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You can use udp.destinationIP() to tell whether the packet received was Udp.beginMulticast(WiFi.localIP(), multicast_ip_addr, port).

When listening to multicast packets, replace udp.begin(port) with Udp.beginPacketMulticast(addr, port, WiFi.localIP()). When sending a multicast packet, replace udp.beginPacket(addr, port) with WiFiUDP class supports sending and receiving multicast packets on STA interface.WiFi.printDiag(Serial) will print out some diagnostic info.WiFi.localIP() is for STA, WiFi.softAPIP() is for AP.WiFi.macAddress(mac) is for STA, WiFi.softAPmacAddress(mac) is for AP.call WiFi.softAP(ssid, password) to set up a WPA2-PSK network (password should be at least 8 characters).call WiFi.softAP(ssid) to set up an open network.WiFi.mode(m): set mode to WIFI_AP, WIFI_STA, WIFI_AP_STA or WIFI_OFF.

This is mostly similar to WiFi shield library. Other libraries (not included with the IDE).mDNS and DNS-SD responder (ESP8266mDNS library).