI(TAG, "Access at: http://%s or http://%s.local or http://192.168.4.1",
HOSTNAME, HOSTNAME);
ESP_LOGI(TAG, "Access at: http://%s.local or http://192.168.4.1", HOSTNAME);
return ESP_OK;
}
/* STA-first startup: try NET_SSID, fall back to softAP on failure/empty. */
static esp_err_t start_wifi(void) {
char *net_ssid = get_param_string(PARAM_NET_SSID);
if (net_ssid && strlen(net_ssid) > 0) {
char *net_pass = get_param_string(PARAM_NET_PASS);
ESP_LOGI(TAG, "Trying STA connection to '%s'...", net_ssid);
if (try_connect_sta(net_ssid, net_pass) == ESP_OK) {
ESP_LOGI(TAG, "STA connected — HTTP server running");
return ESP_OK;
}
ESP_LOGW(TAG, "STA failed — falling back to softAP");
/* try_connect_sta already called esp_wifi_stop() on failure */
}
return launch_soft_ap();
}
esp_err_t webserver_stop(void) {
stop_http_server();
if (s_wifi_running) {
@@ -1058,7 +1122,7 @@ esp_err_t webserver_stop(void) {
}
esp_err_t webserver_restart_wifi(void) {
ESP_LOGI(TAG, "Restarting WiFi AP with updated params...");
ESP_LOGI(TAG, "Restarting WiFi with updated params...");
stop_http_server();
if (s_wifi_running) {
@@ -1066,53 +1130,22 @@ esp_err_t webserver_restart_wifi(void) {
s_wifi_running = false;
}
wifi_config_t wifi_config = {
.ap = {
.channel = get_param_value_t(PARAM_WIFI_CHANNEL).u16,
.max_connection = 4,
.authmode = WIFI_AUTH_WPA2_PSK,
},
};
char *ssid_str = get_param_string(PARAM_WIFI_SSID);
char *pass_str = get_param_string(PARAM_WIFI_PASS);
memcpy(wifi_config.ap.ssid, ssid_str, MIN(strlen(ssid_str), sizeof(wifi_config.ap.ssid)));
memcpy(wifi_config.ap.password, pass_str, MIN(strlen(pass_str), sizeof(wifi_config.ap.password)));
wifi_config.ap.ssid_len = strlen(ssid_str);
if (strlen(pass_str) < 8) {
wifi_config.ap.password[0] = '\0';
wifi_config.ap.authmode = WIFI_AUTH_OPEN;
}
if (wifi_config.ap.channel < 1 || wifi_config.ap.channel > 11)
wifi_config.ap.channel = 6;
esp_wifi_set_config(WIFI_IF_AP, &wifi_config);
esp_wifi_start();
s_wifi_running = true;
start_http_server();
ESP_LOGI(TAG, "WiFi AP restarted. New SSID: %s, Channel: %d",
wifi_config.ap.ssid, wifi_config.ap.channel);
esp_err_t err = start_wifi();
if (err != ESP_OK) return err;
start_http_server(); // no-op if STA path already started it
return ESP_OK;
}
esp_err_t webserver_init(void) {
ESP_LOGI(TAG, "Initializing webserver...");
// Initialize comms module
esp_err_t err = launch_soft_ap();
esp_err_t err = start_wifi();
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to launch SoftAP: %s", esp_err_to_name(err));
ESP_LOGE(TAG, "Failed to start WiFi: %s", esp_err_to_name(err));
return err;
}
ESP_LOGI(TAG, "AP LAUNCHED");
err = start_http_server();
if (err != ESP_OK) {
ESP_LOGE(TAG, "Failed to start HTTP server: %s", esp_err_to_name(err));
return err;
}
start_http_server(); // no-op if STA path already started it
ESP_LOGI(TAG, "Webserver initialization complete");
return ESP_OK;