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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); | |
} |