Sample code below is based on ESP8266_NONOS_SDK.
If using espconn in ESP8266_RTOS_SDK, please call espconn_init in user_init as initialization.
Create a UDP listening on ESP8266，if ESP8266 got UDP message "Are You ESP8266 Device?"，it will response "Yes,I'm ESP8266!" with its MAC address and IP address
- UDP_Test.png (12.31 KiB) Viewed 26434 times
Code: Select all
/******************************************************************************
* Copyright 2013-2014 Espressif Systems
*
*******************************************************************************/
#include "ets_sys.h"
#include "os_type.h"
#include "osapi.h"
#include "mem.h"
#include "user_interface.h"
#include "espconn.h"
#include "user_json.h"
#include "user_devicefind.h"
const char *device_find_request = "Are You ESP8266 Device?";
const char *device_find_response_ok = "Yes,I'm ESP8266!";
/*---------------------------------------------------------------------------*/
LOCAL struct espconn ptrespconn;
/******************************************************************************
* FunctionName : user_devicefind_recv
* Description : Processing the received udp packet
* Parameters : arg -- Additional argument to pass to the callback function
* pusrdata -- The received data (or NULL when the connection has been closed!)
* length -- The length of received data
* Returns : none
*******************************************************************************/
LOCAL void ICACHE_FLASH_ATTR
user_udp_recv(void *arg, char *pusrdata, unsigned short length)
{
char DeviceBuffer[40] = {0};
char Device_mac_buffer[60] = {0};
char hwaddr[6];
struct ip_info ipconfig;
if (wifi_get_opmode() != STATION_MODE)
{
wifi_get_ip_info(SOFTAP_IF, &ipconfig);
wifi_get_macaddr(SOFTAP_IF, hwaddr);
if (!ip_addr_netcmp((struct ip_addr *)ptrespconn.proto.udp->remote_ip, &ipconfig.ip, &ipconfig.netmask))
{
//udp packet is received from ESP8266 station
wifi_get_ip_info(STATION_IF, &ipconfig);
wifi_get_macaddr(STATION_IF, hwaddr);
}
else
{
//udp packet is received from ESP8266 softAP
}
}
else
{
//udp packet is received from ESP8266 station
wifi_get_ip_info(STATION_IF, &ipconfig);
wifi_get_macaddr(STATION_IF, hwaddr);
}
if (pusrdata == NULL)
return;
if (length == os_strlen(device_find_request) &&
os_strncmp(pusrdata, device_find_request, os_strlen(device_find_request)) == 0)
{
//received device find message
os_sprintf(DeviceBuffer, "%s" MACSTR " " IPSTR, device_find_response_ok,
MAC2STR(hwaddr), IP2STR(&ipconfig.ip));
os_printf("%s\n", DeviceBuffer);
length = os_strlen(DeviceBuffer);
//if received "Are You ESP8266 ?" , response "Yes,I'm ESP8266!" + ESP8266 mac + ESP8266 ip
espconn_sent(&ptrespconn, DeviceBuffer, length);
}
else
{
//received some other data
}
}
/******************************************************************************
* FunctionName : user_devicefind_init
* Description : create a udp listening
* Parameters : none
* Returns : none
*******************************************************************************/
void ICACHE_FLASH_ATTR
user_udp_init(void)
{
ptrespconn.type = ESPCONN_UDP;
ptrespconn.proto.udp = (esp_udp *)os_zalloc(sizeof(esp_udp));
ptrespconn.proto.udp->local_port = 1025; // ESP8266 udp port
espconn_regist_recvcb(&ptrespconn, user_udp_recv); // register a udp packet receiving callback
espconn_create(&ptrespconn); // create udp
}
/******************************************************************************
* FunctionName : user_init
* Description : entry of user application, init user function here
* Parameters : none
* Returns : none
*******************************************************************************/
void user_init(void)
{
os_printf("SDK version:%s\n", system_get_sdk_version());
//Set softAP + station mode
wifi_set_opmode(STATIONAP_MODE);
// Create udp listening.
user_udp_init();
}
