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myesp32tests/examples/http_server.c
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| /* | |
| GPIO control over http server. | |
| Big thanks to esp-idf examples for wifi connecting and lwip httpserver_netconn example | |
| This program is free software: you can redistribute it and/or modify | |
| it under the terms of the GNU General Public License as published by | |
| the Free Software Foundation, either version 3 of the License, or | |
| (at your option) any later version. | |
| This program is distributed in the hope that it will be useful, | |
| but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| GNU General Public License for more details. | |
| You should have received a copy of the GNU General Public License | |
| along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| */ | |
| #include <string.h> | |
| #include "freertos/FreeRTOS.h" | |
| #include "freertos/task.h" | |
| #include "freertos/event_groups.h" | |
| #include "esp_system.h" | |
| #include "esp_wifi.h" | |
| #include "esp_event_loop.h" | |
| #include "esp_log.h" | |
| #include "nvs_flash.h" | |
| #include "driver/gpio.h" | |
| #include "lwip/sys.h" | |
| #include "lwip/netdb.h" | |
| #include "lwip/api.h" | |
| int state = 0; | |
| const static char http_html_hdr[] = "HTTP/1.1 200 OK\r\nContent-type: text/html\r\n\r\n"; | |
| const static char http_index_hml[] = "<html><head><title>Control</title></head><body><h1>Control</h1><a href=\"h\">On</a><br><a href=\"l\">Off</a></body></html>"; | |
| #define EXAMPLE_WIFI_SSID "SSID" | |
| #define EXAMPLE_WIFI_PASS "PASS" | |
| const int DIODE_PIN = 5; | |
| static EventGroupHandle_t wifi_event_group; | |
| const int CONNECTED_BIT = BIT0; | |
| static esp_err_t event_handler(void *ctx, system_event_t *event) | |
| { | |
| switch(event->event_id) { | |
| case SYSTEM_EVENT_STA_START: | |
| esp_wifi_connect(); | |
| break; | |
| case SYSTEM_EVENT_STA_GOT_IP: | |
| xEventGroupSetBits(wifi_event_group, CONNECTED_BIT); | |
| break; | |
| case SYSTEM_EVENT_STA_DISCONNECTED: | |
| /* This is a workaround as ESP32 WiFi libs don't currently | |
| auto-reassociate. */ | |
| esp_wifi_connect(); | |
| xEventGroupClearBits(wifi_event_group, CONNECTED_BIT); | |
| break; | |
| default: | |
| break; | |
| } | |
| return ESP_OK; | |
| } | |
| static void initialise_wifi(void) | |
| { | |
| tcpip_adapter_init(); | |
| wifi_event_group = xEventGroupCreate(); | |
| ESP_ERROR_CHECK( esp_event_loop_init(event_handler, NULL) ); | |
| wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT(); | |
| ESP_ERROR_CHECK( esp_wifi_init(&cfg) ); | |
| ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) ); | |
| wifi_config_t wifi_config = { | |
| .sta = { | |
| .ssid = EXAMPLE_WIFI_SSID, | |
| .password = EXAMPLE_WIFI_PASS, | |
| }, | |
| }; | |
| ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) ); | |
| ESP_ERROR_CHECK( esp_wifi_set_config(WIFI_IF_STA, &wifi_config) ); | |
| ESP_ERROR_CHECK( esp_wifi_start() ); | |
| } | |
| static void | |
| http_server_netconn_serve(struct netconn *conn) | |
| { | |
| struct netbuf *inbuf; | |
| char *buf; | |
| u16_t buflen; | |
| err_t err; | |
| /* Read the data from the port, blocking if nothing yet there. | |
| We assume the request (the part we care about) is in one netbuf */ | |
| err = netconn_recv(conn, &inbuf); | |
| if (err == ERR_OK) { | |
| netbuf_data(inbuf, (void**)&buf, &buflen); | |
| /* Is this an HTTP GET command? (only check the first 5 chars, since | |
| there are other formats for GET, and we're keeping it very simple )*/ | |
| if (buflen>=5 && | |
| buf[0]=='G' && | |
| buf[1]=='E' && | |
| buf[2]=='T' && | |
| buf[3]==' ' && | |
| buf[4]=='/' ) { | |
| printf("%c\n", buf[5]); | |
| /* Send the HTML header | |
| * subtract 1 from the size, since we dont send the \0 in the string | |
| * NETCONN_NOCOPY: our data is const static, so no need to copy it | |
| */ | |
| gpio_pad_select_gpio(DIODE_PIN); | |
| /* Set the GPIO as a push/pull output */ | |
| gpio_set_direction(DIODE_PIN, GPIO_MODE_OUTPUT); | |
| if(buf[5]=='h'){ | |
| gpio_set_level(DIODE_PIN,1); | |
| } | |
| if(buf[5]=='l'){ | |
| gpio_set_level(DIODE_PIN,0); | |
| } | |
| netconn_write(conn, http_html_hdr, sizeof(http_html_hdr)-1, NETCONN_NOCOPY); | |
| /* Send our HTML page */ | |
| netconn_write(conn, http_index_hml, sizeof(http_index_hml)-1, NETCONN_NOCOPY); | |
| } | |
| } | |
| /* Close the connection (server closes in HTTP) */ | |
| netconn_close(conn); | |
| /* Delete the buffer (netconn_recv gives us ownership, | |
| so we have to make sure to deallocate the buffer) */ | |
| netbuf_delete(inbuf); | |
| } | |
| static void http_server(void *pvParameters) | |
| { | |
| struct netconn *conn, *newconn; | |
| err_t err; | |
| conn = netconn_new(NETCONN_TCP); | |
| netconn_bind(conn, NULL, 80); | |
| netconn_listen(conn); | |
| do { | |
| err = netconn_accept(conn, &newconn); | |
| if (err == ERR_OK) { | |
| http_server_netconn_serve(newconn); | |
| netconn_delete(newconn); | |
| } | |
| } while(err == ERR_OK); | |
| netconn_close(conn); | |
| netconn_delete(conn); | |
| } | |
| void app_main() | |
| { | |
| nvs_flash_init(); | |
| system_init(); | |
| initialise_wifi(); | |
| xTaskCreate(&http_server, "http_server", 2048, NULL, 5, NULL); | |
| } |