HTTP server (#324)

extras/httpd and http_server example
2017-01-27 08:38:01 +00:00 · 2017-01-27 08:38:01 +00:00 · f64935eb1d
commit f64935eb1d
parent ebfbc1144c
19 changed files with 5050 additions and 0 deletions
--- a/examples/http_server/http_server.c
+++ b/examples/http_server/http_server.c
@ -0,0 +1,114 @@
+/*
+ * HTTP server example.
+ *
+ * This sample code is in the public domain.
+ */
+#include <espressif/esp_common.h>
+#include <esp8266.h>
+#include <esp/uart.h>
+#include <string.h>
+#include <stdio.h>
+#include <FreeRTOS.h>
+#include <task.h>
+#include <ssid_config.h>
+#include <httpd/httpd.h>
+
+#define LED_PIN 2
+
+enum {
+    SSI_UPTIME,
+    SSI_FREE_HEAP,
+    SSI_LED_STATE
+};
+
+char *gpio_cgi_handler(int iIndex, int iNumParams, char *pcParam[], char *pcValue[])
+{
+    for (int i = 0; i < iNumParams; i++) {
+        if (strcmp(pcParam[i], "on") == 0) {
+            uint8_t gpio_num = atoi(pcValue[i]);
+            gpio_enable(gpio_num, GPIO_OUTPUT);
+            gpio_write(gpio_num, true);
+        } else if (strcmp(pcParam[i], "off") == 0) {
+            uint8_t gpio_num = atoi(pcValue[i]);
+            gpio_enable(gpio_num, GPIO_OUTPUT);
+            gpio_write(gpio_num, false);
+        } else if (strcmp(pcParam[i], "toggle") == 0) {
+            uint8_t gpio_num = atoi(pcValue[i]);
+            gpio_enable(gpio_num, GPIO_OUTPUT);
+            gpio_toggle(gpio_num);
+        }
+    }
+    return "/index.ssi";
+}
+
+char *about_cgi_handler(int iIndex, int iNumParams, char *pcParam[], char *pcValue[])
+{
+    return "/about.html";
+}
+
+int32_t ssi_handler(int32_t iIndex, char *pcInsert, int32_t iInsertLen)
+{
+    switch (iIndex) {
+        case SSI_UPTIME:
+            snprintf(pcInsert, iInsertLen, "%d",
+                    xTaskGetTickCount() * portTICK_PERIOD_MS / 1000);
+            break;
+        case SSI_FREE_HEAP:
+            snprintf(pcInsert, iInsertLen, "%d", (int) xPortGetFreeHeapSize());
+            break;
+        case SSI_LED_STATE:
+            snprintf(pcInsert, iInsertLen, (GPIO.OUT & BIT(LED_PIN)) ? "Off" : "On");
+            break;
+        default:
+            snprintf(pcInsert, iInsertLen, "N/A");
+            break;
+    }
+
+    /* Tell the server how many characters to insert */
+    return (strlen(pcInsert));
+}
+
+void httpd_task(void *pvParameters)
+{
+    tCGI pCGIs[] = {
+        {"/gpio", (tCGIHandler) gpio_cgi_handler},
+        {"/about", (tCGIHandler) about_cgi_handler},
+    };
+
+    const char *pcConfigSSITags[] = {
+        "uptime", // SSI_UPTIME
+        "heap",   // SSI_FREE_HEAP
+        "led"     // SSI_LED_STATE
+    };
+
+    /* register handlers and start the server */
+    http_set_cgi_handlers(pCGIs, sizeof (pCGIs) / sizeof (pCGIs[0]));
+    http_set_ssi_handler((tSSIHandler) ssi_handler, pcConfigSSITags,
+            sizeof (pcConfigSSITags) / sizeof (pcConfigSSITags[0]));
+    httpd_init();
+
+    for (;;);
+}
+
+void user_init(void)
+{
+    uart_set_baud(0, 115200);
+    printf("SDK version:%s\n", sdk_system_get_sdk_version());
+
+    struct sdk_station_config config = {
+        .ssid = WIFI_SSID,
+        .password = WIFI_PASS,
+    };
+
+    /* required to call wifi_set_opmode before station_set_config */
+    sdk_wifi_set_opmode(STATION_MODE);
+    sdk_wifi_station_set_config(&config);
+    sdk_wifi_station_connect();
+
+    /* turn off LED */
+    gpio_enable(LED_PIN, GPIO_OUTPUT);
+    gpio_write(LED_PIN, true);
+
+    /* initialize tasks */
+    xTaskCreate(&httpd_task, "HTTP Daemon", 1024, NULL, 2, NULL);
+}