280 lines
8.4 KiB
C
280 lines
8.4 KiB
C
/* Simple HTTP Server Example
|
|
|
|
This example code is in the Public Domain (or CC0 licensed, at your option.)
|
|
|
|
Unless required by applicable law or agreed to in writing, this
|
|
software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
|
|
CONDITIONS OF ANY KIND, either express or implied.
|
|
*/
|
|
|
|
#include <esp_wifi.h>
|
|
#include <esp_event_loop.h>
|
|
#include <esp_log.h>
|
|
#include <esp_system.h>
|
|
#include <nvs_flash.h>
|
|
#include <sys/param.h>
|
|
|
|
#include <esp_http_server.h>
|
|
|
|
/* A simple example that demonstrates how to create GET and POST
|
|
* handlers for the web server.
|
|
* The examples use simple WiFi configuration that you can set via
|
|
* 'make menuconfig'.
|
|
* If you'd rather not, just change the below entries to strings
|
|
* with the config you want -
|
|
* ie. #define EXAMPLE_WIFI_SSID "mywifissid"
|
|
*/
|
|
#define EXAMPLE_WIFI_SSID CONFIG_WIFI_SSID
|
|
#define EXAMPLE_WIFI_PASS CONFIG_WIFI_PASSWORD
|
|
|
|
static const char *TAG="APP";
|
|
|
|
/* An HTTP GET handler */
|
|
esp_err_t hello_get_handler(httpd_req_t *req)
|
|
{
|
|
char* buf;
|
|
size_t buf_len;
|
|
|
|
/* Get header value string length and allocate memory for length + 1,
|
|
* extra byte for null termination */
|
|
buf_len = httpd_req_get_hdr_value_len(req, "Host") + 1;
|
|
if (buf_len > 1) {
|
|
buf = malloc(buf_len);
|
|
/* Copy null terminated value string into buffer */
|
|
if (httpd_req_get_hdr_value_str(req, "Host", buf, buf_len) == ESP_OK) {
|
|
ESP_LOGI(TAG, "Found header => Host: %s", buf);
|
|
}
|
|
free(buf);
|
|
}
|
|
|
|
buf_len = httpd_req_get_hdr_value_len(req, "Test-Header-2") + 1;
|
|
if (buf_len > 1) {
|
|
buf = malloc(buf_len);
|
|
if (httpd_req_get_hdr_value_str(req, "Test-Header-2", buf, buf_len) == ESP_OK) {
|
|
ESP_LOGI(TAG, "Found header => Test-Header-2: %s", buf);
|
|
}
|
|
free(buf);
|
|
}
|
|
|
|
buf_len = httpd_req_get_hdr_value_len(req, "Test-Header-1") + 1;
|
|
if (buf_len > 1) {
|
|
buf = malloc(buf_len);
|
|
if (httpd_req_get_hdr_value_str(req, "Test-Header-1", buf, buf_len) == ESP_OK) {
|
|
ESP_LOGI(TAG, "Found header => Test-Header-1: %s", buf);
|
|
}
|
|
free(buf);
|
|
}
|
|
|
|
/* Read URL query string length and allocate memory for length + 1,
|
|
* extra byte for null termination */
|
|
buf_len = httpd_req_get_url_query_len(req) + 1;
|
|
if (buf_len > 1) {
|
|
buf = malloc(buf_len);
|
|
if (httpd_req_get_url_query_str(req, buf, buf_len) == ESP_OK) {
|
|
ESP_LOGI(TAG, "Found URL query => %s", buf);
|
|
char param[32];
|
|
/* Get value of expected key from query string */
|
|
if (httpd_query_key_value(buf, "query1", param, sizeof(param)) == ESP_OK) {
|
|
ESP_LOGI(TAG, "Found URL query parameter => query1=%s", param);
|
|
}
|
|
if (httpd_query_key_value(buf, "query3", param, sizeof(param)) == ESP_OK) {
|
|
ESP_LOGI(TAG, "Found URL query parameter => query3=%s", param);
|
|
}
|
|
if (httpd_query_key_value(buf, "query2", param, sizeof(param)) == ESP_OK) {
|
|
ESP_LOGI(TAG, "Found URL query parameter => query2=%s", param);
|
|
}
|
|
}
|
|
free(buf);
|
|
}
|
|
|
|
/* Set some custom headers */
|
|
httpd_resp_set_hdr(req, "Custom-Header-1", "Custom-Value-1");
|
|
httpd_resp_set_hdr(req, "Custom-Header-2", "Custom-Value-2");
|
|
|
|
/* Send response with custom headers and body set as the
|
|
* string passed in user context*/
|
|
const char* resp_str = (const char*) req->user_ctx;
|
|
httpd_resp_send(req, resp_str, strlen(resp_str));
|
|
|
|
/* After sending the HTTP response the old HTTP request
|
|
* headers are lost. Check if HTTP request headers can be read now. */
|
|
if (httpd_req_get_hdr_value_len(req, "Host") == 0) {
|
|
ESP_LOGI(TAG, "Request headers lost");
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
httpd_uri_t hello = {
|
|
.uri = "/hello",
|
|
.method = HTTP_GET,
|
|
.handler = hello_get_handler,
|
|
/* Let's pass response string in user
|
|
* context to demonstrate it's usage */
|
|
.user_ctx = "Hello World!"
|
|
};
|
|
|
|
/* An HTTP POST handler */
|
|
esp_err_t echo_post_handler(httpd_req_t *req)
|
|
{
|
|
char buf[100];
|
|
int ret, remaining = req->content_len;
|
|
|
|
while (remaining > 0) {
|
|
/* Read the data for the request */
|
|
if ((ret = httpd_req_recv(req, buf,
|
|
MIN(remaining, sizeof(buf)))) <= 0) {
|
|
if (ret == HTTPD_SOCK_ERR_TIMEOUT) {
|
|
/* Retry receiving if timeout occurred */
|
|
continue;
|
|
}
|
|
return ESP_FAIL;
|
|
}
|
|
|
|
/* Send back the same data */
|
|
httpd_resp_send_chunk(req, buf, ret);
|
|
remaining -= ret;
|
|
|
|
/* Log data received */
|
|
ESP_LOGI(TAG, "=========== RECEIVED DATA ==========");
|
|
ESP_LOGI(TAG, "%.*s", ret, buf);
|
|
ESP_LOGI(TAG, "====================================");
|
|
}
|
|
|
|
// End response
|
|
httpd_resp_send_chunk(req, NULL, 0);
|
|
return ESP_OK;
|
|
}
|
|
|
|
httpd_uri_t echo = {
|
|
.uri = "/echo",
|
|
.method = HTTP_POST,
|
|
.handler = echo_post_handler,
|
|
.user_ctx = NULL
|
|
};
|
|
|
|
/* An HTTP PUT handler. This demonstrates realtime
|
|
* registration and deregistration of URI handlers
|
|
*/
|
|
esp_err_t ctrl_put_handler(httpd_req_t *req)
|
|
{
|
|
char buf;
|
|
int ret;
|
|
|
|
if ((ret = httpd_req_recv(req, &buf, 1)) <= 0) {
|
|
if (ret == HTTPD_SOCK_ERR_TIMEOUT) {
|
|
httpd_resp_send_408(req);
|
|
}
|
|
return ESP_FAIL;
|
|
}
|
|
|
|
if (buf == '0') {
|
|
/* Handler can be unregistered using the uri string */
|
|
ESP_LOGI(TAG, "Unregistering /hello and /echo URIs");
|
|
httpd_unregister_uri(req->handle, "/hello");
|
|
httpd_unregister_uri(req->handle, "/echo");
|
|
}
|
|
else {
|
|
ESP_LOGI(TAG, "Registering /hello and /echo URIs");
|
|
httpd_register_uri_handler(req->handle, &hello);
|
|
httpd_register_uri_handler(req->handle, &echo);
|
|
}
|
|
|
|
/* Respond with empty body */
|
|
httpd_resp_send(req, NULL, 0);
|
|
return ESP_OK;
|
|
}
|
|
|
|
httpd_uri_t ctrl = {
|
|
.uri = "/ctrl",
|
|
.method = HTTP_PUT,
|
|
.handler = ctrl_put_handler,
|
|
.user_ctx = NULL
|
|
};
|
|
|
|
httpd_handle_t start_webserver(void)
|
|
{
|
|
httpd_handle_t server = NULL;
|
|
httpd_config_t config = HTTPD_DEFAULT_CONFIG();
|
|
|
|
// Start the httpd server
|
|
ESP_LOGI(TAG, "Starting server on port: '%d'", config.server_port);
|
|
if (httpd_start(&server, &config) == ESP_OK) {
|
|
// Set URI handlers
|
|
ESP_LOGI(TAG, "Registering URI handlers");
|
|
httpd_register_uri_handler(server, &hello);
|
|
httpd_register_uri_handler(server, &echo);
|
|
httpd_register_uri_handler(server, &ctrl);
|
|
return server;
|
|
}
|
|
|
|
ESP_LOGI(TAG, "Error starting server!");
|
|
return NULL;
|
|
}
|
|
|
|
void stop_webserver(httpd_handle_t server)
|
|
{
|
|
// Stop the httpd server
|
|
httpd_stop(server);
|
|
}
|
|
|
|
static esp_err_t event_handler(void *ctx, system_event_t *event)
|
|
{
|
|
httpd_handle_t *server = (httpd_handle_t *) ctx;
|
|
|
|
switch(event->event_id) {
|
|
case SYSTEM_EVENT_STA_START:
|
|
ESP_LOGI(TAG, "SYSTEM_EVENT_STA_START");
|
|
ESP_ERROR_CHECK(esp_wifi_connect());
|
|
break;
|
|
case SYSTEM_EVENT_STA_GOT_IP:
|
|
ESP_LOGI(TAG, "SYSTEM_EVENT_STA_GOT_IP");
|
|
ESP_LOGI(TAG, "Got IP: '%s'",
|
|
ip4addr_ntoa(&event->event_info.got_ip.ip_info.ip));
|
|
|
|
/* Start the web server */
|
|
if (*server == NULL) {
|
|
*server = start_webserver();
|
|
}
|
|
break;
|
|
case SYSTEM_EVENT_STA_DISCONNECTED:
|
|
ESP_LOGI(TAG, "SYSTEM_EVENT_STA_DISCONNECTED");
|
|
ESP_ERROR_CHECK(esp_wifi_connect());
|
|
|
|
/* Stop the web server */
|
|
if (*server) {
|
|
stop_webserver(*server);
|
|
*server = NULL;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return ESP_OK;
|
|
}
|
|
|
|
static void initialise_wifi(void *arg)
|
|
{
|
|
tcpip_adapter_init();
|
|
ESP_ERROR_CHECK(esp_event_loop_init(event_handler, arg));
|
|
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_LOGI(TAG, "Setting WiFi configuration SSID %s...", wifi_config.sta.ssid);
|
|
ESP_ERROR_CHECK(esp_wifi_set_mode(WIFI_MODE_STA));
|
|
ESP_ERROR_CHECK(esp_wifi_set_config(ESP_IF_WIFI_STA, &wifi_config));
|
|
ESP_ERROR_CHECK(esp_wifi_start());
|
|
}
|
|
|
|
void app_main()
|
|
{
|
|
static httpd_handle_t server = NULL;
|
|
ESP_ERROR_CHECK(nvs_flash_init());
|
|
initialise_wifi(&server);
|
|
}
|