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