Broadcast User Datagram Protocol Data Packets

Create udpport Broadcaster

Create a datagram type udpport broadcaster instance

uBroadcaster = udpport("datagram")

uBroadcaster = 
  UDPPort with properties:

         IPAddressVersion: "IPV4"
                LocalHost: "0.0.0.0"
                LocalPort: 59646
    NumDatagramsAvailable: 0

  Show all properties, functions

Set the EnableBroadcast property to allow for broadcasting.

uBroadcaster.EnableBroadcast = true;

Create udpport Receivers

Create udpport instances that receive the broadcast data. These receivers are bound to LocalPort 2020 with EnablePortSharing enabled so that multiple udpport objects can bind to the same socket. uReceiver1 is a byte type udpport instance and uReceiver2 is a datagram type udpport instance.

uReceiver1 = udpport("byte","LocalPort",2020,"EnablePortSharing",true)

uReceiver1 = 
  UDPPort with properties:

     IPAddressVersion: "IPV4"
            LocalHost: "0.0.0.0"
            LocalPort: 2020
    NumBytesAvailable: 0

  Show all properties, functions

uReceiver2 = udpport("datagram", "LocalPort",2020,"EnablePortSharing",true)

uReceiver2 = 
  UDPPort with properties:

         IPAddressVersion: "IPV4"
                LocalHost: "0.0.0.0"
                LocalPort: 2020
    NumDatagramsAvailable: 0

  Show all properties, functions

Send Broadcast Data

The broadcaster sends data to the broadcast address "192.168.255.255" and the port 2020, to which the receivers are bound. In this example, the broadcast address is "192.168.255.255", which is determined by the network address and the subnet mask. This address will be different on your computer.

Write the data 1:5, specified as uint8 data.

write(uBroadcaster,1:5,"uint8","192.168.255.255",2020);

Receive Broadcast Data

Now that the broadcaster has sent the data, the receivers receive these data packets.

Verify that the value of the NumBytesAvailable property of uReceiver1 is 5, indicating that five bytes of data was received.

uReceiver1Count = uReceiver1.NumBytesAvailable

uReceiver1Count = 5

Verify that the value of the NumDatagramsAvailable property of uReceiver2 is 1, indicating that one datagram was received.

uReceiver2Count = uReceiver2.NumDatagramsAvailable

uReceiver2Count = 1

Read the 5 bytes of data from uReceiver1.

data1 = read(uReceiver1,uReceiver1Count,"uint8")

data1 = 1×5

     1     2     3     4     5

Read the 1 datagram received on uReceiver2.

data2 = read(uReceiver2,uReceiver2Count,"uint8");

data2 is a udpport.datagram.Datagram object. View the data received.

data2.Data

ans = 1×5

     1     2     3     4     5

Clear Instances

Clear the udpport broadcaster and receiver instances.

clear uBroadcaster
clear uReceiver1
clear uReceiver2