esp8266 - udp (send, receive)

https://python-dds.tistory.com/entry/Python-UDP-send-receive

Python - UDP (send, receive)

Code

//==NodeMCU==START
#define D0 (16)
#define D1 (5) //SCL
#define D2 (4) //SDA
#define D3 (0)
#define D4 (2)
#define D5 (14)
#define D6 (12)
#define D7 (13)
#define D8 (15)
 
#define SD0 (7)
#define SD1 (8)
#define SD2 (9)
#define SD3 (10)
//==NodeMCU==END
 
//==WIFI==START
#include <ESP8266WiFi.h>
const char* ssid = "xxxx-xxx";
const char* password = "xxxxxxxxxx";
//==WIFI==END
 
 
//==LED BLINK==START
#define BUILTIN_LED     D4
volatile bool statusLed = false;
//==LED BLINK==END
 
 
//==TIME_LOOP==START
#include <time.h>
#include <sys/time.h>
 
timeval tv;
 
int now_second;
void loop_time()
{ 
  gettimeofday(&tv, nullptr);
  static time_t lastv = 0;
  if (lastv != tv.tv_sec) {    
    lastv = tv.tv_sec;   
    now_second = (lastv % 60);
//==UDP==START        
    udp_send((String)udp_print_info());
//==UDP==END    
  }
}
//==TIME_LOOP==END
 
//==UDP==START
#include <WiFiUdp.h>
#define UDP_SEND_PORT 54321
#define UDP_RECEIVE_PORT 51234
const char* ip_udp = "192.168.10.61";
 
#define BUF_SIZE 200
char receiveBuffer[BUF_SIZE];
char sendBuffer[BUF_SIZE];
 
WiFiUDP Udp;
 
 
 
void udp_recv_loop(void)
{
  int packetSize = Udp.parsePacket();
  if (packetSize) 
  {
    IPAddress remoteIp = Udp.remoteIP();
    int len = Udp.read(receiveBuffer, BUF_SIZE);
    if (len > 0) {
      receiveBuffer[len] = 0;
    }
 
    char buf[BUF_SIZE];
    memset(buf,0,BUF_SIZE);
    sprintf(buf,"recv: %d|%s|%d| %s\n",packetSize,Udp.remoteIP().toString().c_str(),Udp.remotePort(),receiveBuffer);
    Serial.println(buf);
  }
}
 
 
 
void udp_send(String send_message)
{
  Udp.beginPacket(ip_udp, UDP_SEND_PORT);
  
  send_message.toCharArray(sendBuffer, send_message.length()+1);
  Serial.print("send_message:");
  Serial.println(send_message);
 
  Udp.write(sendBuffer);
  Udp.endPacket();  
}
 
 
char udp_buf[BUF_SIZE];
char* udp_print_info(void)
{  
  memset(udp_buf,0,BUF_SIZE);
  sprintf(udp_buf,"esp8266_udp(%d): %d",UDP_SEND_PORT, now_second);
 
  return udp_buf;
}
 
 
//==UDP==END
 
 
 
 
 
void setup(void) {
  
  Serial.begin(115200);  
  delay(3000);
  
//==WIFI==START
  Serial.println("WIFI !");
  WiFi.mode(WIFI_STA);
  
  WiFi.begin(ssid, password);
  Serial.print("\nConnecting to "); Serial.println(ssid);
  uint8_t i = 0;
  while (WiFi.status() != WL_CONNECTED && i++ < 600) delay(500);
  if(i == 601){
    Serial.print("Could not connect to"); Serial.println(ssid);
    while(1) delay(500);
  }
  else
  {
    Serial.print("\nConnected: "); Serial.println(ssid);
  }  
//==WIFI==END
 
//==UDP==START  
  Udp.begin(UDP_RECEIVE_PORT);
 
  Serial.print("Udp.begin..");  
//==UDP==END
 
} //setup()
 
 
void loop(void) {
 
//==UDP==START
  udp_recv_loop();
//==UDP==END  
 
 
//==TIME_LOOP==START
  loop_time();  
//==TIME_LOOP==END
 
} //loop()

 

Result

Connecting to xxxx-xxx Connected: xxxx-xxx Udp.begin..send_message:esp8266_udp(54321): 7 recv: 16|192.168.10.61|54321| Python send_data send_message:esp8266_udp(54321): 8 recv: 16|192.168.10.61|54321| Python send_data send_message:esp8266_udp(54321): 9 recv: 16|192.168.10.61|54321| Python send_data send_message:esp8266_udp(54321): 10 recv: 16|192.168.10.61|54321| Python send_data send_message:esp8266_udp(54321): 11 recv: 16|192.168.10.61|54321| Python send_data send_message:esp8266_udp(54321): 12 recv: 16|192.168.10.61|54321| Python send_data send_message:esp8266_udp(54321): 13 recv: 16|192.168.10.61|54321| Python send_data send_message:esp8266_udp(54321): 14 recv: 16|192.168.10.61|54321| Python send_data