From d4b8a916a435cbd079572e385c75935dc54e43aa Mon Sep 17 00:00:00 2001 From: Angus Gratton Date: Wed, 21 Sep 2016 14:57:02 +1000 Subject: [PATCH] examples: HTTP request example --- examples/02_http_request/Makefile | 9 + examples/02_http_request/README.md | 5 + .../02_http_request/main/Kconfig.projbuild | 17 ++ examples/02_http_request/main/component.mk | 10 ++ .../02_http_request/main/http_request_main.c | 159 ++++++++++++++++++ 5 files changed, 200 insertions(+) create mode 100644 examples/02_http_request/Makefile create mode 100644 examples/02_http_request/README.md create mode 100644 examples/02_http_request/main/Kconfig.projbuild create mode 100644 examples/02_http_request/main/component.mk create mode 100644 examples/02_http_request/main/http_request_main.c diff --git a/examples/02_http_request/Makefile b/examples/02_http_request/Makefile new file mode 100644 index 0000000000..2625075074 --- /dev/null +++ b/examples/02_http_request/Makefile @@ -0,0 +1,9 @@ +# +# This is a project Makefile. It is assumed the directory this Makefile resides in is a +# project subdirectory. +# + +PROJECT_NAME := http-request + +include $(IDF_PATH)/make/project.mk + diff --git a/examples/02_http_request/README.md b/examples/02_http_request/README.md new file mode 100644 index 0000000000..1e1bd3d26a --- /dev/null +++ b/examples/02_http_request/README.md @@ -0,0 +1,5 @@ +# HTTP Request Example + +Uses a POSIX socket to make a very simple HTTP request. + +See the README.md file in the upper level 'examples' directory for more information about examples. diff --git a/examples/02_http_request/main/Kconfig.projbuild b/examples/02_http_request/main/Kconfig.projbuild new file mode 100644 index 0000000000..c5d5523a9f --- /dev/null +++ b/examples/02_http_request/main/Kconfig.projbuild @@ -0,0 +1,17 @@ +menu "Example Configuration" + +config WIFI_SSID + string "WiFi SSID" + default "myssid" + help + SSID (network name) for the example to connect to. + +config WIFI_PASSWORD + string "WiFi Password" + default "myssid" + help + WiFi password (WPA or WPA2) for the example to use. + + Can be left blank if the network has no security set. + +endmenu \ No newline at end of file diff --git a/examples/02_http_request/main/component.mk b/examples/02_http_request/main/component.mk new file mode 100644 index 0000000000..24356f23ed --- /dev/null +++ b/examples/02_http_request/main/component.mk @@ -0,0 +1,10 @@ +# +# Main Makefile. This is basically the same as a component makefile. +# +# This Makefile should, at the very least, just include $(SDK_PATH)/make/component_common.mk. By default, +# this will take the sources in the src/ directory, compile them and link them into +# lib(subdirectory_name).a in the build directory. This behaviour is entirely configurable, +# please read the ESP-IDF documents if you need to do this. +# + +include $(IDF_PATH)/make/component_common.mk diff --git a/examples/02_http_request/main/http_request_main.c b/examples/02_http_request/main/http_request_main.c new file mode 100644 index 0000000000..8360c9e51e --- /dev/null +++ b/examples/02_http_request/main/http_request_main.c @@ -0,0 +1,159 @@ +/* HTTP GET Example using plain POSIX sockets + + 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 +#include "freertos/FreeRTOS.h" +#include "freertos/task.h" +#include "esp_wifi.h" +#include "esp_event.h" +#include "esp_log.h" + +#include "lwip/err.h" +#include "lwip/sockets.h" +#include "lwip/sys.h" +#include "lwip/netdb.h" +#include "lwip/dns.h" + +/* 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 + +/* Flag for when we are connected & ready to make a request */ +static volatile bool ready; + +/* Constants that aren't configurable in menuconfig */ +#define WEB_SERVER "example.com" +#define WEB_PORT 80 +#define WEB_URL "http://example.com/" + +static const char *TAG = "example"; + +static const char *REQUEST = "GET " WEB_URL " HTTP/1.1\n" + "Host: "WEB_SERVER"\n" + "User-Agent: esp-idf/1.0 esp32\n" + "\n"; + +static esp_err_t wifi_event_cb(void *ctx, system_event_t *event) +{ + switch(event->event_id) { + case SYSTEM_EVENT_STA_GOT_IP: + ready = true; + break; + case SYSTEM_EVENT_STA_DISCONNECTED: + ready = false; + break; + default: + break; + } + return ESP_OK; +} + +static void set_wifi_configuration(void) +{ + 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_wifi_set_mode(WIFI_MODE_STA); + esp_wifi_set_config(WIFI_IF_STA, &wifi_config); +} + +static void http_get_task(void *pvParameters) +{ + const struct addrinfo hints = { + .ai_family = AF_INET, + .ai_socktype = SOCK_STREAM, + }; + struct addrinfo *res; + struct in_addr *addr; + int s, r; + char recv_buf[64]; + + while(1) { + esp_wifi_connect(); + /* Wait for the event callback to tell us we are connected */ + while (!ready) { + vTaskDelay(1); + } + ESP_LOGI(TAG, "Connected to AP"); + + int err = getaddrinfo(WEB_SERVER, "80", &hints, &res); + + if(err != 0 || res == NULL) { + ESP_LOGE(TAG, "DNS lookup failed err=%d res=%p", err, res); + vTaskDelay(1000 / portTICK_RATE_MS); + continue; + } + + /* Code to print the resolved IP. + + Note: inet_ntoa is non-reentrant, look at ipaddr_ntoa_r for "real" code */ + addr = &((struct sockaddr_in *)res->ai_addr)->sin_addr; + ESP_LOGI(TAG, "DNS lookup succeeded. IP=%s", inet_ntoa(*addr)); + + s = socket(res->ai_family, res->ai_socktype, 0); + if(s < 0) { + ESP_LOGE(TAG, "... Failed to allocate socket."); + freeaddrinfo(res); + vTaskDelay(1000 / portTICK_RATE_MS); + continue; + } + ESP_LOGI(TAG, "... allocated socket\r\n"); + + if(connect(s, res->ai_addr, res->ai_addrlen) != 0) { + ESP_LOGE(TAG, "... socket connect failed errno=%d", errno); + close(s); + freeaddrinfo(res); + vTaskDelay(4000 / portTICK_RATE_MS); + continue; + } + + ESP_LOGI(TAG, "... connected"); + freeaddrinfo(res); + + if (write(s, REQUEST, strlen(REQUEST)) < 0) { + ESP_LOGE(TAG, "... socket send failed"); + close(s); + vTaskDelay(4000 / portTICK_RATE_MS); + continue; + } + ESP_LOGI(TAG, "... socket send success"); + + /* Read HTTP response */ + do { + bzero(recv_buf, sizeof(recv_buf)); + r = read(s, recv_buf, sizeof(recv_buf)-1); + for(int i = 0; i < r; i++) { + putchar(recv_buf[i]); + } + } while(r > 0); + + ESP_LOGI(TAG, "... done reading from socket. Last read return=%d errno=%d\r\n", r, errno); + close(s); + for(int countdown = 10; countdown >= 0; countdown--) { + ESP_LOGI(TAG, "%d... ", countdown); + vTaskDelay(1000 / portTICK_RATE_MS); + } + ESP_LOGI(TAG, "Starting again!"); + } +} + +void app_main() +{ + esp_event_set_cb(wifi_event_cb, NULL); + set_wifi_configuration(); + xTaskCreate(&http_get_task, "http_get_task", 2048, NULL, 5, NULL); +}