j3d1/esp-open-rtos
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

Merge pull request #418 from apiel/master

Browse source 
Upnp example emulating a Wemo switch
This commit is contained in:
Ruslan V. Uss 2017-07-24 16:26:37 +05:00 committed by GitHub
commit 9523e872f8
8 changed files with 778 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
examples/upnp/Makefile Normal file
View file

@ -0,0 +1,5 @@
PROGRAM=upnp_test
OTA=1
EXTRA_COMPONENTS=extras/rboot-ota
include ../../common.mk

3
examples/upnp/README.md Normal file
View file

@ -0,0 +1,3 @@
# upnp Example
This is an example to generate an upnp server and emulate a WeMo switch recognizable by Amazon echo Dot.

53
examples/upnp/httpd.c Normal file
View file

@ -0,0 +1,53 @@
#include <lwip/api.h>
#include <string.h>
#include <espressif/esp_common.h>
void httpd_task(void *pvParameters)
{
struct netconn *client = NULL;
struct netconn *nc = netconn_new(NETCONN_TCP);
if (nc == NULL) {
printf("Failed to allocate socket\n");
vTaskDelete(NULL);
}
netconn_bind(nc, IP_ADDR_ANY, 80);
netconn_listen(nc);
while (1) {
err_t err = netconn_accept(nc, &client);
if (err == ERR_OK) {
struct netbuf *nb;
if ((err = netconn_recv(client, &nb)) == ERR_OK) {
struct sdk_station_config config;
sdk_wifi_station_get_config(&config);
char * buf =
"<?xml version=\"1.0\" encoding=\"UTF-8\"?>\
<root>\
<device>\
<deviceType>urn:Belkin:device:controllee:1</deviceType>\
<friendlyName>hello</friendlyName>\
<manufacturer>Belkin International Inc.</manufacturer>\
<modelName>Emulated Socket</modelName>\
<modelNumber>3.1415</modelNumber>\
<UDN>uuid:Socket-1_0-38323636-4558-4dda-9188-cda0e6cc3dc0</UDN>\
<serialNumber>221517K0101769</serialNumber>\
<binaryState>0</binaryState>\
<serviceList>\
<service>\
<serviceType>urn:Belkin:service:basicevent:1</serviceType>\
<serviceId>urn:Belkin:serviceId:basicevent1</serviceId>\
<controlURL>/upnp/control/basicevent1</controlURL>\
<eventSubURL>/upnp/event/basicevent1</eventSubURL>\
<SCPDURL>/eventservice.xml</SCPDURL>\
</service>\
</serviceList>\
</device>\
</root>";
netconn_write(client, buf, strlen(buf), NETCONN_COPY);
}
netbuf_delete(nb);
}
printf("Closing connection\n");
netconn_close(client);
netconn_delete(client);
}
}

3
examples/upnp/httpd.h Normal file
View file

@ -0,0 +1,3 @@
#include <lwip/api.h>
void httpd_task(void *pvParameters);

464
examples/upnp/lwipopts.h Normal file
View file

@ -0,0 +1,464 @@
/*
* Copyright (c) 2001-2003 Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
*
* This file is part of the lwIP TCP/IP stack.
*
* Author: Simon Goldschmidt
*
*/
#ifndef __LWIPOPTS_H__
#define __LWIPOPTS_H__
#define LWIP_ESP 1
#define ESP_RTOS 1
#define PBUF_RSV_FOR_WLAN 1
#define EBUF_LWIP 1
#define ESP_TIMEWAIT_THRESHOLD 10000
#define LWIP_TIMEVAL_PRIVATE 0
#define TCP_WND (TCP_MSS * 2)
#define LWIP_IGMP 1
#include <stdint.h>
#include <esp/hwrand.h>
#define LWIP_RAND hwrand
/*
-----------------------------------------------
---------- Platform specific locking ----------
-----------------------------------------------
*/
/**
* SYS_LIGHTWEIGHT_PROT==1: if you want inter-task protection for certain
* critical regions during buffer allocation, deallocation and memory
* allocation and deallocation.
*/
#define SYS_LIGHTWEIGHT_PROT 1
/**
* MEMCPY: override this if you have a faster implementation at hand than the
* one included in your C library
*/
#define MEMCPY(dst,src,len) memcpy(dst,src,len)
/**
* SMEMCPY: override this with care! Some compilers (e.g. gcc) can inline a
* call to memcpy() if the length is known at compile time and is small.
*/
#define SMEMCPY(dst,src,len) memcpy(dst,src,len)
/*
------------------------------------
---------- Memory options ----------
------------------------------------
*/
/**
* MEM_LIBC_MALLOC==1: Use malloc/free/realloc provided by your C-library
* instead of the lwip internal allocator. Can save code size if you
* already use it.
*/
#define MEM_LIBC_MALLOC 1
/**
* MEMP_MEM_MALLOC==1: Use mem_malloc/mem_free instead of the lwip pool allocator.
* Especially useful with MEM_LIBC_MALLOC but handle with care regarding execution
* speed and usage from interrupts!
*/
#define MEMP_MEM_MALLOC 1
/**
* MEM_ALIGNMENT: should be set to the alignment of the CPU
* 4 byte alignment -> #define MEM_ALIGNMENT 4
* 2 byte alignment -> #define MEM_ALIGNMENT 2
*/
#define MEM_ALIGNMENT 4
/*
------------------------------------------------
---------- Internal Memory Pool Sizes ----------
------------------------------------------------
*/
/*
--------------------------------
---------- ARP options -------
--------------------------------
*/
/**
* ARP_QUEUEING==1: Multiple outgoing packets are queued during hardware address
* resolution. By default, only the most recent packet is queued per IP address.
* This is sufficient for most protocols and mainly reduces TCP connection
* startup time. Set this to 1 if you know your application sends more than one
* packet in a row to an IP address that is not in the ARP cache.
*/
#define ARP_QUEUEING 1
/*
--------------------------------
---------- IP options ----------
--------------------------------
*/
/**
* IP_REASSEMBLY==1: Reassemble incoming fragmented IP packets. Note that
* this option does not affect outgoing packet sizes, which can be controlled
* via IP_FRAG.
*/
#define IP_REASSEMBLY 0
/**
* IP_FRAG==1: Fragment outgoing IP packets if their size exceeds MTU. Note
* that this option does not affect incoming packet sizes, which can be
* controlled via IP_REASSEMBLY.
*/
#define IP_FRAG 1
/**
* IP_REASS_MAXAGE: Maximum time (in multiples of IP_TMR_INTERVAL - so seconds, normally)
* a fragmented IP packet waits for all fragments to arrive. If not all fragments arrived
* in this time, the whole packet is discarded.
*/
#define IP_REASS_MAXAGE 3
/**
* IP_REASS_MAX_PBUFS: Total maximum amount of pbufs waiting to be reassembled.
* Since the received pbufs are enqueued, be sure to configure
* PBUF_POOL_SIZE > IP_REASS_MAX_PBUFS so that the stack is still able to receive
* packets even if the maximum amount of fragments is enqueued for reassembly!
*/
#define IP_REASS_MAX_PBUFS 10
/*
----------------------------------
---------- ICMP options ----------
----------------------------------
*/
/*
---------------------------------
---------- RAW options ----------
---------------------------------
*/
/*
----------------------------------
---------- DHCP options ----------
----------------------------------
*/
/**
* LWIP_DHCP==1: Enable DHCP module.
*/
#define LWIP_DHCP 1
#define LWIP_DHCP_BOOTP_FILE 0
/*
------------------------------------
---------- AUTOIP options ----------
------------------------------------
*/
/*
----------------------------------
---------- SNMP options ----------
----------------------------------
*/
/*
----------------------------------
---------- IGMP options ----------
----------------------------------
*/
/*
----------------------------------
---------- DNS options -----------
----------------------------------
*/
/**
* LWIP_DNS==1: Turn on DNS module. UDP must be available for DNS
* transport.
*/
#define LWIP_DNS 1
#define DNS_TABLE_SIZE 1
#define DNS_MAX_NAME_LENGTH 128
/*
---------------------------------
---------- UDP options ----------
---------------------------------
*/
/*
---------------------------------
---------- TCP options ----------
---------------------------------
*/
/**
* TCP_QUEUE_OOSEQ==1: TCP will queue segments that arrive out of order.
* Define to 0 if your device is low on memory.
*/
#define TCP_QUEUE_OOSEQ 0
/*
* LWIP_EVENT_API==1: The user defines lwip_tcp_event() to receive all
* events (accept, sent, etc) that happen in the system.
* LWIP_CALLBACK_API==1: The PCB callback function is called directly
* for the event. This is the default.
*/
#define TCP_MSS 1460
/**
* TCP_MAXRTX: Maximum number of retransmissions of data segments.
*/
#define TCP_MAXRTX 6
/**
* TCP_SYNMAXRTX: Maximum number of retransmissions of SYN segments.
*/
#define TCP_SYNMAXRTX 3
/*
----------------------------------
---------- Pbuf options ----------
----------------------------------
*/
/*
------------------------------------------------
---------- Network Interfaces options ----------
------------------------------------------------
*/
/**
* LWIP_NETIF_TX_SINGLE_PBUF: if this is set to 1, lwIP tries to put all data
* to be sent into one single pbuf. This is for compatibility with DMA-enabled
* MACs that do not support scatter-gather.
* Beware that this might involve CPU-memcpy before transmitting that would not
* be needed without this flag! Use this only if you need to!
*
* @todo: TCP and IP-frag do not work with this, yet:
*/
#define LWIP_NETIF_TX_SINGLE_PBUF 1
/*
------------------------------------
---------- LOOPIF options ----------
------------------------------------
*/
/*
------------------------------------
---------- SLIPIF options ----------
------------------------------------
*/
/*
------------------------------------
---------- Thread options ----------
------------------------------------
*/
/**
* TCPIP_THREAD_STACKSIZE: The stack size used by the main tcpip thread.
* The stack size value itself is platform-dependent, but is passed to
* sys_thread_new() when the thread is created.
*/
#define TCPIP_THREAD_STACKSIZE 512 //not ok:384
/**
* TCPIP_THREAD_PRIO: The priority assigned to the main tcpip thread.
* The priority value itself is platform-dependent, but is passed to
* sys_thread_new() when the thread is created.
*/
#define TCPIP_THREAD_PRIO (configMAX_PRIORITIES-5)
/**
* TCPIP_MBOX_SIZE: The mailbox size for the tcpip thread messages
* The queue size value itself is platform-dependent, but is passed to
* sys_mbox_new() when tcpip_init is called.
*/
#define TCPIP_MBOX_SIZE 16
/**
* DEFAULT_UDP_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
* NETCONN_UDP. The queue size value itself is platform-dependent, but is passed
* to sys_mbox_new() when the recvmbox is created.
*/
#define DEFAULT_UDP_RECVMBOX_SIZE 6
/**
* DEFAULT_TCP_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
* NETCONN_TCP. The queue size value itself is platform-dependent, but is passed
* to sys_mbox_new() when the recvmbox is created.
*/
#define DEFAULT_TCP_RECVMBOX_SIZE 6
/**
* DEFAULT_ACCEPTMBOX_SIZE: The mailbox size for the incoming connections.
* The queue size value itself is platform-dependent, but is passed to
* sys_mbox_new() when the acceptmbox is created.
*/
#define DEFAULT_ACCEPTMBOX_SIZE 6
/*
----------------------------------------------
---------- Sequential layer options ----------
----------------------------------------------
*/
/*
------------------------------------
---------- Socket options ----------
------------------------------------
*/
/**
* LWIP_SO_SNDTIMEO==1: Enable send timeout for sockets/netconns and
* SO_SNDTIMEO processing.
*/
#define LWIP_SO_SNDTIMEO 1
/**
* LWIP_SO_RCVTIMEO==1: Enable receive timeout for sockets/netconns and
* SO_RCVTIMEO processing.
*/
#define LWIP_SO_RCVTIMEO 1
/**
* LWIP_TCP_KEEPALIVE==1: Enable TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT
* options processing. Note that TCP_KEEPIDLE and TCP_KEEPINTVL have to be set
* in seconds. (does not require sockets.c, and will affect tcp.c)
*/
#define LWIP_TCP_KEEPALIVE 1
/**
* LWIP_SO_RCVBUF==1: Enable SO_RCVBUF processing.
*/
#define LWIP_SO_RCVBUF 0
/**
* SO_REUSE==1: Enable SO_REUSEADDR option.
*/
#define SO_REUSE 1
/*
----------------------------------------
---------- Statistics options ----------
----------------------------------------
*/
/*
---------------------------------
---------- PPP options ----------
---------------------------------
*/
/*
--------------------------------------
---------- Checksum options ----------
--------------------------------------
*/
/*
---------------------------------------
---------- IPv6 options ---------------
---------------------------------------
*/
/*
---------------------------------------
---------- Hook options ---------------
---------------------------------------
*/
/*
---------------------------------------
---------- Debugging options ----------
---------------------------------------
*/
// Uncomment this line, and set the individual debug options you want, for IP stack debug output
//#define LWIP_DEBUG
/**
* ETHARP_DEBUG: Enable debugging in etharp.c.
*/
#define ETHARP_DEBUG LWIP_DBG_OFF
/**
* PBUF_DEBUG: Enable debugging in pbuf.c.
*/
#define PBUF_DEBUG LWIP_DBG_OFF
/**
* API_LIB_DEBUG: Enable debugging in api_lib.c.
*/
#define API_LIB_DEBUG LWIP_DBG_OFF
/**
* SOCKETS_DEBUG: Enable debugging in sockets.c.
*/
#define SOCKETS_DEBUG LWIP_DBG_OFF
/**
* IP_DEBUG: Enable debugging for IP.
*/
#define IP_DEBUG LWIP_DBG_OFF
/**
* MEMP_DEBUG: Enable debugging in memp.c.
*/
#define MEMP_DEBUG LWIP_DBG_OFF
/**
* TCP_INPUT_DEBUG: Enable debugging in tcp_in.c for incoming debug.
*/
#define TCP_INPUT_DEBUG LWIP_DBG_OFF
/**
* TCP_OUTPUT_DEBUG: Enable debugging in tcp_out.c output functions.
*/
#define TCP_OUTPUT_DEBUG LWIP_DBG_OFF
/**
* UDP_DEBUG: Enable debugging in udp.c.
*/
#define UDP_DEBUG LWIP_DBG_OFF
/**
* ICMP_DEBUG: Enable debugging in udp.c.
*/
#define ICMP_DEBUG LWIP_DBG_OFF
/**
* TCPIP_DEBUG: Enable debugging in tcpip.c.
*/
#define TCPIP_DEBUG LWIP_DBG_OFF
/**
* DHCP_DEBUG: Enable debugging in dhcp.c.
*/
#define DHCP_DEBUG LWIP_DBG_OFF
#define LWIP_POSIX_SOCKETS_IO_NAMES 0
#endif /* __LWIPOPTS_H__ */

134
examples/upnp/upnp.c Normal file
View file

@ -0,0 +1,134 @@
#include <string.h>
#include <lwip/udp.h>
#include <lwip/igmp.h>
#include <espressif/esp_common.h>
#include "upnp.h"
#define UPNP_MCAST_GRP ("239.255.255.250")
#define UPNP_MCAST_PORT (1900)
static const char* get_my_ip(void)
{
static char ip[16] = "0.0.0.0";
ip[0] = 0;
struct ip_info ipinfo;
(void) sdk_wifi_get_ip_info(STATION_IF, &ipinfo);
snprintf(ip, sizeof(ip), IPSTR, IP2STR(&ipinfo.ip));
return (char*) ip;
}
/**
* @brief This function joins a multicast group witht he specified ip/port
* @param group_ip the specified multicast group ip
* @param group_port the specified multicast port number
* @param recv the lwip UDP callback
* @retval udp_pcb* or NULL if joining failed
*/
static struct udp_pcb* mcast_join_group(char *group_ip, uint16_t group_port, void (* recv)(void * arg, struct udp_pcb * upcb, struct pbuf * p, struct ip_addr * addr, u16_t port))
{
bool status = false;
struct udp_pcb *upcb;
printf("Joining mcast group %s:%d\n", group_ip, group_port);
do {
upcb = udp_new();
if (!upcb) {
printf("Error, udp_new failed");
break;
}
udp_bind(upcb, IP_ADDR_ANY, group_port);
struct netif* netif = sdk_system_get_netif(STATION_IF);
if (!netif) {
printf("Error, netif is null");
break;
}
if (!(netif->flags & NETIF_FLAG_IGMP)) {
netif->flags |= NETIF_FLAG_IGMP;
igmp_start(netif);
}
ip_addr_t ipgroup;
ipaddr_aton(group_ip, &ipgroup);
err_t err = igmp_joingroup(&netif->ip_addr, &ipgroup);
if(ERR_OK != err) {
printf("Failed to join multicast group: %d", err);
break;
}
status = true;
} while(0);
if (status) {
printf("Join successs\n");
udp_recv(upcb, recv, upcb);
} else {
if (upcb) {
udp_remove(upcb);
}
upcb = NULL;
}
return upcb;
}
static void send(struct udp_pcb *upcb, struct ip_addr *addr, u16_t port)
{
struct pbuf *p;
char msg[500];
snprintf(msg, sizeof(msg),
"HTTP/1.1 200 OK\r\n"
"CACHE-CONTROL: max-age=86400\r\n"
"DATE: Fri, 15 Apr 2016 04:56:29 GMT\r\n"
"EXT:\r\n"
"LOCATION: http://%s:80/setup.xml\r\n"
"OPT: \"http://schemas.upnp.org/upnp/1/0/\"; ns=01\r\n"
"01-NLS: b9200ebb-736d-4b93-bf03-835149d13983\r\n"
"SERVER: Unspecified, UPnP/1.0, Unspecified\r\n"
"ST: urn:Belkin:device:**\r\n"
"USN: uuid:Socket-1_0-38323636-4558-4dda-9188-cda0e6cc3dc0::urn:Belkin:device:**\r\n"
"X-User-Agent: redsonic\r\n\r\n", get_my_ip());
p = pbuf_alloc(PBUF_TRANSPORT, strlen(msg)+1, PBUF_RAM);
if (!p) {
printf("Failed to allocate transport buffer\n");
} else {
memcpy(p->payload, msg, strlen(msg)+1);
err_t err = udp_sendto(upcb, p, addr, port);
if (err < 0) {
printf("Error sending message: %s (%d)\n", lwip_strerr(err), err);
} else {
printf("Sent message '%s'\n", msg);
}
pbuf_free(p);
}
}
/**
* @brief This function is called when an UDP datagrm has been received on the port UDP_PORT.
* @param arg user supplied argument (udp_pcb.recv_arg)
* @param pcb the udp_pcb which received data
* @param p the packet buffer that was received
* @param addr the remote IP address from which the packet was received
* @param port the remote port from which the packet was received
* @retval None
*/
static void receive_callback(void *arg, struct udp_pcb *upcb, struct pbuf *p, struct ip_addr *addr, u16_t port)
{
if (p) {
printf("Msg received port:%d len:%d\n", port, p->len);
uint8_t *buf = (uint8_t*) p->payload;
printf("Msg received port:%d len:%d\nbuf: %s\n", port, p->len, buf);
send(upcb, addr, port);
pbuf_free(p);
}
}
/**
* @brief Initialize the upnp server
* @retval true if init was succcessful
*/
bool upnp_server_init(void)
{
struct udp_pcb *upcb = mcast_join_group(UPNP_MCAST_GRP, UPNP_MCAST_PORT, receive_callback);
return (upcb != NULL);
}

2
examples/upnp/upnp.h Normal file
View file

@ -0,0 +1,2 @@
bool upnp_server_init(void);

114
examples/upnp/upnp_test.c Normal file
View file

@ -0,0 +1,114 @@
#include <esp8266.h>
#include <espressif/esp_common.h>
#include <stdint.h>
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <esp8266.h>
#include <esp/uart.h>
#include <stdio.h>
#include <FreeRTOS.h>
#include <semphr.h>
#include <task.h>
#include <timers.h>
#include <queue.h>
#include <ota-tftp.h>
#include <rboot-api.h>
#include <lwip/pbuf.h>
#include <lwip/udp.h>
#include <lwip/tcp.h>
#include <lwip/ip_addr.h>
#include <lwip/api.h>
#include <lwip/netbuf.h>
#include <lwip/igmp.h>
#include <ssid_config.h>
#include <espressif/esp_wifi.h>
#include "lwipopts.h"
#include "upnp.h"
#include "httpd.h"
/** User friendly FreeRTOS delay macro */
#define delay_ms(ms) vTaskDelay(ms / portTICK_PERIOD_MS)
/** Semaphore to signal wifi availability */
static SemaphoreHandle_t wifi_alive;
/**
* @brief This is the multicast task
* @param arg user supplied argument from xTaskCreate
* @retval None
*/
static void mcast_task(void *arg)
{
xSemaphoreTake(wifi_alive, portMAX_DELAY);
xSemaphoreGive(wifi_alive);
(void) upnp_server_init();
while(1) {
delay_ms(2000);
}
}
/**
* @brief This is the wifi connection task
* @param arg user supplied argument from xTaskCreate
* @retval None
*/
static void wifi_task(void *pvParameters)
{
uint8_t status = 0;
uint8_t retries = 30;
struct sdk_station_config config = {
.ssid = WIFI_SSID,
.password = WIFI_PASS,
};
xSemaphoreTake(wifi_alive, portMAX_DELAY);
printf("WiFi: connecting to WiFi\n");
sdk_wifi_set_opmode(STATION_MODE);
sdk_wifi_station_set_config(&config);
while(1) {
while (status != STATION_GOT_IP && retries) {
status = sdk_wifi_station_get_connect_status();
if(status == STATION_WRONG_PASSWORD) {
printf("WiFi: wrong password\n");
break;
} else if(status == STATION_NO_AP_FOUND) {
printf("WiFi: AP not found\n");
break;
} else if(status == STATION_CONNECT_FAIL) {
printf("WiFi: connection failed\n");
break;
}
delay_ms(1000);
retries--;
}
if (status == STATION_GOT_IP) {
printf("WiFi: connected\n");
xSemaphoreGive(wifi_alive);
taskYIELD();
}
while ((status = sdk_wifi_station_get_connect_status()) == STATION_GOT_IP) {
xSemaphoreGive(wifi_alive);
taskYIELD();
}
printf("WiFi: disconnected\n");
sdk_wifi_station_disconnect();
delay_ms(1000);
}
}
void user_init(void)
{
uart_set_baud(0, 115200);
vSemaphoreCreateBinary(wifi_alive);
ota_tftp_init_server(TFTP_PORT);
xTaskCreate(&wifi_task, "wifi_task", 256, NULL, 2, NULL);
delay_ms(250);
xTaskCreate(&httpd_task, "http_server", 1024, NULL, 4, NULL);
xTaskCreate(&mcast_task, "mcast_task", 1024, NULL, 4, NULL);
}