--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main/task_wifi.c Tue Oct 08 12:00:31 2019 +0200
@@ -0,0 +1,320 @@
+/**
+ * @file task_wifi.c
+ * @brief WiFi task. Connect to the known AP with the strongest signal.
+ */
+
+
+#include "config.h"
+
+
+static const char *TAG = "task_wifi";
+
+
+SemaphoreHandle_t xSemaphoreWiFi = NULL; ///< Semaphore WiFi task.
+EventGroupHandle_t xEventGroupWifi; ///< Events WiFi task.
+uint16_t ap_num = MAX_AP_NUM; ///< Scan counter.
+wifi_ap_record_t *accessp_records; ///< [MAX_AP_NUM] records array with scan results.
+wifi_config_t *task_wifi_ConfigSTA = NULL; ///< Current STA configuration.
+WIFI_State *wifi_state = NULL; ///< Public state for other tasks.
+
+wifi_scan_config_t scan_config = { ///< WiFi scanner configuration.
+ .ssid = 0,
+ .bssid = 0,
+ .channel = 0,
+ .show_hidden = false,
+ .scan_time.passive = 130 ///< Beacons are usually sent every 100 mSec.
+};
+
+uint8_t _wifi_ssid[33]; ///< Current SSID
+bool _wifi_ScanAPs = false; ///< Scanning
+bool _wifi_ScanDone = false; ///< Scan ready
+uint16_t _wifi_Scanned = 0; ///< Total scanned APs.
+
+extern uint32_t TimeSpent; ///< Counter that is increased each second.
+extern bool System_TimeOk;
+extern time_t now;
+extern char strftime_buf[64];
+extern struct tm timeinfo;
+
+const int TASK_WIFI_REQUEST_WIFI_SCAN = BIT0; ///< When set, means a client requested to scan wireless networks.
+const int TASK_WIFI_REQUEST_STA_DISCONNECT = BIT1; ///< When set, means a client requested to disconnect from currently connected AP.
+const int TASK_WIFI_REQUEST_STA_CONNECT = BIT2; ///< When set, means a client requested to connect to an access point.
+
+const int TASK_WIFI_HAS_IP = BIT3; ///< Indicate that we have an IP address
+const int TASK_WIFI_STA_FAILED = BIT4; ///< Indicate that we could not get a connection to AP as station.
+const int TASK_WIFI_STA_DISCONNECTED = BIT5; ///< Indicate that we are disconnected from an ap station.
+const int TASK_WIFI_STA_CONNECTED = BIT6; ///< Indicate that we are connected to AP as station, flip of BIT6.
+
+const int TASK_WIFI_REQUEST_SYSTEM = BIT8; ///< The system needs a connection
+const int TASK_WIFI_REQUEST_USER = BIT9; ///< The user needs a connection
+
+
+/**
+ * @brief local callback function. Is called when the timesync is valid
+ * from a timeserver. Sets the global boolean System_TimeOk value.
+ * @param tv is the received time. Not used.
+ */
+void time_sync_notification_cb(struct timeval *tv);
+
+/**
+ * @brief Array with AP security names
+ */
+const char *apsec[] = { "Open", "WEP", "WPA", "WPA2", "WPA WPA2", "Enterprise" };
+
+
+/****************************************************************************/
+
+
+
+void requestWiFi_system(bool state)
+{
+ if (state)
+ xEventGroupSetBits(xEventGroupWifi, TASK_WIFI_REQUEST_SYSTEM);
+ else
+ xEventGroupClearBits(xEventGroupWifi, TASK_WIFI_REQUEST_SYSTEM);
+
+ if (xEventGroupGetBits(xEventGroupWifi) & (TASK_WIFI_REQUEST_SYSTEM | TASK_WIFI_REQUEST_USER))
+ xEventGroupSetBits(xEventGroupWifi, TASK_WIFI_REQUEST_STA_CONNECT);
+ else
+ xEventGroupSetBits(xEventGroupWifi, TASK_WIFI_REQUEST_STA_DISCONNECT);
+}
+
+
+
+void requestWiFi_user(bool state)
+{
+ if (state)
+ xEventGroupSetBits(xEventGroupWifi, TASK_WIFI_REQUEST_USER);
+ else
+ xEventGroupClearBits(xEventGroupWifi, TASK_WIFI_REQUEST_USER);
+
+ if (xEventGroupGetBits(xEventGroupWifi) & (TASK_WIFI_REQUEST_SYSTEM | TASK_WIFI_REQUEST_USER))
+ xEventGroupSetBits(xEventGroupWifi, TASK_WIFI_REQUEST_STA_CONNECT);
+ else
+ xEventGroupSetBits(xEventGroupWifi, TASK_WIFI_REQUEST_STA_DISCONNECT);
+}
+
+
+
+bool ready_WiFi(void)
+{
+ if (wifi_state->STA_connected && wifi_state->STA_online)
+ return true;
+ return false;
+}
+
+
+
+static void wifi_event_handler(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data)
+{
+ switch (event_id) {
+
+ case WIFI_EVENT_SCAN_DONE:
+ // Get the results so the memory used is freed.
+ ESP_ERROR_CHECK(esp_wifi_scan_get_ap_records(&ap_num, accessp_records));
+ _wifi_Scanned = ap_num;
+ _wifi_ScanDone = true;
+ break;
+
+ case WIFI_EVENT_STA_START:
+ ESP_LOGI(TAG, "Event wifi START");
+ // Set the configured hostname for the dhcp client.
+ ESP_ERROR_CHECK(tcpip_adapter_set_hostname(TCPIP_ADAPTER_IF_STA, config.hostname));
+ esp_wifi_connect();
+ break;
+
+ case WIFI_EVENT_STA_CONNECTED:
+ {
+ wifi_event_sta_connected_t* event = (wifi_event_sta_connected_t*) event_data;
+ wifi_ap_record_t ap_info;
+ esp_wifi_sta_get_ap_info(&ap_info);
+ ESP_LOGI(TAG, "Event STA connected, ssid:%s, bssid:" MACSTR ", channel:%d, rssi: %d, authmode:%s",
+ ap_info.ssid, MAC2STR(ap_info.bssid), event->channel, ap_info.rssi, apsec[event->authmode]);
+ if (xSemaphoreTake(xSemaphoreWiFi, 25) == pdTRUE) {
+ wifi_state->STA_connected = true;
+ wifi_state->STA_rssi = ap_info.rssi;
+ sprintf(wifi_state->STA_ssid, "%s", ap_info.ssid);
+ xSemaphoreGive(xSemaphoreWiFi);
+ }
+ xEventGroupSetBits(xEventGroupWifi, TASK_WIFI_STA_CONNECTED);
+ xEventGroupClearBits(xEventGroupWifi, TASK_WIFI_STA_DISCONNECTED);
+ break;
+ }
+
+ case WIFI_EVENT_STA_DISCONNECTED:
+ {
+ wifi_event_sta_disconnected_t* disconnected = (wifi_event_sta_disconnected_t*) event_data;
+
+ ESP_LOGI(TAG, "Event STA disconnected, ssid:%s, ssid_len:%d, bssid:" MACSTR ", reason:%d",
+ disconnected->ssid, disconnected->ssid_len, MAC2STR(disconnected->bssid), disconnected->reason);
+ if (xSemaphoreTake(xSemaphoreWiFi, 10) == pdTRUE) {
+ wifi_state->STA_connected = false;
+ wifi_state->STA_online = false;
+ wifi_state->STA_rssi = 0;
+ xSemaphoreGive(xSemaphoreWiFi);
+ }
+ xEventGroupClearBits(xEventGroupWifi, TASK_WIFI_STA_CONNECTED);
+ xEventGroupSetBits(xEventGroupWifi, TASK_WIFI_STA_DISCONNECTED);
+ break;
+ }
+
+ default:
+ ESP_LOGI(TAG, "Unknown WiFi event %d", event_id);
+ break;
+ }
+}
+
+
+
+static void got_ip_event_handler(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data)
+{
+ switch (event_id) {
+
+ case IP_EVENT_STA_GOT_IP:
+ xEventGroupSetBits(xEventGroupWifi, TASK_WIFI_HAS_IP);
+ ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
+ if (xSemaphoreTake(xSemaphoreWiFi, 10) == pdTRUE) {
+ wifi_state->STA_online = true;
+ snprintf(wifi_state->STA_ip, 16, "%s", ip4addr_ntoa(&event->ip_info.ip));
+ snprintf(wifi_state->STA_nm, 16, "%s", ip4addr_ntoa(&event->ip_info.netmask));
+ snprintf(wifi_state->STA_gw, 16, "%s", ip4addr_ntoa(&event->ip_info.gw));
+ xSemaphoreGive(xSemaphoreWiFi);
+ }
+ break;
+
+ case IP_EVENT_STA_LOST_IP:
+ ESP_LOGW(TAG, "Lost IP address");
+ xEventGroupClearBits(xEventGroupWifi, TASK_WIFI_HAS_IP);
+ if (xSemaphoreTake(xSemaphoreWiFi, 10) == pdTRUE) {
+ wifi_state->STA_ip[0] = '\0';
+ wifi_state->STA_nm[0] = '\0';
+ wifi_state->STA_gw[0] = '\0';
+ wifi_state->STA_online = false;
+ xSemaphoreGive(xSemaphoreWiFi);
+ }
+ break;
+
+ default:
+ ESP_LOGI(TAG, "Unknown IP event %d", event_id);
+ break;
+ }
+}
+
+
+
+void task_wifi( void * pvParameters )
+{
+ ESP_LOGI(TAG, "Starting WiFi");
+
+ /* event handler and event group for the wifi driver */
+ xEventGroupWifi = xEventGroupCreate();
+ /* initialize the tcp stack */
+ tcpip_adapter_init();
+ ESP_ERROR_CHECK(esp_event_loop_create_default());
+
+ /*
+ * memory allocation of objects used by the task
+ */
+ accessp_records = (wifi_ap_record_t*)malloc(sizeof(wifi_ap_record_t) * MAX_AP_NUM);
+ task_wifi_ConfigSTA = (wifi_config_t*)malloc(sizeof(wifi_config_t));
+ memset(task_wifi_ConfigSTA, 0x00, sizeof(wifi_config_t));
+
+ xSemaphoreWiFi = xSemaphoreCreateMutex();
+ wifi_state = malloc(sizeof(WIFI_State));
+ wifi_state->STA_connected = false;
+ wifi_state->STA_online = false;
+ wifi_state->STA_rssi = 0;
+
+ /* stop dhcp server and start dhcp client */
+ ESP_ERROR_CHECK(tcpip_adapter_dhcps_stop(TCPIP_ADAPTER_IF_AP));
+ ESP_ERROR_CHECK(tcpip_adapter_dhcpc_start(TCPIP_ADAPTER_IF_STA));
+
+ /*
+ * init wifi as station
+ */
+ wifi_init_config_t wifi_init_config = WIFI_INIT_CONFIG_DEFAULT();
+ ESP_ERROR_CHECK(esp_wifi_init(&wifi_init_config));
+
+ ESP_ERROR_CHECK( esp_event_handler_register(WIFI_EVENT, ESP_EVENT_ANY_ID, &wifi_event_handler, NULL) );
+ ESP_ERROR_CHECK( esp_event_handler_register(IP_EVENT, IP_EVENT_STA_GOT_IP, &got_ip_event_handler, NULL) );
+
+ ESP_ERROR_CHECK(esp_wifi_set_storage(WIFI_STORAGE_RAM));
+ ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
+ ESP_ERROR_CHECK(esp_wifi_start());
+
+ xEventGroupSetBits(xEventGroupWifi, TASK_WIFI_STA_DISCONNECTED);
+ EventBits_t uxBits;
+
+ for(;;) {
+
+ /* actions that can trigger: request a connection, a scan, or a disconnection */
+ uxBits = xEventGroupWaitBits(xEventGroupWifi,
+ TASK_WIFI_REQUEST_STA_CONNECT | TASK_WIFI_REQUEST_WIFI_SCAN | TASK_WIFI_REQUEST_STA_DISCONNECT,
+ pdFALSE, pdFALSE, portMAX_DELAY );
+
+ if (uxBits & TASK_WIFI_REQUEST_STA_DISCONNECT) {
+ /*
+ * user requested a disconnect, this will in effect disconnect the wifi
+ */
+ ESP_LOGI(TAG, "Request STA disconnect");
+ ESP_ERROR_CHECK(esp_wifi_disconnect());
+ xEventGroupWaitBits(xEventGroupWifi, TASK_WIFI_STA_DISCONNECTED, pdFALSE, pdTRUE, portMAX_DELAY );
+
+ /* finally: release the scan request bit */
+ xEventGroupClearBits(xEventGroupWifi, TASK_WIFI_REQUEST_STA_DISCONNECT);
+
+ } else if (uxBits & TASK_WIFI_REQUEST_STA_CONNECT) {
+
+ ESP_LOGI(TAG, "Request STA connect");
+ xEventGroupClearBits(xEventGroupWifi, TASK_WIFI_STA_FAILED);
+ _wifi_ScanAPs = true;
+ _wifi_ScanDone = false;
+ ap_num = MAX_AP_NUM;
+ ESP_ERROR_CHECK(esp_wifi_scan_start(&scan_config, false));
+ while (_wifi_ScanDone == false) {
+ vTaskDelay(10 / portTICK_PERIOD_MS);
+ }
+ ESP_LOGI(TAG, "Scan done %d APs", _wifi_Scanned);
+ bool found = false;
+
+ // Available Access Points.
+ for (int i = 0; i < _wifi_Scanned; i++) {
+ wifi_ap_record_t ap = accessp_records[i];
+ // Check if we know this AP in the database.
+// ESP_LOGI(TAG, "%d %-20s ch: %2d rssi: %d %s", i, ap.ssid, ap.primary, ap.rssi, apsec[ap.authmode]);
+ if ((read_station(ap.ssid) >= 0)) {
+ /* ssid */
+ size_t sz = sizeof(task_wifi_ConfigSTA->sta.ssid);
+ memcpy(task_wifi_ConfigSTA->sta.ssid, wifiStation.SSID, sz);
+ /* password */
+ sz = sizeof(task_wifi_ConfigSTA->sta.password);
+ memcpy(task_wifi_ConfigSTA->sta.password, wifiStation.Password, sz);
+ found = true;
+ break;
+ }
+ }
+ if (found) {
+ /*
+ * Now connect to the known SSID
+ */
+ // ESP_LOGI(TAG, "Connecting to `%s'", task_wifi_ConfigSTA->sta.ssid);
+ ESP_ERROR_CHECK(esp_wifi_set_config(WIFI_IF_STA, task_wifi_ConfigSTA));
+ esp_err_t wifierror = esp_wifi_connect();
+ if (wifierror != ESP_OK) {
+ ESP_LOGE(TAG, "esp_wifi_connect() `%s' rc=%04x", task_wifi_ConfigSTA->sta.ssid, (int)wifierror);
+ xEventGroupSetBits(xEventGroupWifi, TASK_WIFI_STA_FAILED);
+ }
+ uxBits = xEventGroupWaitBits(xEventGroupWifi, TASK_WIFI_STA_CONNECTED | TASK_WIFI_STA_FAILED, pdFALSE, pdFALSE, 5000 / portTICK_PERIOD_MS);
+ if (uxBits & TASK_WIFI_STA_CONNECTED)
+ xEventGroupClearBits(xEventGroupWifi, TASK_WIFI_REQUEST_STA_CONNECT); // Only clear when connected.
+ } else {
+ ESP_LOGI(TAG, "No known AP found, scan again");
+ vTaskDelay(3000 / portTICK_PERIOD_MS);
+ }
+ }
+
+ } /* for(;;) */
+ vTaskDelay(10 / portTICK_PERIOD_MS);
+}
+
+