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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.
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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.
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This is mostly similar to WiFi shield library.
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