lwip http server, can't read from socket
Posted: Sun Oct 30, 2016 5:29 pm
So today I tried to create a litte http server, but I got stuck when reading from the accepted sockt. I don't know if this is directly esp related, but the lwip examples from the internet are supposed to work.
This gives me some console output, but it hangs on reading.
When I connect via netcat:
Thanks.
Code: Select all
/* Hello World 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 <stdio.h>
#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/ledc.h"
#include "lwip/err.h"
#include "lwip/arch.h"
#include "lwip/api.h"
/* FreeRTOS event group to signal when we are connected & ready to make a request */
static EventGroupHandle_t wifi_event_group;
/* The event group allows multiple bits for each event,
but we only care about one event - are we connected
to the AP with an IP? */
static const int CONNECTED_BIT = BIT0;
static const char *TAG = "example";
/* 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 "miau"
#define EXAMPLE_WIFI_PASS "**EDITED**"
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_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(WIFI_IF_STA, &wifi_config));
ESP_ERROR_CHECK(esp_wifi_start());
}
#ifndef HTTPD_DEBUG
#define HTTPD_DEBUG LWIP_DBG_OFF
#endif
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_html[] =
"<html><head><title>Congrats!</title></head><body><h1>Welcome to our lwIP HTTP server!</h1><p>This is a small test page, served by httpserver-netconn.</body></html>";
const static char reply[] = "Ok, here you go";
/** Serve one HTTP connection accepted in the http thread */
static void http_server_netconn_serve(struct netconn *conn) {
struct netbuf *inbuf;
char *buf;
uint16_t buflen;
err_t err;
/**
* THIS DOES NOT BELONG HERE
* It's just to make sure, the socket can be written to.
*/
netconn_write(conn, reply, sizeof(reply) - 1,
NETCONN_NOCOPY);
/* Read the data from the port, blocking if nothing yet there.
We assume the request (the part we care about) is in one netbuf */
printf("About to read from socket\n");
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] == '/') {
/* 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
*/
netconn_write(conn, http_html_hdr, sizeof(http_html_hdr) - 1,
NETCONN_NOCOPY);
/* Send our HTML page */
netconn_write(conn, http_index_html, sizeof(http_index_html) - 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);
}
/** The main function, never returns! */
static void http_server_netconn_thread(void *arg) {
struct netconn *conn, *newconn;
err_t err;
LWIP_UNUSED_ARG(arg);
/* Create a new TCP connection handle */
conn = netconn_new(NETCONN_TCP);
LWIP_ERROR("http_server: invalid conn", (conn != NULL), return;);
/* Bind to port 80 (HTTP) with default IP address */
netconn_bind(conn, NULL, 80);
/* Put the connection into LISTEN state */
netconn_listen(conn);
do {
err = netconn_accept(conn, &newconn);
if (err == ERR_OK) {
printf("Connection accepted\n");
http_server_netconn_serve(newconn);
netconn_delete(newconn);
}
} while (err == ERR_OK); LWIP_DEBUGF(HTTPD_DEBUG,
("http_server_netconn_thread: netconn_accept received error %d, shutting down",
err));
netconn_close(conn);
netconn_delete(conn);
}
void app_main() {
nvs_flash_init();
system_init();
initialise_wifi();
//xTaskCreate(&hello_task, "hello_task", 2048, NULL, 5, NULL);
xTaskCreate(&http_server_netconn_thread, "http_server_netconn_thread", 2048,
NULL, 5, NULL);
}
Code: Select all
rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
ets Jun 8 2016 00:22:57
rst:0x10 (RTCWDT_RTC_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0x00
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:2
load:0x3ffc0000,len:0
load:0x3ffc0000,len:920
load:0x40078000,len:2836
ho 0 tail 12 room 4
load:0x40098000,len:692
entry 0x4009813c
I (95) heap_alloc_caps: Initializing heap allocator:
I (95) heap_alloc_caps: Region 19: 3FFC0E88 len 0001F178 tag 0
I (96) heap_alloc_caps: Region 25: 3FFE8000 len 00018000 tag 1
I (106) cpu_start: Pro cpu up.
I (111) cpu_start: Starting app cpu, entry point is 0x40080af0
I (0) cpu_start: App cpu up.
I (126) cpu_start: Pro cpu start user code
rtc v112 Sep 26 2016 22:32:10
XTAL 40M
I (162) cpu_start: Starting scheduler on PRO CPU.
I (42) cpu_start: Starting scheduler on APP CPU.
frc2_timer_task_hdl:3ffc5414, prio:22, stack:2048
tcpip_task_hdlxxx : 3ffc5f74, prio:18,stack:2048
phy_version: 123, Sep 13 2016, 20:01:58, 0
pp_task_hdl : 3ffc97c8, prio:23, stack:8192
I (3412) example: Setting WiFi configuration SSID miau...
mode : sta(24:0a:c4:01:be:f0)
n:1 1, o:1 0, ap:255 255, sta:1 1, prof:1
state: 0 -> 2 (b0)
state: 2 -> 3 (0)
state: 3 -> 5 (10)
add 0
connected with miau, channel 1
I (11982) event: ip: 192.168.2.111, mask: 255.255.255.0, gw: 192.168.2.1
Connection accepted
About to read from socket
But I can type and send whatever I want, read() or recv() won't get it.nc 192.168.2.111 80
Ok, here you go
I suppose for me an working example of listen -> accept -> read with esp32 would be sufficient, so any ideas are welcome.nc 192.168.2.111 80
Ok, here you go
GET / HTTP/1.0
Thanks.