. When using ESP8266 hardware, a model can have only one WiFi TCP Receive, WiFi TCP Send, WiFi UDP Receive, or WiFi UDP Send block.
The maximum number of connections allowed for different ports on WiFi UDP Receive blocks and WiFi UDP Send blocks in a model is two for WiFi shield, four for MKR1000, and one for ESP8266. If the model uses External mode over Wi-Fi ® or includes a WiFi ThingSpeak Read block or WiFi ThingSpeak Write block, one UDP port is reserved for each from the maximum allowed connections.
![Library Library](/uploads/1/2/5/3/125394816/150768447.png)
Uint8t beginMulticast ( IPAddress interfaceAddr, IPAddress multicast, uint16t port ) virtual int beginPacketMulticast ( IPAddress multicastAddress, uint16t port, IPAddress interfaceAddress, int ttl = 1 ) IPAddress destinationIP uint16t localPort The WiFiUDP class supports sending and receiving multicast packets on STA interface. When sending a multicast packet, replace udp.beginPacket(addr, port) with udp.beginPacketMulticast(addr, port, WiFi.localIP). When listening to multicast packets, replace udp.begin(port) with udp.beginMulticast(WiFi.localIP, multicastipaddr, port). You can use udp.destinationIP to tell whether the packet received was sent to the multicast or unicast address.
For code samples please refer to separate section with dedicated specifically to the UDP Class.
Can Arduino with WiFi Shield send UDP message using multicast IP? Ask Question 4. I have an Arduino Uno R3 with a WiFi shield. I am using the latest WiFi library for Arduino on GitHub: https. Browse other questions tagged networking udp arduino wifi upnp or ask your own question. 4 years, 9 months ago. ESP8266 WiFi Shield Hookup Guide. And interact with the rest of the Internet world over TCP or UDP. It’s an easy (and cheap!) way to get your Arduino on the Internet! Installing the ESP8266 AT Library – Everything you should need to install the ESP8266 AT Arduino library.