esp8266 - multicast with python pc

https://python-dds.tistory.com/entry/python-multicast-receive-with-esp8266

https://python-dds.tistory.com/entry/python-multicast-send-with-esp8266

python - multicast send with esp8266

python - multicast receive with esp8266

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_ss;
void loop_time()
{ 
  gettimeofday(&tv, nullptr);
  static time_t lastv = 0;
  if (lastv != tv.tv_sec) {    
    lastv = tv.tv_sec;   
    now_ss = (lastv % 60);
    
    sendUDP_multicast((String)multicast_print_info());
    
  }
}
//==TIME_LOOP==END
 
 
//==MULTICAST==START
#include <WiFiUdp.h>
WiFiUDP Udp_multi;
IPAddress ipMulti(224, 1, 1, 1);
unsigned int portMulti = 5123;
#define BUF_SIZE 200
 
 
void multicast_recv_loop(){
  int noBytes = 0,msg_len =0;
 
  noBytes= Udp_multi.parsePacket();
  
  if(noBytes>0)
  {  
    if((strcmp(WiFi.localIP().toString().c_str(),Udp_multi.remoteIP().toString().c_str())))
    {
      Serial.print(Udp_multi.remoteIP());
      Serial.print(":");
      Serial.print(Udp_multi.remotePort());
      Serial.print("|");
 
      char packetBuffer[BUF_SIZE];
      msg_len=Udp_multi.read(packetBuffer,BUF_SIZE);
      
      if (msg_len>0)
      {
        packetBuffer[msg_len]=0;
        Serial.print(packetBuffer);
      }
    }
  }
}
 
 
void sendUDP_multicast(String string) {
  Serial.print("sendUDP_multicast : ");
  Serial.println(string);
  
  char msg[BUF_SIZE];
  string.toCharArray(msg,BUF_SIZE);
 
  Udp_multi.beginPacketMulticast(ipMulti, portMulti, WiFi.localIP());
  Udp_multi.write(msg);
  Udp_multi.endPacket();
}
 
 
char mcast_buf[BUF_SIZE];
char* multicast_print_info(void)
{  
  memset(mcast_buf,0,BUF_SIZE);
  sprintf(mcast_buf,"esp8266_(%d): %d",portMulti, now_ss);
 
  return mcast_buf;
}
 
//==MULTICAST==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
 
//==MULTICAST==START
  Udp_multi.beginMulticast(WiFi.localIP(), ipMulti, portMulti);
  Serial.println("Udp_multi.beginMulticast..");
//==MULTICAST==END
 
} //setup()
 
 
void loop(void) {
  
//==MULTICAST==TART
  multicast_recv_loop();
//==MULTICAST==END
 
//==TIME_LOOP==START
  loop_time();  
//==TIME_LOOP==END
 
} //loop()

 

Result

Connecting to xxxx-xxx Connected: xxxx-xxx Udp_multi.beginMulticast.. sendUDP_multicast : esp8266_(5123): 7 sendUDP_multicast : esp8266_(5123): 8 sendUDP_multicast : esp8266_(5123): 9 sendUDP_multicast : esp8266_(5123): 10 sendUDP_multicast : esp8266_(5123): 11 sendUDP_multicast : esp8266_(5123): 12 192.168.10.61:51838|python_(5123) 192.168.10.61:51838|python_(5123) sendUDP_multicast : esp8266_(5123): 13 sendUDP_multicast : esp8266_(5123): 14 192.168.10.61:45196|python_(5123) 192.168.10.61:45196|python_(5123) sendUDP_multicast : esp8266_(5123): 15 sendUDP_multicast : esp8266_(5123): 16 192.168.10.61:35352|python_(5123) 192.168.10.61:35352|python_(5123) sendUDP_multicast : esp8266_(5123): 17 sendUDP_multicast : esp8266_(5123): 18 sendUDP_multicast : esp8266_(5123): 19 sendUDP_multicast : esp8266_(5123): 20